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>
next in thread | raw e-mail | index | archive | help
This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--R6g0d5tPOrX8t4sWAxN2vJF140WrSWUD0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
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
=3D> 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%
--=20
PGP-KeyID =3D 0x70654D7C4FB1F588
--R6g0d5tPOrX8t4sWAxN2vJF140WrSWUD0
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)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=NbAD
-----END PGP SIGNATURE-----
--R6g0d5tPOrX8t4sWAxN2vJF140WrSWUD0--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?565875A7.6060004>