man: zfs.4: miscellaneous cleanup
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12941
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@ -348,7 +348,7 @@ When a vdev is added, target this number of metaslabs per top-level vdev.
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Default limit for metaslab size.
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.
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.It Sy zfs_vdev_max_auto_ashift Ns = Ns Sy ASHIFT_MAX Po 16 Pc Pq ulong
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Maximum ashift used when optimizing for logical -> physical sector size on new
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Maximum ashift used when optimizing for logical \[->] physical sector size on new
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top-level vdevs.
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.
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.It Sy zfs_vdev_min_auto_ashift Ns = Ns Sy ASHIFT_MIN Po 9 Pc Pq ulong
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@ -498,7 +498,7 @@ linear in kernel memory.
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Disabling can improve performance in some code paths
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at the expense of fragmented kernel memory.
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.
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.It Sy zfs_abd_scatter_max_order Ns = Ns Sy MAX_ORDER-1 Pq uint
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.It Sy zfs_abd_scatter_max_order Ns = Ns Sy MAX_ORDER\-1 Pq uint
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Maximum number of consecutive memory pages allocated in a single block for
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scatter/gather lists.
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.Pp
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@ -595,7 +595,9 @@ Under Linux, half of system memory will be used as the limit.
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Under
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.Fx ,
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the larger of
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.Sy all_system_memory - 1GB No and Sy 5/8 * all_system_memory
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.Sy all_system_memory No \- Sy 1GB
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and
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.Sy 5/8 No \(mu Sy all_system_memory
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will be used as the limit.
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This value must be at least
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.Sy 67108864 Ns B Pq 64MB .
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@ -666,7 +668,9 @@ to evict the required number of metadata buffers.
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Min size of ARC in bytes.
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.No If set to Sy 0 , arc_c_min
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will default to consuming the larger of
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.Sy 32MB No or Sy all_system_memory/32 .
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.Sy 32MB
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and
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.Sy all_system_memory No / Sy 32 .
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.
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.It Sy zfs_arc_min_prefetch_ms Ns = Ns Sy 0 Ns ms Ns Po Ns ≡ Ns 1s Pc Pq int
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Minimum time prefetched blocks are locked in the ARC.
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@ -726,10 +730,10 @@ ARC target size
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.Pq Sy arc_c
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by thresholds determined by this parameter.
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Exceeding by
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.Sy ( arc_c >> zfs_arc_overflow_shift ) * 0.5
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.Sy ( arc_c No >> Sy zfs_arc_overflow_shift ) No / Sy 2
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starts ARC reclamation process.
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If that appears insufficient, exceeding by
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.Sy ( arc_c >> zfs_arc_overflow_shift ) * 1.5
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.Sy ( arc_c No >> Sy zfs_arc_overflow_shift ) No \(mu Sy 1.5
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blocks new buffer allocation until the reclaim thread catches up.
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Started reclamation process continues till ARC size returns below the
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target size.
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@ -938,7 +942,7 @@ by the maximum number of operations per second.
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This will smoothly handle between ten times and a tenth of this number.
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.No See Sx ZFS TRANSACTION DELAY .
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.Pp
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.Sy zfs_delay_scale * zfs_dirty_data_max Em must be smaller than Sy 2^64 .
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.Sy zfs_delay_scale No \(mu Sy zfs_dirty_data_max Em must No be smaller than Sy 2^64 .
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.
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.It Sy zfs_disable_ivset_guid_check Ns = Ns Sy 0 Ns | Ns 1 Pq int
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Disables requirement for IVset GUIDs to be present and match when doing a raw
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@ -1141,11 +1145,6 @@ Maximum number of blocks freed in a single TXG.
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.It Sy zfs_max_async_dedup_frees Ns = Ns Sy 100000 Po 10^5 Pc Pq ulong
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Maximum number of dedup blocks freed in a single TXG.
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.
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.It Sy zfs_override_estimate_recordsize Ns = Ns Sy 0 Pq ulong
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If nonzero, override record size calculation for
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.Nm zfs Cm send
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estimates.
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.
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.It Sy zfs_vdev_async_read_max_active Ns = Ns Sy 3 Pq int
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Maximum asynchronous read I/O operations active to each device.
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.No See Sx ZFS I/O SCHEDULER .
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@ -1422,7 +1421,7 @@ This option is used by the test suite to track race conditions.
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.
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.It Sy zfs_livelist_condense_sync_pause Ns = Ns Sy 0 Ns | Ns 1 Pq int
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When set, the livelist condense process pauses indefinitely before
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executing the synctask -
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executing the synctask \(em
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.Fn spa_livelist_condense_sync .
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This option is used by the test suite to trigger race conditions.
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.
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@ -1531,7 +1530,7 @@ This is one of the factors used to determine the
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length of the activity check during import.
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.Pp
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The multihost write period is
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.Sy zfs_multihost_interval / leaf-vdevs .
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.Sy zfs_multihost_interval No / Sy leaf-vdevs .
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On average a multihost write will be issued for each leaf vdev
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every
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.Sy zfs_multihost_interval
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@ -1548,7 +1547,7 @@ the risk of failing to detect an active pool.
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The total activity check time is never allowed to drop below one second.
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.Pp
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On import the activity check waits a minimum amount of time determined by
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.Sy zfs_multihost_interval * zfs_multihost_import_intervals ,
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.Sy zfs_multihost_interval No \(mu Sy zfs_multihost_import_intervals ,
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or the same product computed on the host which last had the pool imported,
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whichever is greater.
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The activity check time may be further extended if the value of MMP
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@ -1573,7 +1572,7 @@ its configuration may take action such as suspending the pool or offlining a
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device.
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.Pp
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Otherwise, the pool will be suspended if
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.Sy zfs_multihost_fail_intervals * zfs_multihost_interval
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.Sy zfs_multihost_fail_intervals No \(mu Sy zfs_multihost_interval
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milliseconds pass without a successful MMP write.
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This guarantees the activity test will see MMP writes if the pool is imported.
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.Sy 1 No is equivalent to Sy 2 ;
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@ -1805,7 +1804,7 @@ remove the spill block from an existing object.
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Including unmodified copies of the spill blocks creates a backwards-compatible
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stream which will recreate a spill block if it was incorrectly removed.
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.
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.It Sy zfs_send_no_prefetch_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
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.It Sy zfs_send_no_prefetch_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq int
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The fill fraction of the
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.Nm zfs Cm send
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internal queues.
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@ -1816,7 +1815,7 @@ The maximum number of bytes allowed in
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.Nm zfs Cm send Ns 's
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internal queues.
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.
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.It Sy zfs_send_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
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.It Sy zfs_send_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq int
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The fill fraction of the
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.Nm zfs Cm send
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prefetch queue.
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@ -1827,7 +1826,7 @@ The maximum number of bytes allowed that will be prefetched by
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.Nm zfs Cm send .
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This value must be at least twice the maximum block size in use.
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.
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.It Sy zfs_recv_queue_ff Ns = Ns Sy 20 Ns ^-1 Pq int
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.It Sy zfs_recv_queue_ff Ns = Ns Sy 20 Ns ^\-1 Pq int
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The fill fraction of the
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.Nm zfs Cm receive
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queue.
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@ -2099,7 +2098,7 @@ Limit SLOG write size per commit executed with synchronous priority.
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Any writes above that will be executed with lower (asynchronous) priority
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to limit potential SLOG device abuse by single active ZIL writer.
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.
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.It Sy zfs_embedded_slog_min_ms Ns = Ns Sy 64 Pq int
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.It Sy zfs_embedded_slog_min_ms Ns = Ns Sy 64 Pq int
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Usually, one metaslab from each normal-class vdev is dedicated for use by
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the ZIL to log synchronous writes.
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However, if there are fewer than
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@ -2319,7 +2318,7 @@ This credits the transaction for "time already served",
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e.g. reading indirect blocks.
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.Pp
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The minimum time for a transaction to take is calculated as
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.Dl min_time = min( Ns Sy zfs_delay_scale No * (dirty - min) / (max - dirty), 100ms)
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.D1 min_time = min( Ns Sy zfs_delay_scale No \(mu Po Sy dirty No \- Sy min Pc / Po Sy max No \- Sy dirty Pc , 100ms)
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.Pp
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The delay has two degrees of freedom that can be adjusted via tunables.
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The percentage of dirty data at which we start to delay is defined by
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