[Bug 250323] OpenZFS L2ARC size shrinking over time
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Date: Thu, 17 Nov 2022 17:04:24 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250323
--- Comment #3 from crwhipp@gmail.com ---
I have observed this on:
FreeBSD 13.1-RELEASE-p3 amd64
With a 48G L2ARC configured, after 14 days of uptime on a mostly idle home
server, `zfs-stats -L` reports 18G of L2ARC:
------------------------------------------------------------------------
ZFS Subsystem Report                            Thu Nov 17 10:01:09 2022
------------------------------------------------------------------------
L2 ARC Summary: (HEALTHY)
        Low Memory Aborts:                      20
        Free on Write:                          25.03   k
        R/W Clashes:                            3
        Bad Checksums:                          0
        IO Errors:                              0
L2 ARC Size: (Adaptive)                         18.14   GiB
        Decompressed Data Size:                 30.34   GiB
        Compression Factor:                     1.67
        Header Size:                    0.15%   46.42   MiB
L2 ARC Evicts:
        Lock Retries:                           183
        Upon Reading:                           1
L2 ARC Breakdown:                               13.35   m
        Hit Ratio:                      61.47%  8.21    m
        Miss Ratio:                     38.53%  5.14    m
        Feeds:                                  1.21    m
L2 ARC Writes:
        Writes Sent:                    100.00% 71.80   k
------------------------------------------------------------------------
Rebooting restores the L2ARC size to it's correct value.
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