Best practices for ZFS setup for a strictly SSD based system?

[krad]

Dont forget alignment and ashift. You may also want to test compression as
well. IF you have spare cpu cycles I would imagine the systems cpu will
handle it faster than any onboard ssd compression. Benchmarking would be of
use here though.


On 9 February 2016 at 15:54, Patrick M. Hausen <hausen at punkt.de> wrote:

> Hi, all,
>
> while there is quite a bit of documentation on how to improve ZFS
> performance
> by using a combination of rotating disks and SSDs, I have not found much
> about
> an SSD only setup.
>
> We are planning to try a hosting server with 8 SATA SSDs with ZFS. Things
> I am
> not at all sure about:
>
> *       Does the recommended limit of 6 disks for a RAIDZ2 still
>         hold? 2x 4 disks is quite a bit of overhead, could I use all 8
>         in one vdev and get away with it?
>         (The maximum of 6 recommendation is in some old Sun doc)
>
> *       Will e.g. MySQL still profit from residing on a mirror
>         instead of a RAIDZ2, even if all disks are SSDs?
>
> *       Does a separate ZIL and/or ARC cache device still
>         make sense?
>
> Any pointers or direct help greatly appreciated. Or should I take this to
> freebsd-fs@?
>
> Thanks and best regards,
> Patrick
> --
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