From e9527d44e655fe6fda4f154b396a1e5890abc539 Mon Sep 17 00:00:00 2001 From: Richard Elling Date: Fri, 9 Oct 2020 09:29:21 -0700 Subject: [PATCH] Add zpool_influxdb command A zpool_influxdb command is introduced to ease the collection of zpool statistics into the InfluxDB time-series database. Examples are given on how to integrate with the telegraf statistics aggregator, a companion to influxdb. Finally, a grafana dashboard template is included to show how pool latency distributions can be visualized in a ZFS + telegraf + influxdb + grafana environment. Reviewed-by: Brian Behlendorf Reviewed-by: Ryan Moeller Signed-off-by: Richard Elling Closes #10786 --- cmd/Makefile.am | 1 + cmd/zpool_influxdb/Makefile.am | 11 + cmd/zpool_influxdb/README.md | 294 +++ cmd/zpool_influxdb/dashboards/README.md | 3 + .../ZFS-pool-latency-heatmaps-influxdb.json | 1667 +++++++++++++++++ cmd/zpool_influxdb/telegraf.d/README.md | 7 + .../telegraf.d/exec_zpool_influxdb.conf | 15 + .../telegraf.d/execd_zpool_influxdb.conf | 23 + cmd/zpool_influxdb/zpool_influxdb.c | 843 +++++++++ configure.ac | 2 + man/man8/Makefile.am | 3 +- man/man8/zpool_influxdb.8 | 93 + rpm/generic/zfs.spec.in | 1 + tests/runfiles/common.run | 3 + tests/zfs-tests/include/commands.cfg | 3 +- tests/zfs-tests/tests/functional/Makefile.am | 1 + .../functional/zpool_influxdb/Makefile.am | 5 + .../functional/zpool_influxdb/cleanup.ksh | 29 + .../tests/functional/zpool_influxdb/setup.ksh | 29 + .../zpool_influxdb/zpool_influxdb.ksh | 71 + 20 files changed, 3102 insertions(+), 2 deletions(-) create mode 100644 cmd/zpool_influxdb/Makefile.am create mode 100644 cmd/zpool_influxdb/README.md create mode 100644 cmd/zpool_influxdb/dashboards/README.md create mode 100644 cmd/zpool_influxdb/dashboards/grafana/ZFS-pool-latency-heatmaps-influxdb.json create mode 100644 cmd/zpool_influxdb/telegraf.d/README.md create mode 100644 cmd/zpool_influxdb/telegraf.d/exec_zpool_influxdb.conf create mode 100644 cmd/zpool_influxdb/telegraf.d/execd_zpool_influxdb.conf create mode 100644 cmd/zpool_influxdb/zpool_influxdb.c create mode 100644 man/man8/zpool_influxdb.8 create mode 100644 tests/zfs-tests/tests/functional/zpool_influxdb/Makefile.am create mode 100755 tests/zfs-tests/tests/functional/zpool_influxdb/cleanup.ksh create mode 100755 tests/zfs-tests/tests/functional/zpool_influxdb/setup.ksh create mode 100755 tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh diff --git a/cmd/Makefile.am b/cmd/Makefile.am index 88d32b1c53..d99d1dc382 100644 --- a/cmd/Makefile.am +++ b/cmd/Makefile.am @@ -1,5 +1,6 @@ SUBDIRS = zfs zpool zdb zhack zinject zstream zstreamdump ztest SUBDIRS += fsck_zfs vdev_id raidz_test zfs_ids_to_path +SUBDIRS += zpool_influxdb if USING_PYTHON SUBDIRS += arcstat arc_summary dbufstat diff --git a/cmd/zpool_influxdb/Makefile.am b/cmd/zpool_influxdb/Makefile.am new file mode 100644 index 0000000000..d87afc48f8 --- /dev/null +++ b/cmd/zpool_influxdb/Makefile.am @@ -0,0 +1,11 @@ +include $(top_srcdir)/config/Rules.am + +bin_PROGRAMS = zpool_influxdb + +zpool_influxdb_SOURCES = \ + zpool_influxdb.c + +zpool_influxdb_LDADD = \ + $(top_builddir)/lib/libspl/libspl.la \ + $(top_builddir)/lib/libnvpair/libnvpair.la \ + $(top_builddir)/lib/libzfs/libzfs.la diff --git a/cmd/zpool_influxdb/README.md b/cmd/zpool_influxdb/README.md new file mode 100644 index 0000000000..7d6c253d7d --- /dev/null +++ b/cmd/zpool_influxdb/README.md @@ -0,0 +1,294 @@ +# Influxdb Metrics for ZFS Pools +The _zpool_influxdb_ program produces +[influxdb](https://github.com/influxdata/influxdb) line protocol +compatible metrics from zpools. In the UNIX tradition, _zpool_influxdb_ +does one thing: read statistics from a pool and print them to +stdout. In many ways, this is a metrics-friendly output of +statistics normally observed via the `zpool` command. + +## Usage +When run without arguments, _zpool_influxdb_ runs once, reading data +from all imported pools, and prints to stdout. +```shell +zpool_influxdb [options] [poolname] +``` +If no poolname is specified, then all pools are sampled. + +| option | short option | description | +|---|---|---| +| --execd | -e | For use with telegraf's `execd` plugin. When [enter] is pressed, the pools are sampled. To exit, use [ctrl+D] | +| --no-histogram | -n | Do not print histogram information | +| --signed-int | -i | Use signed integer data type (default=unsigned) | +| --sum-histogram-buckets | -s | Sum histogram bucket values | +| --tags key=value[,key=value...] | -t | Add tags to data points. No tag sanity checking is performed. | +| --help | -h | Print a short usage message | + +#### Histogram Bucket Values +The histogram data collected by ZFS is stored as independent bucket values. +This works well out-of-the-box with an influxdb data source and grafana's +heatmap visualization. The influxdb query for a grafana heatmap +visualization looks like: +``` +field(disk_read) last() non_negative_derivative(1s) +``` + +Another method for storing histogram data sums the values for lower-value +buckets. For example, a latency bucket tagged "le=10" includes the values +in the bucket "le=1". +This method is often used for prometheus histograms. +The `zpool_influxdb --sum-histogram-buckets` option presents the data from ZFS +as summed values. + +## Measurements +The following measurements are collected: + +| measurement | description | zpool equivalent | +|---|---|---| +| zpool_stats | general size and data | zpool list | +| zpool_scan_stats | scrub, rebuild, and resilver statistics (omitted if no scan has been requested) | zpool status | +| zpool_vdev_stats | per-vdev statistics | zpool iostat -q | +| zpool_io_size | per-vdev I/O size histogram | zpool iostat -r | +| zpool_latency | per-vdev I/O latency histogram | zpool iostat -w | +| zpool_vdev_queue | per-vdev instantaneous queue depth | zpool iostat -q | + +### zpool_stats Description +zpool_stats contains top-level summary statistics for the pool. +Performance counters measure the I/Os to the pool's devices. + +#### zpool_stats Tags + +| label | description | +|---|---| +| name | pool name | +| path | for leaf vdevs, the pathname | +| state | pool state, as shown by _zpool status_ | +| vdev | vdev name (root = entire pool) | + +#### zpool_stats Fields + +| field | units | description | +|---|---|---| +| alloc | bytes | allocated space | +| free | bytes | unallocated space | +| size | bytes | total pool size | +| read_bytes | bytes | bytes read since pool import | +| read_errors | count | number of read errors | +| read_ops | count | number of read operations | +| write_bytes | bytes | bytes written since pool import | +| write_errors | count | number of write errors | +| write_ops | count | number of write operations | + +### zpool_scan_stats Description +Once a pool has been scrubbed, resilvered, or rebuilt, the zpool_scan_stats +contain information about the status and performance of the operation. +Otherwise, the zpool_scan_stats do not exist in the kernel, and therefore +cannot be reported by this collector. + +#### zpool_scan_stats Tags + +| label | description | +|---|---| +| name | pool name | +| function | name of the scan function running or recently completed | +| state | scan state, as shown by _zpool status_ | + +#### zpool_scan_stats Fields + +| field | units | description | +|---|---|---| +| errors | count | number of errors encountered by scan | +| examined | bytes | total data examined during scan | +| to_examine | bytes | prediction of total bytes to be scanned | +| pass_examined | bytes | data examined during current scan pass | +| issued | bytes | size of I/Os issued to disks | +| pass_issued | bytes | size of I/Os issued to disks for current pass | +| processed | bytes | data reconstructed during scan | +| to_process | bytes | total bytes to be repaired | +| rate | bytes/sec | examination rate | +| start_ts | epoch timestamp | start timestamp for scan | +| pause_ts | epoch timestamp | timestamp for a scan pause request | +| end_ts | epoch timestamp | completion timestamp for scan | +| paused_t | seconds | elapsed time while paused | +| remaining_t | seconds | estimate of time remaining for scan | + +### zpool_vdev_stats Description +The ZFS I/O (ZIO) scheduler uses five queues to schedule I/Os to each vdev. +These queues are further divided into active and pending states. +An I/O is pending prior to being issued to the vdev. An active +I/O has been issued to the vdev. The scheduler and its tunable +parameters are described at the +[ZFS documentation for ZIO Scheduler] +(https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/ZIO%20Scheduler.html) +The ZIO scheduler reports the queue depths as gauges where the value +represents an instantaneous snapshot of the queue depth at +the sample time. Therefore, it is not unusual to see all zeroes +for an idle pool. + +#### zpool_vdev_stats Tags +| label | description | +|---|---| +| name | pool name | +| vdev | vdev name (root = entire pool) | + +#### zpool_vdev_stats Fields +| field | units | description | +|---|---|---| +| sync_r_active_queue | entries | synchronous read active queue depth | +| sync_w_active_queue | entries | synchronous write active queue depth | +| async_r_active_queue | entries | asynchronous read active queue depth | +| async_w_active_queue | entries | asynchronous write active queue depth | +| async_scrub_active_queue | entries | asynchronous scrub active queue depth | +| sync_r_pend_queue | entries | synchronous read pending queue depth | +| sync_w_pend_queue | entries | synchronous write pending queue depth | +| async_r_pend_queue | entries | asynchronous read pending queue depth | +| async_w_pend_queue | entries | asynchronous write pending queue depth | +| async_scrub_pend_queue | entries | asynchronous scrub pending queue depth | + +### zpool_latency Histogram +ZFS tracks the latency of each I/O in the ZIO pipeline. This latency can +be useful for observing latency-related issues that are not easily observed +using the averaged latency statistics. + +The histogram fields show cumulative values from lowest to highest. +The largest bucket is tagged "le=+Inf", representing the total count +of I/Os by type and vdev. + +#### zpool_latency Histogram Tags +| label | description | +|---|---| +| le | bucket for histogram, latency is less than or equal to bucket value in seconds | +| name | pool name | +| path | for leaf vdevs, the device path name, otherwise omitted | +| vdev | vdev name (root = entire pool) | + +#### zpool_latency Histogram Fields +| field | units | description | +|---|---|---| +| total_read | operations | read operations of all types | +| total_write | operations | write operations of all types | +| disk_read | operations | disk read operations | +| disk_write | operations | disk write operations | +| sync_read | operations | ZIO sync reads | +| sync_write | operations | ZIO sync writes | +| async_read | operations | ZIO async reads| +| async_write | operations | ZIO async writes | +| scrub | operations | ZIO scrub/scan reads | +| trim | operations | ZIO trim (aka unmap) writes | + +### zpool_io_size Histogram +ZFS tracks I/O throughout the ZIO pipeline. The size of each I/O is used +to create a histogram of the size by I/O type and vdev. For example, a +4KiB write to mirrored pool will show a 4KiB write to the top-level vdev +(root) and a 4KiB write to each of the mirror leaf vdevs. + +The ZIO pipeline can aggregate I/O operations. For example, a contiguous +series of writes can be aggregated into a single, larger I/O to the leaf +vdev. The independent I/O operations reflect the logical operations and +the aggregated I/O operations reflect the physical operations. + +The histogram fields show cumulative values from lowest to highest. +The largest bucket is tagged "le=+Inf", representing the total count +of I/Os by type and vdev. + +Note: trim I/Os can be larger than 16MiB, but the larger sizes are +accounted in the 16MiB bucket. + +#### zpool_io_size Histogram Tags +| label | description | +|---|---| +| le | bucket for histogram, I/O size is less than or equal to bucket value in bytes | +| name | pool name | +| path | for leaf vdevs, the device path name, otherwise omitted | +| vdev | vdev name (root = entire pool) | + +#### zpool_io_size Histogram Fields +| field | units | description | +|---|---|---| +| sync_read_ind | blocks | independent sync reads | +| sync_write_ind | blocks | independent sync writes | +| async_read_ind | blocks | independent async reads | +| async_write_ind | blocks | independent async writes | +| scrub_read_ind | blocks | independent scrub/scan reads | +| trim_write_ind | blocks | independent trim (aka unmap) writes | +| sync_read_agg | blocks | aggregated sync reads | +| sync_write_agg | blocks | aggregated sync writes | +| async_read_agg | blocks | aggregated async reads | +| async_write_agg | blocks | aggregated async writes | +| scrub_read_agg | blocks | aggregated scrub/scan reads | +| trim_write_agg | blocks | aggregated trim (aka unmap) writes | + +#### About unsigned integers +Telegraf v1.6.2 and later support unsigned 64-bit integers which more +closely matches the uint64_t values used by ZFS. By default, zpool_influxdb +uses ZFS' uint64_t values and influxdb line protocol unsigned integer type. +If you are using old telegraf or influxdb where unsigned integers are not +available, use the `--signed-int` option. + +## Using _zpool_influxdb_ + +The simplest method is to use the execd input agent in telegraf. For older +versions of telegraf which lack execd, the exec input agent can be used. +For convenience, one of the sample config files below can be placed in the +telegraf config-directory (often /etc/telegraf/telegraf.d). Telegraf can +be restarted to read the config-directory files. + +### Example telegraf execd configuration +```toml +# # Read metrics from zpool_influxdb +[[inputs.execd]] +# ## default installation location for zpool_influxdb command + command = ["/usr/bin/zpool_influxdb", "--execd"] + + ## Define how the process is signaled on each collection interval. + ## Valid values are: + ## "none" : Do not signal anything. (Recommended for service inputs) + ## The process must output metrics by itself. + ## "STDIN" : Send a newline on STDIN. (Recommended for gather inputs) + ## "SIGHUP" : Send a HUP signal. Not available on Windows. (not recommended) + ## "SIGUSR1" : Send a USR1 signal. Not available on Windows. + ## "SIGUSR2" : Send a USR2 signal. Not available on Windows. + signal = "STDIN" + + ## Delay before the process is restarted after an unexpected termination + restart_delay = "10s" + + ## Data format to consume. + ## Each data format has its own unique set of configuration options, read + ## more about them here: + ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md + data_format = "influx" +``` + +### Example telegraf exec configuration +```toml +# # Read metrics from zpool_influxdb +[[inputs.exec]] +# ## default installation location for zpool_influxdb command + commands = ["/usr/bin/zpool_influxdb"] + data_format = "influx" +``` + +## Caveat Emptor +* Like the _zpool_ command, _zpool_influxdb_ takes a reader + lock on spa_config for each imported pool. If this lock blocks, + then the command will also block indefinitely and might be + unkillable. This is not a normal condition, but can occur if + there are bugs in the kernel modules. + For this reason, care should be taken: + * avoid spawning many of these commands hoping that one might + finish + * avoid frequent updates or short sample time + intervals, because the locks can interfere with the performance + of other instances of _zpool_ or _zpool_influxdb_ + +## Other collectors +There are a few other collectors for zpool statistics roaming around +the Internet. Many attempt to screen-scrape `zpool` output in various +ways. The screen-scrape method works poorly for `zpool` output because +of its human-friendly nature. Also, they suffer from the same caveats +as this implementation. This implementation is optimized for directly +collecting the metrics and is much more efficient than the screen-scrapers. + +## Feedback Encouraged +Pull requests and issues are greatly appreciated at +https://github.com/openzfs/zfs diff --git a/cmd/zpool_influxdb/dashboards/README.md b/cmd/zpool_influxdb/dashboards/README.md new file mode 100644 index 0000000000..2fdbe49834 --- /dev/null +++ b/cmd/zpool_influxdb/dashboards/README.md @@ -0,0 +1,3 @@ +### Dashboards for zpool_influxdb +This directory contains a collection of dashboards related to ZFS with data +collected from the zpool_influxdb collector. diff --git a/cmd/zpool_influxdb/dashboards/grafana/ZFS-pool-latency-heatmaps-influxdb.json b/cmd/zpool_influxdb/dashboards/grafana/ZFS-pool-latency-heatmaps-influxdb.json new file mode 100644 index 0000000000..a99f92783b --- /dev/null +++ b/cmd/zpool_influxdb/dashboards/grafana/ZFS-pool-latency-heatmaps-influxdb.json @@ -0,0 +1,1667 @@ +{ + "__inputs": [ + { + "name": "DS_MACBOOK-INFLUX", + "label": "macbook-influx", + "description": "", + "type": "datasource", + "pluginId": "influxdb", + "pluginName": "InfluxDB" + } + ], + "__requires": [ + { + "type": "grafana", + "id": "grafana", + "name": "Grafana", + "version": "6.7.3" + }, + { + "type": "panel", + "id": "heatmap", + "name": "Heatmap", + "version": "" + }, + { + "type": "datasource", + "id": "influxdb", + "name": "InfluxDB", + "version": "1.0.0" + }, + { + "type": "panel", + "id": "jdbranham-diagram-panel", + "name": "Diagram", + "version": "1.4.5" + }, + { + "type": "panel", + "id": "text", + "name": "Text", + "version": "" + } + ], + "annotations": { + "list": [ + { + "$$hashKey": "object:1627", + "builtIn": 1, + "datasource": "-- Grafana --", + "enable": true, + "hide": true, + "iconColor": "rgba(0, 211, 255, 1)", + "name": "Annotations & Alerts", + "type": "dashboard" + } + ] + }, + "description": "Top-level ZFS pool latency by ZIO type", + "editable": true, + "gnetId": null, + "graphTooltip": 1, + "id": null, + "iteration": 1590445168391, + "links": [], + "panels": [ + { + "collapsed": false, + "datasource": "${DS_MACBOOK-INFLUX}", + "gridPos": { + "h": 1, + "w": 24, + "x": 0, + "y": 0 + }, + "id": 5, + "panels": [], + "title": "Total Reads and Writes", + "type": "row" + }, + { + "cards": { + "cardPadding": null, + "cardRound": null + }, + "color": { + "cardColor": "#b4ff00", + "colorScale": "sqrt", + "colorScheme": "interpolateOranges", + "exponent": 0.5, + "mode": "spectrum" + }, + "dataFormat": "tsbuckets", + "datasource": "${DS_MACBOOK-INFLUX}", + "description": "Latency histogram for the total reads of a ZFS pool", + "fieldConfig": { + "defaults": { + "custom": {} + }, + "overrides": [] + }, + "gridPos": { + "h": 9, + "w": 12, + "x": 0, + "y": 1 + }, + "heatmap": {}, + "hideZeroBuckets": false, + "highlightCards": true, + "id": 2, + "legend": { + "show": true + }, + "reverseYBuckets": false, + "targets": [ + { + "alias": "$tag_le", + "groupBy": [ + { + "params": [ + "$__interval" + ], + "type": "time" + }, + { + "params": [ + "le" + ], + "type": "tag" + }, + { + "params": [ + "null" + ], + "type": "fill" + } + ], + "measurement": "zpool_latency", + "orderByTime": "ASC", + "policy": "default", + "refId": "A", + "resultFormat": "time_series", + "select": [ + [ + { + "params": [ + "total_read" + ], + "type": "field" + }, + { + "params": [], + "type": "last" + }, + { + "params": [ + "1s" + ], + "type": "non_negative_derivative" + } + ] + ], + "tags": [ + { + "key": "host", + "operator": "=~", + "value": "/^$hostname$/" + }, + { + "condition": "AND", + "key": "name", + "operator": "=~", + "value": "/^$poolname$/" + } + ] + } + ], + "timeFrom": null, + "timeShift": null, + "title": "Total Reads", + "tooltip": { + "show": true, + "showHistogram": true + }, + "type": "heatmap", + "xAxis": { + "show": true + }, + "xBucketNumber": null, + "xBucketSize": null, + "yAxis": { + "decimals": 0, + "format": "s", + "logBase": 1, + "max": null, + "min": null, + "show": true, + "splitFactor": null + }, + "yBucketBound": "auto", + "yBucketNumber": null, + "yBucketSize": null + }, + { + "cards": { + "cardPadding": null, + "cardRound": null + }, + "color": { + "cardColor": "#b4ff00", + "colorScale": "sqrt", + "colorScheme": "interpolateOranges", + "exponent": 0.5, + "mode": "spectrum" + }, + "dataFormat": "tsbuckets", + "datasource": "${DS_MACBOOK-INFLUX}", + "description": "Latency histogram for the total writes of a ZFS pool", + "fieldConfig": { + "defaults": { + "custom": {} + }, + "overrides": [] + }, + "gridPos": { + "h": 9, + "w": 12, + "x": 12, + "y": 1 + }, + "heatmap": {}, + "hideZeroBuckets": false, + "highlightCards": true, + "id": 3, + "legend": { + "show": true + }, + "reverseYBuckets": false, + "targets": [ + { + "alias": "$tag_le", + "groupBy": [ + { + "params": [ + "$__interval" + ], + "type": "time" + }, + { + "params": [ + "le" + ], + "type": "tag" + }, + { + "params": [ + "null" + ], + "type": "fill" + } + ], + "measurement": "zpool_latency", + "orderByTime": "ASC", + "policy": "default", + "refId": "A", + "resultFormat": "time_series", + "select": [ + [ + { + "params": [ + "total_write" + ], + "type": "field" + }, + { + "params": [], + "type": "last" + }, + { + "params": [ + "1s" + ], + "type": "non_negative_derivative" + } + ] + ], + "tags": [ + { + "key": "host", + "operator": "=~", + "value": "/^$hostname$/" + }, + { + "condition": "AND", + "key": "name", + "operator": "=~", + "value": "/^$poolname$/" + } + ] + } + ], + "timeFrom": null, + "timeShift": null, + "title": "Total Writes", + "tooltip": { + "show": true, + "showHistogram": true + }, + "type": "heatmap", + "xAxis": { + "show": true + }, + "xBucketNumber": null, + "xBucketSize": null, + "yAxis": { + "decimals": 0, + "format": "s", + "logBase": 1, + "max": null, + "min": null, + "show": true, + "splitFactor": null + }, + "yBucketBound": "auto", + "yBucketNumber": null, + "yBucketSize": null + }, + { + "collapsed": false, + "datasource": "${DS_MACBOOK-INFLUX}", + "gridPos": { + "h": 1, + "w": 24, + "x": 0, + "y": 10 + }, + "id": 8, + "panels": [], + "title": "ZIO Scheduler Queues for Read Operations", + "type": "row" + }, + { + "cards": { + "cardPadding": null, + "cardRound": null + }, + "color": { + "cardColor": "#b4ff00", + "colorScale": "sqrt", + "colorScheme": "interpolateOranges", + "exponent": 0.5, + "mode": "spectrum" + }, + "dataFormat": "tsbuckets", + "datasource": "${DS_MACBOOK-INFLUX}", + "description": "Latency histogram for the synchronous reads of a ZFS pool", + "fieldConfig": { + "defaults": { + "custom": {} + }, + "overrides": [] + }, + "gridPos": { + "h": 8, + "w": 5, + "x": 0, + "y": 11 + }, + "heatmap": {}, + "hideZeroBuckets": false, + "highlightCards": true, + "id": 6, + "legend": { + "show": false + }, + "reverseYBuckets": false, + "targets": [ + { + "alias": "$tag_le", + "groupBy": [ + { + "params": [ + "$__interval" + ], + "type": "time" + }, + { + "params": [ + "le" + ], + "type": "tag" + }, + { + "params": [ + "null" + ], + "type": "fill" + } + ], + "measurement": "zpool_latency", + "orderByTime": "ASC", + "policy": "default", + "refId": "A", + "resultFormat": "time_series", + "select": [ + [ + { + "params": [ + "sync_read" + ], + "type": "field" + }, + { + "params": [], + "type": "last" + }, + { + "params": [ + "1s" + ], + "type": "non_negative_derivative" + } + ] + ], + "tags": [ + { + "key": "host", + "operator": "=~", + "value": "/^$hostname$/" + }, + { + "condition": "AND", + "key": "name", + "operator": "=~", + "value": "/^$poolname$/" + } + ] + } + ], + "timeFrom": null, + "timeShift": null, + "title": "Sync Read Queue", + "tooltip": { + "show": true, + "showHistogram": true + }, + "type": "heatmap", + "xAxis": { + "show": true + }, + "xBucketNumber": null, + "xBucketSize": null, + "yAxis": { + "decimals": 0, + "format": "s", + "logBase": 1, + "max": null, + "min": null, + "show": true, + "splitFactor": null + }, + "yBucketBound": "auto", + "yBucketNumber": null, + "yBucketSize": null + }, + { + "cards": { + "cardPadding": null, + "cardRound": null + }, + "color": { + "cardColor": "#b4ff00", + "colorScale": "sqrt", + "colorScheme": "interpolateOranges", + "exponent": 0.5, + "mode": "spectrum" + }, + "dataFormat": "tsbuckets", + "datasource": "${DS_MACBOOK-INFLUX}", + "description": "Latency histogram for the asynchronous reads of a ZFS pool", + "fieldConfig": { + "defaults": { + "custom": {} + }, + "overrides": [] + }, + "gridPos": { + "h": 8, + "w": 5, + "x": 5, + "y": 11 + }, + "heatmap": {}, + "hideZeroBuckets": false, + "highlightCards": true, + "id": 9, + "legend": { + "show": false + }, + "reverseYBuckets": false, + "targets": [ + { + "alias": "$tag_le", + "groupBy": [ + { + "params": [ + "$__interval" + ], + "type": "time" + }, + { + "params": [ + "le" + ], + "type": "tag" + }, + { + "params": [ + "null" + ], + "type": "fill" + } + ], + "measurement": "zpool_latency", + "orderByTime": "ASC", + "policy": "default", 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"options": [], + "query": "show tag values from \"zpool_latency\" with key = \"host\"", + "refresh": 1, + "regex": "/([-a-zA-Z-0-9]+)/", + "skipUrlSync": false, + "sort": 5, + "tagValuesQuery": "", + "tags": [], + "tagsQuery": "", + "type": "query", + "useTags": false + }, + { + "allValue": null, + "current": {}, + "datasource": "${DS_MACBOOK-INFLUX}", + "definition": "show tag values from \"zpool_latency\" with key = \"name\" where \"host\" =~ /^$hostname/", + "hide": 0, + "includeAll": false, + "index": -1, + "label": null, + "multi": false, + "name": "poolname", + "options": [], + "query": "show tag values from \"zpool_latency\" with key = \"name\" where \"host\" =~ /^$hostname/", + "refresh": 1, + "regex": "", + "skipUrlSync": false, + "sort": 5, + "tagValuesQuery": "", + "tags": [], + "tagsQuery": "", + "type": "query", + "useTags": false + } + ] + }, + "time": { + "from": "2020-05-25T21:34:30.137Z", + "to": "2020-05-25T21:39:54.445Z" + }, + "timepicker": { + "refresh_intervals": [ + "10s", + "30s", + "1m", + "5m", + "15m", + "30m", + "1h", + "2h", + "1d" + ] + }, + "timezone": "", + "title": "ZFS Pool Latency Heatmaps Influxdb", + "uid": "TbB4-DkGz", + "variables": { + "list": [] + }, + "version": 2 +} \ No newline at end of file diff --git a/cmd/zpool_influxdb/telegraf.d/README.md b/cmd/zpool_influxdb/telegraf.d/README.md new file mode 100644 index 0000000000..74f411a15d --- /dev/null +++ b/cmd/zpool_influxdb/telegraf.d/README.md @@ -0,0 +1,7 @@ +This directory contains sample telegraf configurations for +adding `zpool_influxdb` as an input plugin. Depending on your +telegraf configuration, the installation can be as simple as +copying one of these to the `/etc/telegraf/telegraf.d` directory +and restarting `systemctl restart telegraf` + +See the telegraf docs for more information on input plugins. diff --git a/cmd/zpool_influxdb/telegraf.d/exec_zpool_influxdb.conf b/cmd/zpool_influxdb/telegraf.d/exec_zpool_influxdb.conf new file mode 100644 index 0000000000..e934b4e885 --- /dev/null +++ b/cmd/zpool_influxdb/telegraf.d/exec_zpool_influxdb.conf @@ -0,0 +1,15 @@ +# # Read metrics from zpool_influxdb +[[inputs.exec]] +# ## default installation location for zpool_influxdb command + commands = ["/usr/local/bin/zpool_influxdb"] +# ## Timeout for each command to complete. +# timeout = "5s" +# +# ## measurement name suffix (for separating different commands) +# name_suffix = "_mycollector" +# +# ## Data format to consume. +# ## Each data format has its own unique set of configuration options, read +# ## more about them here: +# ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md + data_format = "influx" diff --git a/cmd/zpool_influxdb/telegraf.d/execd_zpool_influxdb.conf b/cmd/zpool_influxdb/telegraf.d/execd_zpool_influxdb.conf new file mode 100644 index 0000000000..e56c51fc10 --- /dev/null +++ b/cmd/zpool_influxdb/telegraf.d/execd_zpool_influxdb.conf @@ -0,0 +1,23 @@ +# # Read metrics from zpool_influxdb +[[inputs.execd]] +# ## default installation location for zpool_influxdb command + command = ["/usr/local/bin/zpool_influxdb", "--execd"] + + ## Define how the process is signaled on each collection interval. + ## Valid values are: + ## "none" : Do not signal anything. (Recommended for service inputs) + ## The process must output metrics by itself. + ## "STDIN" : Send a newline on STDIN. (Recommended for gather inputs) + ## "SIGHUP" : Send a HUP signal. Not available on Windows. (not recommended) + ## "SIGUSR1" : Send a USR1 signal. Not available on Windows. + ## "SIGUSR2" : Send a USR2 signal. Not available on Windows. + signal = "STDIN" + + ## Delay before the process is restarted after an unexpected termination + restart_delay = "10s" + + ## Data format to consume. + ## Each data format has its own unique set of configuration options, read + ## more about them here: + ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md + data_format = "influx" diff --git a/cmd/zpool_influxdb/zpool_influxdb.c b/cmd/zpool_influxdb/zpool_influxdb.c new file mode 100644 index 0000000000..71ffcb2538 --- /dev/null +++ b/cmd/zpool_influxdb/zpool_influxdb.c @@ -0,0 +1,843 @@ +/* + * Gather top-level ZFS pool and resilver/scan statistics and print using + * influxdb line protocol + * usage: [options] [pool_name] + * where options are: + * --execd, -e run in telegraf execd input plugin mode, [CR] on + * stdin causes a sample to be printed and wait for + * the next [CR] + * --no-histograms, -n don't print histogram data (reduces cardinality + * if you don't care about histograms) + * --sum-histogram-buckets, -s sum histogram bucket values + * + * To integrate into telegraf use one of: + * 1. the `inputs.execd` plugin with the `--execd` option + * 2. the `inputs.exec` plugin to simply run with no options + * + * NOTE: libzfs is an unstable interface. YMMV. + * + * The design goals of this software include: + * + be as lightweight as possible + * + reduce the number of external dependencies as far as possible, hence + * there is no dependency on a client library for managing the metric + * collection -- info is printed, KISS + * + broken pools or kernel bugs can cause this process to hang in an + * unkillable state. For this reason, it is best to keep the damage limited + * to a small process like zpool_influxdb rather than a larger collector. + * + * Copyright 2018-2020 Richard Elling + * + * This software is dual-licensed MIT and CDDL. + * + * The MIT License (MIT) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License Version 1.0 (CDDL-1.0). + * You can obtain a copy of the license from the top-level file + * "OPENSOLARIS.LICENSE" or at . + * You may not use this file except in compliance with the license. + * + * See the License for the specific language governing permissions + * and limitations under the License. + * + * CDDL HEADER END + */ +#include +#include +#include +#include +#include +#include + +#define POOL_MEASUREMENT "zpool_stats" +#define SCAN_MEASUREMENT "zpool_scan_stats" +#define VDEV_MEASUREMENT "zpool_vdev_stats" +#define POOL_LATENCY_MEASUREMENT "zpool_latency" +#define POOL_QUEUE_MEASUREMENT "zpool_vdev_queue" +#define MIN_LAT_INDEX 10 /* minimum latency index 10 = 1024ns */ +#define POOL_IO_SIZE_MEASUREMENT "zpool_io_size" +#define MIN_SIZE_INDEX 9 /* minimum size index 9 = 512 bytes */ + +/* global options */ +int execd_mode = 0; +int no_histograms = 0; +int sum_histogram_buckets = 0; +char metric_data_type = 'u'; +uint64_t metric_value_mask = UINT64_MAX; +uint64_t timestamp = 0; +int complained_about_sync = 0; +char *tags = ""; + +typedef int (*stat_printer_f)(nvlist_t *, const char *, const char *); + +/* + * influxdb line protocol rules for escaping are important because the + * zpool name can include characters that need to be escaped + * + * caller is responsible for freeing result + */ +static char * +escape_string(char *s) +{ + char *c, *d; + char *t = (char *)malloc(ZFS_MAX_DATASET_NAME_LEN * 2); + if (t == NULL) { + fprintf(stderr, "error: cannot allocate memory\n"); + exit(1); + } + + for (c = s, d = t; *c != '\0'; c++, d++) { + switch (*c) { + case ' ': + case ',': + case '=': + case '\\': + *d++ = '\\'; + default: + *d = *c; + } + } + *d = '\0'; + return (t); +} + +/* + * print key=value where value is a uint64_t + */ +static void +print_kv(char *key, uint64_t value) +{ + printf("%s=%llu%c", key, + (u_longlong_t)value & metric_value_mask, metric_data_type); +} + +/* + * print_scan_status() prints the details as often seen in the "zpool status" + * output. However, unlike the zpool command, which is intended for humans, + * this output is suitable for long-term tracking in influxdb. + * TODO: update to include issued scan data + */ +static int +print_scan_status(nvlist_t *nvroot, const char *pool_name) +{ + uint_t c; + int64_t elapsed; + uint64_t examined, pass_exam, paused_time, paused_ts, rate; + uint64_t remaining_time; + pool_scan_stat_t *ps = NULL; + double pct_done; + char *state[DSS_NUM_STATES] = { + "none", "scanning", "finished", "canceled"}; + char *func; + + (void) nvlist_lookup_uint64_array(nvroot, + ZPOOL_CONFIG_SCAN_STATS, + (uint64_t **)&ps, &c); + + /* + * ignore if there are no stats + */ + if (ps == NULL) + return (0); + + /* + * return error if state is bogus + */ + if (ps->pss_state >= DSS_NUM_STATES || + ps->pss_func >= POOL_SCAN_FUNCS) { + if (complained_about_sync % 1000 == 0) { + fprintf(stderr, "error: cannot decode scan stats: " + "ZFS is out of sync with compiled zpool_influxdb"); + complained_about_sync++; + } + return (1); + } + + switch (ps->pss_func) { + case POOL_SCAN_NONE: + func = "none_requested"; + break; + case POOL_SCAN_SCRUB: + func = "scrub"; + break; + case POOL_SCAN_RESILVER: + func = "resilver"; + break; +#ifdef POOL_SCAN_REBUILD + case POOL_SCAN_REBUILD: + func = "rebuild"; + break; +#endif + default: + func = "scan"; + } + + /* overall progress */ + examined = ps->pss_examined ? ps->pss_examined : 1; + pct_done = 0.0; + if (ps->pss_to_examine > 0) + pct_done = 100.0 * examined / ps->pss_to_examine; + +#ifdef EZFS_SCRUB_PAUSED + paused_ts = ps->pss_pass_scrub_pause; + paused_time = ps->pss_pass_scrub_spent_paused; +#else + paused_ts = 0; + paused_time = 0; +#endif + + /* calculations for this pass */ + if (ps->pss_state == DSS_SCANNING) { + elapsed = (int64_t)time(NULL) - (int64_t)ps->pss_pass_start - + (int64_t)paused_time; + elapsed = (elapsed > 0) ? elapsed : 1; + pass_exam = ps->pss_pass_exam ? ps->pss_pass_exam : 1; + rate = pass_exam / elapsed; + rate = (rate > 0) ? rate : 1; + remaining_time = ps->pss_to_examine - examined / rate; + } else { + elapsed = + (int64_t)ps->pss_end_time - (int64_t)ps->pss_pass_start - + (int64_t)paused_time; + elapsed = (elapsed > 0) ? elapsed : 1; + pass_exam = ps->pss_pass_exam ? ps->pss_pass_exam : 1; + rate = pass_exam / elapsed; + remaining_time = 0; + } + rate = rate ? rate : 1; + + /* influxdb line protocol format: "tags metrics timestamp" */ + printf("%s%s,function=%s,name=%s,state=%s ", + SCAN_MEASUREMENT, tags, func, pool_name, state[ps->pss_state]); + print_kv("end_ts", ps->pss_end_time); + print_kv(",errors", ps->pss_errors); + print_kv(",examined", examined); + print_kv(",issued", ps->pss_issued); + print_kv(",pass_examined", pass_exam); + print_kv(",pass_issued", ps->pss_pass_issued); + print_kv(",paused_ts", paused_ts); + print_kv(",paused_t", paused_time); + printf(",pct_done=%.2f", pct_done); + print_kv(",processed", ps->pss_processed); + print_kv(",rate", rate); + print_kv(",remaining_t", remaining_time); + print_kv(",start_ts", ps->pss_start_time); + print_kv(",to_examine", ps->pss_to_examine); + print_kv(",to_process", ps->pss_to_process); + printf(" %llu\n", (u_longlong_t)timestamp); + return (0); +} + +/* + * get a vdev name that corresponds to the top-level vdev names + * printed by `zpool status` + */ +static char * +get_vdev_name(nvlist_t *nvroot, const char *parent_name) +{ + static char vdev_name[256]; + char *vdev_type = NULL; + uint64_t vdev_id = 0; + + if (nvlist_lookup_string(nvroot, ZPOOL_CONFIG_TYPE, + &vdev_type) != 0) { + vdev_type = "unknown"; + } + if (nvlist_lookup_uint64( + nvroot, ZPOOL_CONFIG_ID, &vdev_id) != 0) { + vdev_id = UINT64_MAX; + } + if (parent_name == NULL) { + (void) snprintf(vdev_name, sizeof (vdev_name), "%s", + vdev_type); + } else { + (void) snprintf(vdev_name, sizeof (vdev_name), + "%s/%s-%llu", + parent_name, vdev_type, (u_longlong_t)vdev_id); + } + return (vdev_name); +} + +/* + * get a string suitable for an influxdb tag that describes this vdev + * + * By default only the vdev hierarchical name is shown, separated by '/' + * If the vdev has an associated path, which is typical of leaf vdevs, + * then the path is added. + * It would be nice to have the devid instead of the path, but under + * Linux we cannot be sure a devid will exist and we'd rather have + * something than nothing, so we'll use path instead. + */ +static char * +get_vdev_desc(nvlist_t *nvroot, const char *parent_name) +{ + static char vdev_desc[2 * MAXPATHLEN]; + char *vdev_type = NULL; + uint64_t vdev_id = 0; + char vdev_value[MAXPATHLEN]; + char *vdev_path = NULL; + char *s, *t; + + if (nvlist_lookup_string(nvroot, ZPOOL_CONFIG_TYPE, &vdev_type) != 0) { + vdev_type = "unknown"; + } + if (nvlist_lookup_uint64(nvroot, ZPOOL_CONFIG_ID, &vdev_id) != 0) { + vdev_id = UINT64_MAX; + } + if (nvlist_lookup_string( + nvroot, ZPOOL_CONFIG_PATH, &vdev_path) != 0) { + vdev_path = NULL; + } + + if (parent_name == NULL) { + s = escape_string(vdev_type); + (void) snprintf(vdev_value, sizeof (vdev_value), "vdev=%s", s); + free(s); + } else { + s = escape_string((char *)parent_name); + t = escape_string(vdev_type); + (void) snprintf(vdev_value, sizeof (vdev_value), + "vdev=%s/%s-%llu", s, t, (u_longlong_t)vdev_id); + free(s); + free(t); + } + if (vdev_path == NULL) { + (void) snprintf(vdev_desc, sizeof (vdev_desc), "%s", + vdev_value); + } else { + s = escape_string(vdev_path); + (void) snprintf(vdev_desc, sizeof (vdev_desc), "path=%s,%s", + s, vdev_value); + free(s); + } + return (vdev_desc); +} + +/* + * vdev summary stats are a combination of the data shown by + * `zpool status` and `zpool list -v` + */ +static int +print_summary_stats(nvlist_t *nvroot, const char *pool_name, + const char *parent_name) +{ + uint_t c; + vdev_stat_t *vs; + char *vdev_desc = NULL; + vdev_desc = get_vdev_desc(nvroot, parent_name); + if (nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS, + (uint64_t **)&vs, &c) != 0) { + return (1); + } + printf("%s%s,name=%s,state=%s,%s ", POOL_MEASUREMENT, tags, + pool_name, zpool_state_to_name((vdev_state_t)vs->vs_state, + (vdev_aux_t)vs->vs_aux), vdev_desc); + print_kv("alloc", vs->vs_alloc); + print_kv(",free", vs->vs_space - vs->vs_alloc); + print_kv(",size", vs->vs_space); + print_kv(",read_bytes", vs->vs_bytes[ZIO_TYPE_READ]); + print_kv(",read_errors", vs->vs_read_errors); + print_kv(",read_ops", vs->vs_ops[ZIO_TYPE_READ]); + print_kv(",write_bytes", vs->vs_bytes[ZIO_TYPE_WRITE]); + print_kv(",write_errors", vs->vs_write_errors); + print_kv(",write_ops", vs->vs_ops[ZIO_TYPE_WRITE]); + print_kv(",checksum_errors", vs->vs_checksum_errors); + print_kv(",fragmentation", vs->vs_fragmentation); + printf(" %llu\n", (u_longlong_t)timestamp); + return (0); +} + +/* + * vdev latency stats are histograms stored as nvlist arrays of uint64. + * Latency stats include the ZIO scheduler classes plus lower-level + * vdev latencies. + * + * In many cases, the top-level "root" view obscures the underlying + * top-level vdev operations. For example, if a pool has a log, special, + * or cache device, then each can behave very differently. It is useful + * to see how each is responding. + */ +static int +print_vdev_latency_stats(nvlist_t *nvroot, const char *pool_name, + const char *parent_name) +{ + uint_t c, end = 0; + nvlist_t *nv_ex; + char *vdev_desc = NULL; + + /* short_names become part of the metric name and are influxdb-ready */ + struct lat_lookup { + char *name; + char *short_name; + uint64_t sum; + uint64_t *array; + }; + struct lat_lookup lat_type[] = { + {ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO, "total_read", 0}, + {ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO, "total_write", 0}, + {ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO, "disk_read", 0}, + {ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO, "disk_write", 0}, + {ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO, "sync_read", 0}, + {ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO, "sync_write", 0}, + {ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO, "async_read", 0}, + {ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO, "async_write", 0}, + {ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO, "scrub", 0}, +#ifdef ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO + {ZPOOL_CONFIG_VDEV_TRIM_LAT_HISTO, "trim", 0}, +#endif + {NULL, NULL} + }; + + if (nvlist_lookup_nvlist(nvroot, + ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) { + return (6); + } + + vdev_desc = get_vdev_desc(nvroot, parent_name); + + for (int i = 0; lat_type[i].name; i++) { + if (nvlist_lookup_uint64_array(nv_ex, + lat_type[i].name, &lat_type[i].array, &c) != 0) { + fprintf(stderr, "error: can't get %s\n", + lat_type[i].name); + return (3); + } + /* end count count, all of the arrays are the same size */ + end = c - 1; + } + + for (int bucket = 0; bucket <= end; bucket++) { + if (bucket < MIN_LAT_INDEX) { + /* don't print, but collect the sum */ + for (int i = 0; lat_type[i].name; i++) { + lat_type[i].sum += lat_type[i].array[bucket]; + } + continue; + } + if (bucket < end) { + printf("%s%s,le=%0.6f,name=%s,%s ", + POOL_LATENCY_MEASUREMENT, tags, + (float)(1ULL << bucket) * 1e-9, + pool_name, vdev_desc); + } else { + printf("%s%s,le=+Inf,name=%s,%s ", + POOL_LATENCY_MEASUREMENT, tags, pool_name, + vdev_desc); + } + for (int i = 0; lat_type[i].name; i++) { + if (bucket <= MIN_LAT_INDEX || sum_histogram_buckets) { + lat_type[i].sum += lat_type[i].array[bucket]; + } else { + lat_type[i].sum = lat_type[i].array[bucket]; + } + print_kv(lat_type[i].short_name, lat_type[i].sum); + if (lat_type[i + 1].name != NULL) { + printf(","); + } + } + printf(" %llu\n", (u_longlong_t)timestamp); + } + return (0); +} + +/* + * vdev request size stats are histograms stored as nvlist arrays of uint64. + * Request size stats include the ZIO scheduler classes plus lower-level + * vdev sizes. Both independent (ind) and aggregated (agg) sizes are reported. + * + * In many cases, the top-level "root" view obscures the underlying + * top-level vdev operations. For example, if a pool has a log, special, + * or cache device, then each can behave very differently. It is useful + * to see how each is responding. + */ +static int +print_vdev_size_stats(nvlist_t *nvroot, const char *pool_name, + const char *parent_name) +{ + uint_t c, end = 0; + nvlist_t *nv_ex; + char *vdev_desc = NULL; + + /* short_names become the field name */ + struct size_lookup { + char *name; + char *short_name; + uint64_t sum; + uint64_t *array; + }; + struct size_lookup size_type[] = { + {ZPOOL_CONFIG_VDEV_SYNC_IND_R_HISTO, "sync_read_ind"}, + {ZPOOL_CONFIG_VDEV_SYNC_IND_W_HISTO, "sync_write_ind"}, + {ZPOOL_CONFIG_VDEV_ASYNC_IND_R_HISTO, "async_read_ind"}, + {ZPOOL_CONFIG_VDEV_ASYNC_IND_W_HISTO, "async_write_ind"}, + {ZPOOL_CONFIG_VDEV_IND_SCRUB_HISTO, "scrub_read_ind"}, + {ZPOOL_CONFIG_VDEV_SYNC_AGG_R_HISTO, "sync_read_agg"}, + {ZPOOL_CONFIG_VDEV_SYNC_AGG_W_HISTO, "sync_write_agg"}, + {ZPOOL_CONFIG_VDEV_ASYNC_AGG_R_HISTO, "async_read_agg"}, + {ZPOOL_CONFIG_VDEV_ASYNC_AGG_W_HISTO, "async_write_agg"}, + {ZPOOL_CONFIG_VDEV_AGG_SCRUB_HISTO, "scrub_read_agg"}, +#ifdef ZPOOL_CONFIG_VDEV_IND_TRIM_HISTO + {ZPOOL_CONFIG_VDEV_IND_TRIM_HISTO, "trim_write_ind"}, + {ZPOOL_CONFIG_VDEV_AGG_TRIM_HISTO, "trim_write_agg"}, +#endif + {NULL, NULL} + }; + + if (nvlist_lookup_nvlist(nvroot, + ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) { + return (6); + } + + vdev_desc = get_vdev_desc(nvroot, parent_name); + + for (int i = 0; size_type[i].name; i++) { + if (nvlist_lookup_uint64_array(nv_ex, size_type[i].name, + &size_type[i].array, &c) != 0) { + fprintf(stderr, "error: can't get %s\n", + size_type[i].name); + return (3); + } + /* end count count, all of the arrays are the same size */ + end = c - 1; + } + + for (int bucket = 0; bucket <= end; bucket++) { + if (bucket < MIN_SIZE_INDEX) { + /* don't print, but collect the sum */ + for (int i = 0; size_type[i].name; i++) { + size_type[i].sum += size_type[i].array[bucket]; + } + continue; + } + + if (bucket < end) { + printf("%s%s,le=%llu,name=%s,%s ", + POOL_IO_SIZE_MEASUREMENT, tags, 1ULL << bucket, + pool_name, vdev_desc); + } else { + printf("%s%s,le=+Inf,name=%s,%s ", + POOL_IO_SIZE_MEASUREMENT, tags, pool_name, + vdev_desc); + } + for (int i = 0; size_type[i].name; i++) { + if (bucket <= MIN_SIZE_INDEX || sum_histogram_buckets) { + size_type[i].sum += size_type[i].array[bucket]; + } else { + size_type[i].sum = size_type[i].array[bucket]; + } + print_kv(size_type[i].short_name, size_type[i].sum); + if (size_type[i + 1].name != NULL) { + printf(","); + } + } + printf(" %llu\n", (u_longlong_t)timestamp); + } + return (0); +} + +/* + * ZIO scheduler queue stats are stored as gauges. This is unfortunate + * because the values can change very rapidly and any point-in-time + * value will quickly be obsoleted. It is also not easy to downsample. + * Thus only the top-level queue stats might be beneficial... maybe. + */ +static int +print_queue_stats(nvlist_t *nvroot, const char *pool_name, + const char *parent_name) +{ + nvlist_t *nv_ex; + uint64_t value; + + /* short_names are used for the field name */ + struct queue_lookup { + char *name; + char *short_name; + }; + struct queue_lookup queue_type[] = { + {ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE, "sync_r_active"}, + {ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE, "sync_w_active"}, + {ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE, "async_r_active"}, + {ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE, "async_w_active"}, + {ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE, "async_scrub_active"}, + {ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE, "sync_r_pend"}, + {ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE, "sync_w_pend"}, + {ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE, "async_r_pend"}, + {ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE, "async_w_pend"}, + {ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE, "async_scrub_pend"}, + {NULL, NULL} + }; + + if (nvlist_lookup_nvlist(nvroot, + ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) { + return (6); + } + + printf("%s%s,name=%s,%s ", POOL_QUEUE_MEASUREMENT, tags, pool_name, + get_vdev_desc(nvroot, parent_name)); + for (int i = 0; queue_type[i].name; i++) { + if (nvlist_lookup_uint64(nv_ex, + queue_type[i].name, &value) != 0) { + fprintf(stderr, "error: can't get %s\n", + queue_type[i].name); + return (3); + } + print_kv(queue_type[i].short_name, value); + if (queue_type[i + 1].name != NULL) { + printf(","); + } + } + printf(" %llu\n", (u_longlong_t)timestamp); + return (0); +} + +/* + * top-level vdev stats are at the pool level + */ +static int +print_top_level_vdev_stats(nvlist_t *nvroot, const char *pool_name) +{ + nvlist_t *nv_ex; + uint64_t value; + + /* short_names become part of the metric name */ + struct queue_lookup { + char *name; + char *short_name; + }; + struct queue_lookup queue_type[] = { + {ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE, "sync_r_active_queue"}, + {ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE, "sync_w_active_queue"}, + {ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE, "async_r_active_queue"}, + {ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE, "async_w_active_queue"}, + {ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE, "async_scrub_active_queue"}, + {ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE, "sync_r_pend_queue"}, + {ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE, "sync_w_pend_queue"}, + {ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE, "async_r_pend_queue"}, + {ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE, "async_w_pend_queue"}, + {ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE, "async_scrub_pend_queue"}, + {NULL, NULL} + }; + + if (nvlist_lookup_nvlist(nvroot, + ZPOOL_CONFIG_VDEV_STATS_EX, &nv_ex) != 0) { + return (6); + } + + printf("%s%s,name=%s,vdev=root ", VDEV_MEASUREMENT, tags, + pool_name); + for (int i = 0; queue_type[i].name; i++) { + if (nvlist_lookup_uint64(nv_ex, + queue_type[i].name, &value) != 0) { + fprintf(stderr, "error: can't get %s\n", + queue_type[i].name); + return (3); + } + if (i > 0) + printf(","); + print_kv(queue_type[i].short_name, value); + } + + printf(" %llu\n", (u_longlong_t)timestamp); + return (0); +} + +/* + * recursive stats printer + */ +static int +print_recursive_stats(stat_printer_f func, nvlist_t *nvroot, + const char *pool_name, const char *parent_name, int descend) +{ + uint_t c, children; + nvlist_t **child; + char vdev_name[256]; + int err; + + err = func(nvroot, pool_name, parent_name); + if (err) + return (err); + + if (descend && nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, + &child, &children) == 0) { + (void) strncpy(vdev_name, get_vdev_name(nvroot, parent_name), + sizeof (vdev_name)); + vdev_name[sizeof (vdev_name) - 1] = '\0'; + + for (c = 0; c < children; c++) { + print_recursive_stats(func, child[c], pool_name, + vdev_name, descend); + } + } + return (0); +} + +/* + * call-back to print the stats from the pool config + * + * Note: if the pool is broken, this can hang indefinitely and perhaps in an + * unkillable state. + */ +static int +print_stats(zpool_handle_t *zhp, void *data) +{ + uint_t c; + int err; + boolean_t missing; + nvlist_t *config, *nvroot; + vdev_stat_t *vs; + struct timespec tv; + char *pool_name; + + /* if not this pool return quickly */ + if (data && + strncmp(data, zhp->zpool_name, ZFS_MAX_DATASET_NAME_LEN) != 0) { + zpool_close(zhp); + return (0); + } + + if (zpool_refresh_stats(zhp, &missing) != 0) { + zpool_close(zhp); + return (1); + } + + config = zpool_get_config(zhp, NULL); + if (clock_gettime(CLOCK_REALTIME, &tv) != 0) + timestamp = (uint64_t)time(NULL) * 1000000000; + else + timestamp = + ((uint64_t)tv.tv_sec * 1000000000) + (uint64_t)tv.tv_nsec; + + if (nvlist_lookup_nvlist( + config, ZPOOL_CONFIG_VDEV_TREE, &nvroot) != 0) { + zpool_close(zhp); + return (2); + } + if (nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS, + (uint64_t **)&vs, &c) != 0) { + zpool_close(zhp); + return (3); + } + + pool_name = escape_string(zhp->zpool_name); + err = print_recursive_stats(print_summary_stats, nvroot, + pool_name, NULL, 1); + /* if any of these return an error, skip the rest */ + if (err == 0) + err = print_top_level_vdev_stats(nvroot, pool_name); + + if (no_histograms == 0) { + if (err == 0) + err = print_recursive_stats(print_vdev_latency_stats, nvroot, + pool_name, NULL, 1); + if (err == 0) + err = print_recursive_stats(print_vdev_size_stats, nvroot, + pool_name, NULL, 1); + if (err == 0) + err = print_recursive_stats(print_queue_stats, nvroot, + pool_name, NULL, 0); + } + if (err == 0) + err = print_scan_status(nvroot, pool_name); + + free(pool_name); + zpool_close(zhp); + return (err); +} + +static void +usage(char *name) +{ + fprintf(stderr, "usage: %s [--execd][--no-histograms]" + "[--sum-histogram-buckets] [--signed-int] [poolname]\n", name); + exit(EXIT_FAILURE); +} + +int +main(int argc, char *argv[]) +{ + int opt; + int ret = 8; + char *line = NULL; + size_t len, tagslen = 0; + struct option long_options[] = { + {"execd", no_argument, NULL, 'e'}, + {"help", no_argument, NULL, 'h'}, + {"no-histograms", no_argument, NULL, 'n'}, + {"signed-int", no_argument, NULL, 'i'}, + {"sum-histogram-buckets", no_argument, NULL, 's'}, + {"tags", required_argument, NULL, 't'}, + {0, 0, 0, 0} + }; + while ((opt = getopt_long( + argc, argv, "ehinst:", long_options, NULL)) != -1) { + switch (opt) { + case 'e': + execd_mode = 1; + break; + case 'i': + metric_data_type = 'i'; + metric_value_mask = INT64_MAX; + break; + case 'n': + no_histograms = 1; + break; + case 's': + sum_histogram_buckets = 1; + break; + case 't': + tagslen = strlen(optarg) + 2; + tags = calloc(tagslen, 1); + if (tags == NULL) { + fprintf(stderr, + "error: cannot allocate memory " + "for tags\n"); + exit(1); + } + (void) snprintf(tags, tagslen, ",%s", optarg); + break; + default: + usage(argv[0]); + } + } + + libzfs_handle_t *g_zfs; + if ((g_zfs = libzfs_init()) == NULL) { + fprintf(stderr, + "error: cannot initialize libzfs. " + "Is the zfs module loaded or zrepl running?\n"); + exit(EXIT_FAILURE); + } + if (execd_mode == 0) { + ret = zpool_iter(g_zfs, print_stats, argv[optind]); + return (ret); + } + while (getline(&line, &len, stdin) != -1) { + ret = zpool_iter(g_zfs, print_stats, argv[optind]); + fflush(stdout); + } + return (ret); +} diff --git a/configure.ac b/configure.ac index cd822abc03..47f0f2f50d 100644 --- a/configure.ac +++ b/configure.ac @@ -86,6 +86,7 @@ AC_CONFIG_FILES([ cmd/ztest/Makefile cmd/zvol_id/Makefile cmd/zvol_wait/Makefile + cmd/zpool_influxdb/Makefile contrib/Makefile contrib/bash_completion.d/Makefile contrib/bpftrace/Makefile @@ -394,6 +395,7 @@ AC_CONFIG_FILES([ tests/zfs-tests/tests/functional/vdev_zaps/Makefile tests/zfs-tests/tests/functional/write_dirs/Makefile tests/zfs-tests/tests/functional/xattr/Makefile + tests/zfs-tests/tests/functional/zpool_influxdb/Makefile tests/zfs-tests/tests/functional/zvol/Makefile tests/zfs-tests/tests/functional/zvol/zvol_ENOSPC/Makefile tests/zfs-tests/tests/functional/zvol/zvol_cli/Makefile diff --git a/man/man8/Makefile.am b/man/man8/Makefile.am index 07f6aefa68..602645180b 100644 --- a/man/man8/Makefile.am +++ b/man/man8/Makefile.am @@ -82,7 +82,8 @@ dist_man_MANS = \ zpool-upgrade.8 \ zpool-wait.8 \ zstream.8 \ - zstreamdump.8 + zstreamdump.8 \ + zpool_influxdb.8 nodist_man_MANS = \ zed.8 \ diff --git a/man/man8/zpool_influxdb.8 b/man/man8/zpool_influxdb.8 new file mode 100644 index 0000000000..bd899dbe90 --- /dev/null +++ b/man/man8/zpool_influxdb.8 @@ -0,0 +1,93 @@ +.\" +.\" CDDL HEADER START +.\" +.\" The contents of this file are subject to the terms of the +.\" Common Development and Distribution License (the "License"). +.\" You may not use this file except in compliance with the License. +.\" +.\" You can obtain a copy of the license at +.\" https://opensource.org/licenses/CDDL-1.0 +.\" See the License for the specific language governing permissions +.\" and limitations under the License. +.\" +.\" When distributing Covered Code, include this CDDL HEADER in each +.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. +.\" If applicable, add the following below this CDDL HEADER, with the +.\" fields enclosed by brackets "[]" replaced with your own identifying +.\" information: Portions Copyright [yyyy] [name of copyright owner] +.\" +.\" CDDL HEADER END +.\" +.\" +.\" Copyright 2020 Richard Elling +.\" .Dd June 14, 2020 +.TH zpool_influxdb 8 +.SH NAME +zpool_influxdb \- collect zpool statistics in influxdb line protocol format +.SH SYNOPSIS +.LP +.nf +\fBzpool_influxdb\fR [--execd] [--no-histogram] [--sum-histogram-buckets] +[--tags key=value] [pool] +\fBzpool_influxdb\fR --help +.fi +.SH DESCRIPTION +The \fBzpool_influxdb\fR command produces influxdb line protocol compatible +metrics from zpools. Like the \fBzpool\fR command, \fBzpool_influxdb\fR +reads the current pool status and statistics. Unlike the \fBzpool\fR +command which is intended for humans, \fBzpool_influxdb\fR formats the +output in influxdb line protocol. The expected use is as a plugin to a +metrics collector or aggregator, such as telegraf. + +By default, \fBzpool_influxdb\fR prints pool metrics and status in the +influxdb line protocol format. All pools are printed, similar to +the \fBzpool status\fR command. Providing a pool name restricts the +output to the named pool. + +Like the \fBzpool\fR command, \fBzpool_influxdb\fR uses internal data +structures that can change over time as new ZFS releases are made. +Therefore, the \fBzpool_influxdb\fR command must be compiled against the +ZFS source. It is expected that later releases of ZFS includes compatible +\fBzpool_influxdb\fR and \fBzpool\fR commands. + +.SH OPTIONS +.TP +\fB\--execd\fR, \fB-e\fR +Run in daemon mode compatible with telegraf`s \fBexecd\fR plugin. +In this mode, the pools are sampled every time there is a [return] on stdin. +Once a sample printed, \fBzpool_influxdb\fR waits for another [return]. +When run on a terminal, use [ctrl+C] to exit. +.TP +\fB\--no-histogram\fR, \fB-n\fR +Do not print latency and I/O size histograms. This can reduce the total +amount of data, but one should consider the value brought by the insights +that latency and I/O size distributions provide. The resulting values +are suitable for graphing with grafana's heatmap plugin. +.TP +\fB--sum-histogram-buckets\fR, \fB-s\fR +Accumulates bucket values. By default, the values are not accumulated and +the raw data appears as shown by \fBzpool iostat\fR. This works well for +grafana's heatmap plugin. Summing the buckets produces output similar to +prometheus histograms. +.TP +\fB--tags\fR, \fB-t\fR +Adds specified tags to the tag set. Tags are key=value pairs and multiple +tags are separated by commas. No sanity checking is performed. +See the InfluxDB Line Protocol format documentation for details on escaping +special characters used in tags. +.TP +\fB\--help\fR, \fB\-h\fR +Print a usage summary. + +.SH SEE ALSO +.LP +\fBzpool-status\fR(8) +\fBzpool-iostat\fR(8) +.PP +Influxdb https://github.com/influxdata/influxdb +.PP +Telegraf https://github.com/influxdata/telegraf +.PP +Grafana https://grafana.com +.PP +Prometheus https://prometheus.io diff --git a/rpm/generic/zfs.spec.in b/rpm/generic/zfs.spec.in index 86e983718e..1ce47e1a17 100644 --- a/rpm/generic/zfs.spec.in +++ b/rpm/generic/zfs.spec.in @@ -439,6 +439,7 @@ systemctl --system daemon-reload >/dev/null || true %{_bindir}/raidz_test %{_bindir}/zgenhostid %{_bindir}/zvol_wait +%{_bindir}/zpool_influxdb # Optional Python 2/3 scripts %{_bindir}/arc_summary %{_bindir}/arcstat diff --git a/tests/runfiles/common.run b/tests/runfiles/common.run index 228bd5eac5..d935f5b042 100644 --- a/tests/runfiles/common.run +++ b/tests/runfiles/common.run @@ -905,3 +905,6 @@ tests = ['l2arc_arcstats_pos', 'l2arc_mfuonly_pos', 'persist_l2arc_006_pos', 'persist_l2arc_007_pos', 'persist_l2arc_008_pos'] tags = ['functional', 'l2arc'] +[tests/functional/zpool_influxdb] +tests = ['zpool_influxdb'] +tags = ['functional', 'zpool_influxdb'] diff --git a/tests/zfs-tests/include/commands.cfg b/tests/zfs-tests/include/commands.cfg index 5a507b94ab..21d1950e74 100644 --- a/tests/zfs-tests/include/commands.cfg +++ b/tests/zfs-tests/include/commands.cfg @@ -188,7 +188,8 @@ export ZFS_FILES='zdb zgenhostid zstream zstreamdump - zfs_ids_to_path' + zfs_ids_to_path + zpool_influxdb' export ZFSTEST_FILES='badsend btree_test diff --git a/tests/zfs-tests/tests/functional/Makefile.am b/tests/zfs-tests/tests/functional/Makefile.am index 6438898e40..3a5b7b0b97 100644 --- a/tests/zfs-tests/tests/functional/Makefile.am +++ b/tests/zfs-tests/tests/functional/Makefile.am @@ -82,6 +82,7 @@ SUBDIRS = \ vdev_zaps \ write_dirs \ xattr \ + zpool_influxdb \ zvol if BUILD_LINUX diff --git a/tests/zfs-tests/tests/functional/zpool_influxdb/Makefile.am b/tests/zfs-tests/tests/functional/zpool_influxdb/Makefile.am new file mode 100644 index 0000000000..36d08a41a9 --- /dev/null +++ b/tests/zfs-tests/tests/functional/zpool_influxdb/Makefile.am @@ -0,0 +1,5 @@ +pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/zpool_influxdb +dist_pkgdata_SCRIPTS = \ + setup.ksh \ + cleanup.ksh \ + zpool_influxdb.ksh diff --git a/tests/zfs-tests/tests/functional/zpool_influxdb/cleanup.ksh b/tests/zfs-tests/tests/functional/zpool_influxdb/cleanup.ksh new file mode 100755 index 0000000000..a8cd2e4b61 --- /dev/null +++ b/tests/zfs-tests/tests/functional/zpool_influxdb/cleanup.ksh @@ -0,0 +1,29 @@ +#!/bin/ksh -p +# +# CDDL HEADER START +# +# The contents of this file are subject to the terms of the +# Common Development and Distribution License (the "License"). +# You may not use this file except in compliance with the License. +# +# You can obtain a copy of the license at +# https://opensource.org/licenses/CDDL-1.0 +# See the License for the specific language governing permissions +# and limitations under the License. +# +# When distributing Covered Code, include this CDDL HEADER in each +# file and include the License file at usr/src/OPENSOLARIS.LICENSE. +# If applicable, add the following below this CDDL HEADER, with the +# fields enclosed by brackets "[]" replaced with your own identifying +# information: Portions Copyright [yyyy] [name of copyright owner] +# +# CDDL HEADER END +# + +# +# Copyright 2020 Richard Elling +# + +. $STF_SUITE/include/libtest.shlib + +default_cleanup diff --git a/tests/zfs-tests/tests/functional/zpool_influxdb/setup.ksh b/tests/zfs-tests/tests/functional/zpool_influxdb/setup.ksh new file mode 100755 index 0000000000..43f2c8c20b --- /dev/null +++ b/tests/zfs-tests/tests/functional/zpool_influxdb/setup.ksh @@ -0,0 +1,29 @@ +#!/bin/ksh -p +# +# CDDL HEADER START +# +# The contents of this file are subject to the terms of the +# Common Development and Distribution License (the "License"). +# You may not use this file except in compliance with the License. +# +# You can obtain a copy of the license at +# https://opensource.org/licenses/CDDL-1.0 +# See the License for the specific language governing permissions +# and limitations under the License. +# +# When distributing Covered Code, include this CDDL HEADER in each +# file and include the License file at usr/src/OPENSOLARIS.LICENSE. +# If applicable, add the following below this CDDL HEADER, with the +# fields enclosed by brackets "[]" replaced with your own identifying +# information: Portions Copyright [yyyy] [name of copyright owner] +# +# CDDL HEADER END +# + +# +# Copyright 2020 Richard Elling +# + +. $STF_SUITE/include/libtest.shlib + +default_raidz_setup $DISKS diff --git a/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh b/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh new file mode 100755 index 0000000000..495a4a38b7 --- /dev/null +++ b/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh @@ -0,0 +1,71 @@ +#!/bin/ksh -p +# +# CDDL HEADER START +# +# The contents of this file are subject to the terms of the +# Common Development and Distribution License (the "License"). +# You may not use this file except in compliance with the License. +# +# You can obtain a copy of the license at +# https://opensource.org/licenses/CDDL-1.0 +# See the License for the specific language governing permissions +# and limitations under the License. +# +# When distributing Covered Code, include this CDDL HEADER in each +# file and include the License file at usr/src/OPENSOLARIS.LICENSE. +# If applicable, add the following below this CDDL HEADER, with the +# fields enclosed by brackets "[]" replaced with your own identifying +# information: Portions Copyright [yyyy] [name of copyright owner] +# +# CDDL HEADER END +# + +# +# Copyright 2020 Richard Elling +# + +. $STF_SUITE/include/libtest.shlib + +typeset tmpfile=$TEST_BASE_DIR/zpool_influxdb.out.$$ +function cleanup +{ + if [[ -f $tmpfile ]]; then + rm -f $tmpfile + fi +} +log_onexit cleanup + +log_assert "zpool_influxdb gathers statistics" + +if ! is_global_zone ; then + TESTPOOL=${TESTPOOL%%/*} +fi + +function check_for +{ + grep "^${1}," $tmpfile >/dev/null 2>/dev/null + if [ $? -ne 0 ]; then + log_fail "cannot find stats for $1" + fi +} + +# by default, all stats and histograms for all pools +log_must zpool_influxdb > $tmpfile + +STATS=" +zpool_io_size +zpool_latency +zpool_stats +zpool_vdev_queue +zpool_vdev_stats +" +for stat in $STATS; do + check_for $stat +done + +# scan stats aren't expected to be there until after a scan has started +zpool scrub $TESTPOOL +zpool_influxdb > $tmpfile +check_for zpool_scan_stats + +log_pass "zpool_influxdb gathers statistics"