[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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