On Thu, Feb 23, 2017 at 3:57 AM, Gandalf Corvotempesta < gandalf.corvotempesta at gmail.com> wrote:> How much RAM is suggested for gluster with ZFS (no dedup) ? > > Are 16GB enough with an SSD L2ARC? > > 8gb for the arc, 8gb for gluster and OS. >That's what my systems run though each of my nodes only has @3TB of storage. Current tests among zfs used as VM storage seems to be that l2arc sits almost wholly unused though. I removed mine since it had such a very low hit rate.> _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://lists.gluster.org/mailman/listinfo/gluster-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20170223/158aef21/attachment.html>
Gandalf Corvotempesta
2017-Feb-23 11:49 UTC
[Gluster-users] Gluster and ZFS: how much RAM?
2017-02-23 11:53 GMT+01:00 David Gossage <dgossage at carouselchecks.com>:> That's what my systems run though each of my nodes only has @3TB of storage. > Current tests among zfs used as VM storage seems to be that l2arc sits > almost wholly unused though. I removed mine since it had such a very low > hit rate.I have to use an SSD for ZIL, the same SSD could also be used for L2ARC. I don't think would give me any advantage to remove that at all. Anyway, is possible to use the same ZIL partition for multiple bricks/zfs vdevs ? (i'll use one vdev per brick, but I would like to share the same SSD with all vdevs without creating multiple partitions in the same SSD)
What are you looking at to determine the hit rate? l2_hits & l2_misses, or hits & misses? I?ve got a small cluster with 16G boxes and I?m about on those numbers for the l2arc, my bigger group with dedicated storage servers uses more, but I?d like to do more analysis on it and see how effective it is.> On Feb 23, 2017, at 4:53 AM, David Gossage <dgossage at carouselchecks.com> wrote: > > On Thu, Feb 23, 2017 at 3:57 AM, Gandalf Corvotempesta <gandalf.corvotempesta at gmail.com <mailto:gandalf.corvotempesta at gmail.com>> wrote: > How much RAM is suggested for gluster with ZFS (no dedup) ? > > Are 16GB enough with an SSD L2ARC? > > 8gb for the arc, 8gb for gluster and OS. > > That's what my systems run though each of my nodes only has @3TB of storage. Current tests among zfs used as VM storage seems to be that l2arc sits almost wholly unused though. I removed mine since it had such a very low hit rate. > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> > http://lists.gluster.org/mailman/listinfo/gluster-users <http://lists.gluster.org/mailman/listinfo/gluster-users> > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://lists.gluster.org/mailman/listinfo/gluster-users-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20170223/4a8874a9/attachment.html>