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man: Update L2ARC documentation for depth cap and write budget fairness

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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18289
This commit is contained in:
Ameer Hamza
2026-03-05 20:26:12 +05:00
committed by Brian Behlendorf
parent b27a87f399
commit be5d36919a
2 changed files with 14 additions and 16 deletions
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man/man4/zfs.4
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@@ -108,12 +108,14 @@ and only applicable in related situations.
Seconds between L2ARC writing.
.
.It Sy l2arc_headroom Ns = Ns Sy 8 Pq u64
How far through the ARC lists to search for L2ARC cacheable content,
How far through the ARC lists to search for L2ARC cacheable content per cycle,
expressed as a multiplier of the effective write size.
ARC persistence across reboots can be achieved with persistent L2ARC
by setting this parameter to
.Sy 0 ,
allowing the full length of ARC lists to be searched for cacheable content.
Setting to
.Sy 0
disables the per-cycle headroom limit.
Scan depth is also bounded by
.Sy l2arc_ext_headroom_pct
when persistent markers are active.
.
.It Sy l2arc_headroom_boost Ns = Ns Sy 200 Ns % Pq u64
Scales