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man: Update L2ARC tunables for DWPD and parallel writes

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Add l2arc_dwpd_limit, remove l2arc_write_boost, update related tunables.

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18093
This commit is contained in:
Ameer Hamza
2025-12-30 00:24:35 +05:00
committed by Brian Behlendorf
parent d1f290f1ea
commit 48d3f7fac9
2 changed files with 35 additions and 11 deletions
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man/man7/zpoolconcepts.7
+14
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@@ -426,10 +426,24 @@ This can be changed with
The cache device header
.Pq Em 512 B
is updated even if no metadata structures are written.
.Pp
L2ARC operates in one of two modes depending on total cache capacity.
When total L2ARC capacity is less than twice
.Sy arc_c_max ,
L2ARC uses exclusive caching,
writing buffers to cache as they are evicted from ARC.
When total capacity is at least twice
.Sy arc_c_max ,
L2ARC switches to inclusive caching with persistent markers
that track scan positions,
attempting to duplicate ARC contents as much as write throughput allows.
Setting
.Sy l2arc_headroom Ns = Ns Sy 0
will result in scanning the full-length ARC lists for cacheable content to be
written in L2ARC (persistent ARC).
In inclusive mode, markers progress toward the head across iterations,
naturally covering the full list.
.Pp
If a cache device is added with
.Nm zpool Cm add ,
its label and header will be overwritten and its contents will not be