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Update documentation of l2arc_mfuonly

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with regard to evicted_l2_eligibile_mru. Even if l2arc_mfuonly is
enabled, this is not reflected in evicted_l2_eligible_mru as this
information is useful for deciding whether to toggle l2arc_mfuonly
depending on the current workload.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #10945
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George Amanakis 2020-09-21 12:26:24 -04:00 committed by GitHub
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man/man5/zfs-module-parameters.5
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@ -218,7 +218,10 @@ If accessed again they are counted as MRU and the \fBl2arc_mru_asize\fR arcstat
will not be 0. The ARC status of L2ARC buffers when they were first cached in will not be 0. The ARC status of L2ARC buffers when they were first cached in
L2ARC can be seen in the \fBl2arc_mru_asize\fR, \fBl2arc_mfu_asize\fR and L2ARC can be seen in the \fBl2arc_mru_asize\fR, \fBl2arc_mfu_asize\fR and
\fBl2arc_prefetch_asize\fR arcstats when importing the pool or onlining a cache \fBl2arc_prefetch_asize\fR arcstats when importing the pool or onlining a cache
device if persistent L2ARC is enabled. device if persistent L2ARC is enabled. The \fBevicted_l2_eligible_mru\fR
arcstat does not take into account if this option is enabled as the information
provided by the evicted_l2_eligible_* arcstats can be used to decide if
toggling this option is appropriate for the current workload.
.sp .sp
Use \fB0\fR for no (default) and \fB1\fR for yes. Use \fB0\fR for no (default) and \fB1\fR for yes.
.RE .RE