Date: Fri, 27 Nov 2015 16:24:23 +0100 From: Kai Gallasch <k@free.de> To: freebsd-fs@freebsd.org Subject: High fragmentation on zpool log Message-ID: <565875A7.6060004@free.de>
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Hi.
Today I had a look at the zpool of a server (FreeBSD 10.2, GENERIC
kernel, 100d uptime, 96GB RAM) I recently installed.
The pool has eight SAS drives in a raid 10 setup (concatenated mirror
pairs) and uses a cache and a mirrored log.
The log and cache both are on a pair of Intel SSDs.
# gpart show -l da9
=> 34 195371501 da9 GPT (93G)
34 6 - free - (3.0K)
40 16777216 1 log-BTTV5234003K100FGN (8.0G)
16777256 178594272 2 cache-BTTV5234003K100FGN (85G)
195371528 7 - free - (3.5K)
Is 85% fragmentation of the log device something to worry about?
Why does zpool list show so unrealistic values for FREE and CAP?
Is this normal?
Atached: Some output of zpool list.
Regards,
Kai.
(zpool list -v output, ommited columns: EXPANDSZ.,DEDUP,
HEALTH, ALTROOT)
NAME SIZE ALLOC FREE FRAG CAP
rpool 7.25T 440G 6.82T 4% 5%
mirror 1.81T 110G 1.71T 4% 5%
gpt/rpool-WMC160D0SVZE - - - - -
gpt/rpool-WMC160D8MJPD - - - - -
mirror 1.81T 110G 1.70T 4% 5%
gpt/rpool-WMC160D9DLL2 - - - - -
gpt/rpool-WMC160D23CWA - - - - -
mirror 1.81T 110G 1.71T 4% 5%
gpt/rpool-WMC160D94930 - - - - -
gpt/rpool-WMC160D9V5LW - - - - -
mirror 1.81T 110G 1.71T 4% 5%
gpt/rpool-WMC160D9ZV0S - - - - -
gpt/rpool-WMC160D5HFT6 - - - - -
mirror 7.94G 43.2M 7.90G 85% 0%
gpt/log-BTTV523401U4100FGN - - - - -
gpt/log-BTTV5234003K100FGN - - - - -
cache - - - - -
gpt/cache-BTTV5234003K100FGN 85.2G 142G 16.0E 0% 166%
gpt/cache-BTTV523401U4100FGN 85.2G 172G 16.0E 0% 202%
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