Hi!
> Am 09.02.2016 um 17:32 schrieb Alan Somers <asom...@freebsd.org>:
> [...]
> http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/
>
>>
>> * Will e.g. MySQL still profit from residing on a mirror
>> instead of a RAIDZ2, even if all disks are SSDs?
>
> Yes, because a mirrored vdev has as many read IOPs as all of its disks
> combined. So a RAID10 of SSDs will have many read IOPs indeed.
Ah … yes. Now I remember :)
> […]
> Will MySQL access its files in fixed-size records? If so, you can set
> the recsize filesystem property accordingly. If not, you should
> probably leave recsize at the default. If you profile MySQL's disk
> accesses and determine that there is a dominant recordsize, then go
> ahead and set ZFS's recsize to the next highest power of two.
>
> As usual, disable atime.
We already knew these. But thanks a lot for the vdev setup
hints! So it will be a mirror for OS and DB and a 4+2 raidz2
for the rest of the data.
Our MySQL zvols are currently set up like this:
DB files:
recordsize=16k
atime=off
primarycache=metadata
InnoDB log files:
recordsize=128k
(rest inherited from above)
Kind regards,
Patrick
--
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