[Gluster-users] ZFS with SSD ZIL vs XFS

[Gandalf Corvotempesta]

Any performance report to share?

Il 10 ott 2017 8:25 PM, "Dmitri Chebotarov" <4dimach at gmail.com> ha scritto:

>
> I've had good results with using SSD as LVM cache for gluster bricks (
> http://man7.org/linux/man-pages/man7/lvmcache.7.html). I still use XFS on
> bricks.
>
>
>
> On Tue, Oct 10, 2017 at 12:27 PM, Jeff Darcy <jeff at pl.atyp.us> wrote:
>
>> On Tue, Oct 10, 2017, at 11:19 AM, Gandalf Corvotempesta wrote:
>> > Anyone made some performance comparison between XFS and ZFS with ZIL
>> > on SSD, in gluster environment ?
>> >
>> > I've tried to compare both on another SDS (LizardFS) and I haven't
>> > seen any tangible performance improvement.
>> >
>> > Is gluster different ?
>>
>> Probably not.  If there is, it would probably favor XFS.  The developers
>> at Red Hat use XFS almost exclusively.  We at Facebook have a mix, but
>> XFS is (I think) the most common.  Whatever the developers use tends to
>> become "the way local filesystems work" and code is written based on
>> that profile, so even without intention that tends to get a bit of a
>> boost.  To the extent that ZFS makes different tradeoffs - e.g. using
>> lots more memory, very different disk access patterns - it's probably
>> going to have a bit more of an "impedance mismatch" with the choices
>> Gluster itself has made.
>>
>> If you're interested in ways to benefit from a disk+SSD combo under XFS,
>> it is possible to configure XFS with a separate journal device but I
>> believe there were some bugs encountered when doing that.  Richard
>> Wareing's upcoming Dev Summit talk on Hybrid XFS might cover those, in
>> addition to his own work on using an SSD in even more interesting ways.
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>
>
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