[Gluster-users] ZFS with SSD ZIL vs XFS

[Dmitri Chebotarov]

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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