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Some documentation polishing for log vdevs

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Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17592
This commit is contained in:
Alexander Motin
2025-08-06 13:45:45 -04:00
committed by GitHub
parent 60f714e6e2
commit 8302b6e32b
3 changed files with 12 additions and 15 deletions
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man/man4/zfs.4
+6 -5
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@@ -1723,9 +1723,10 @@ storing all written data into ZIL to not depend on regular vdev latency.
.
.It Sy zil_special_is_slog Ns = Ns Sy 1 Ns | Ns 0 Pq int
When enabled, and written blocks go to normal vdevs, treat present special
vdevs as SLOGs, storing all synchronously written data into ZIL directly.
Disabling this forces the indirect writes to preserve special vdev write
throughput and endurance, likely at the cost of normal vdev latency.
vdevs as SLOGs.
Blocks that go to the special vdevs are still written indirectly, as with
.Sy logbias Ns = Ns Sy throughput .
This parameter is ignored if an SLOG is present.
.
.It Sy zfs_initialize_value Ns = Ns Sy 16045690984833335022 Po 0xDEADBEEFDEADBEEE Pc Pq u64
Pattern written to vdev free space by
@@ -2486,8 +2487,8 @@ code for this record type.
The tunable has no effect if the feature is disabled.
.
.It Sy zfs_embedded_slog_min_ms Ns = Ns Sy 64 Pq uint
Usually, one metaslab from each normal-class vdev is dedicated for use by
the ZIL to log synchronous writes.
Usually, one metaslab from each normal and special class vdev is dedicated
for use by the ZIL to log synchronous writes.
However, if there are fewer than
.Sy zfs_embedded_slog_min_ms
metaslabs in the vdev, this functionality is disabled.