Date: Mon, 10 Mar 2014 18:40:52 +0100 From: Adrian Gschwend <ml-ktk@netlabs.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: Reoccuring ZFS performance problems Message-ID: <531DF924.5030109@netlabs.org> In-Reply-To: <D0C1B46B015243048E05FE9E87EB5A38@multiplay.co.uk> References: <531DF0DD.8070809@netlabs.org> <D0C1B46B015243048E05FE9E87EB5A38@multiplay.co.uk>
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On 10.03.14 18:31, Steven Hartland wrote:
> Looks like you may be out of IOP/s but just incase, are you using TRIM
> at all?
> sysctl -a |grep trim
vfs.zfs.vdev.trim_on_init: 1
vfs.zfs.vdev.trim_max_pending: 64
vfs.zfs.vdev.trim_max_bytes: 2147483648
vfs.zfs.trim.enabled: 1
vfs.zfs.trim.max_interval: 1
vfs.zfs.trim.timeout: 30
vfs.zfs.trim.txg_delay: 32
kstat.zfs.misc.zio_trim.bytes: 0
kstat.zfs.misc.zio_trim.success: 0
kstat.zfs.misc.zio_trim.unsupported: 115
kstat.zfs.misc.zio_trim.failed: 0
so looks like trim is enabled
> If you are what does "gstat -d" show?
It looks like finally my MySQL process finished and now the system is
back to completely fine:
dT: 1.010s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps
ms/d %busy Name
10 203 0 0 0.0 192 1674 38.8 0 0
0.0 95.2| vtbd0
0 0 0 0 0.0 0 0 0.0 0 0
0.0 0.0| vtbd0p1
0 0 0 0 0.0 0 0 0.0 0 0
0.0 0.0| vtbd0p2
10 203 0 0 0.0 192 1674 39.0 0 0
0.0 95.5| vtbd0p3
0 0 0 0 0.0 0 0 0.0 0 0
0.0 0.0| cd0
0 0 0 0 0.0 0 0 0.0 0 0
0.0 0.0| gptid/e402ecce-89ca-11e2-a867-3264262b9894
0 0 0 0 0.0 0 0 0.0 0 0
0.0 0.0| gptid/e4112d88-89ca-11e2-a867-3264262b9894
I restarted MySQL now, curious how long it will take.
> You also mention your using mysql, have you applied the standard tuning
> for mysql on ZFS?
At first I didn't so anything special with MySQL, during the process I
redid the MySQL ZFS with a new record size:
# zfs get recordsize tank/storage/data/db/data
NAME PROPERTY VALUE SOURCE
tank/storage/data/db/data recordsize 16K local
regards
Adrian
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