Date: Thu, 24 Mar 2016 22:53:34 +0300 From: Alex Povolotsky <tarkhil@webmail.sub.ru> To: freebsd-stable@FreeBSD.org Subject: ZFS L2ARC not working at all Message-ID: <56F445BE.5020105@webmail.sub.ru>
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Hello
I'm benchmarking postgres on FreeBSD/ZFS, and suddenly L2ARC cache has
gone idle.
zfs-stats shows
L2 ARC Summary: (HEALTHY)
Passed Headroom: 1.45m
Tried Lock Failures: 302.35k
IO In Progress: 19
Low Memory Aborts: 3
Free on Write: 21.01k
Writes While Full: 199
R/W Clashes: 8
Bad Checksums: 0
IO Errors: 0
SPA Mismatch: 185.35m
L2 ARC Size: (Adaptive) 3.28 GiB
Header Size: 0.01% 495.03 KiB
L2 ARC Breakdown: 123.49m
Hit Ratio: 0.17% 205.20k
Miss Ratio: 99.83% 123.29m
Feeds: 31.02k
L2 ARC Buffer:
Bytes Scanned: 4.38 TiB
Buffer Iterations: 31.02k
List Iterations: 1.98m
NULL List Iterations: 69.33k
L2 ARC Writes:
Writes Sent: 100.00% 14.64k
so it's totally unused.
Here is zfs get all
https://owncloud.over.ru/public.php?service=documents&t=2XQuJExFhSdArVY
And here is sysctl vfs.zfs kstat.zfs
https://owncloud.over.ru/public.php?service=documents&t=D7S7b90RxTkncmN
Alex
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