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Add sending large block section

Brian Behlendorf 2020-02-05 10:41:16 -08:00
parent 3f5a09e7df
commit 802ce7be9e
1 changed files with 12 additions and 2 deletions
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14
FAQ.md

@ -12,7 +12,9 @@
- [Changing /dev/ names on an existing pool](#changing-dev-names-on-an-existing-pool) - [Changing /dev/ names on an existing pool](#changing-dev-names-on-an-existing-pool)
- [The /etc/zfs/zpool.cache file](#the-etczfszpoolcache-file) - [The /etc/zfs/zpool.cache file](#the-etczfszpoolcache-file)
- [Generating a new /etc/zfs/zpool.cache file](#generating-a-new-etczfszpoolcache-file) - [Generating a new /etc/zfs/zpool.cache file](#generating-a-new-etczfszpoolcache-file)
- [hole_birth Bugs](#hole_birth-bugs) - [Sending and Receiving Streams](#sending-and-receiving-streams)
* [hole_birth Bugs](#hole_birth-bugs)
* [Sending Large Blocks](#sending-large-blocks)
- [CEPH/ZFS](#cephzfs) - [CEPH/ZFS](#cephzfs)
* [ZFS Configuration](#zfs-configuration) * [ZFS Configuration](#zfs-configuration)
* [CEPH Configuration (ceph.conf}](#ceph-configuration-cephconf) * [CEPH Configuration (ceph.conf}](#ceph-configuration-cephconf)
@ -232,8 +234,9 @@ Conversely the cache file can be disabled by setting `cachefile=none`. This is
``` ```
$ zpool set cachefile=none tank $ zpool set cachefile=none tank
``` ```
## Sending and Receiving Streams
## hole_birth Bugs ### hole_birth Bugs
The hole_birth feature has/had bugs, the result of which is that, if you do a `zfs send -i` (or `-R`, since it uses `-i`) from an affected dataset, the receiver *will not see any checksum or other errors, but will not match the source*. The hole_birth feature has/had bugs, the result of which is that, if you do a `zfs send -i` (or `-R`, since it uses `-i`) from an affected dataset, the receiver *will not see any checksum or other errors, but will not match the source*.
@ -241,6 +244,13 @@ ZoL versions 0.6.5.8 and 0.7.0-rc1 (and above) default to ignoring the faulty me
For more details, see the [[hole_birth FAQ]]. For more details, see the [[hole_birth FAQ]].
### Sending Large Blocks
When sending incremental streams which contain large blocks (>128K) the `--large-block` flag must be specified. Inconsist use of the flag between incremental sends can result in files being incorrectly zeroed when they are received. Raw encrypted send/recvs automatically imply the `--large-block` flag and are therefore unaffected.
For more details, see [issue 6224](https://github.com/zfsonlinux/zfs/issues/6224).
## CEPH/ZFS ## CEPH/ZFS
There is a lot of tuning that can be done that's dependent on the workload that is being put on CEPH/ZFS, as well as some general guidelines. Some are as follow; There is a lot of tuning that can be done that's dependent on the workload that is being put on CEPH/ZFS, as well as some general guidelines. Some are as follow;