Re: [ovirt-users] [Gluster-users] Replicated Glusterfs on top of ZFS

On Fri, Mar 3, 2017 at 7:00 PM, Darrell Budic <budic(a)onholyground.com&gt; wrote: > Why are you using an arbitrator if all your HW configs are identical? I’d > use a true replica 3 in this case. > > This was just GIU suggestion when I was creating the cluster it was asking for the 3 Hosts , I did not knew even that an Arbiter does not keep the data. I am not so sure if I can change the type of the glusterfs to triplicated one in the running system, probably I need to destroy whole cluster. > Also in my experience with gluster and vm hosting, the ZIL/slog degrades > write performance unless it’s a truly dedicated disk. But I have 8 spinners > backing my ZFS volumes, so trying to share a sata disk wasn’t a good zil. > If yours is dedicated SAS, keep it, if it’s SATA, try testing without it. > > We have also several huge systems running with zfs quite successful over the years. This was an idea to use zfs + glusterfs for the HA solutions. > You don’t have compression enabled on your zfs volume, and I’d recommend > enabling relatime on it. Depending on the amount of RAM in these boxes, you > probably want to limit your zfs arc size to 8G or so (1/4 total ram or > less). Gluster just works volumes hard during a rebuild, what’s the problem > you’re seeing? If it’s affecting your VMs, using shading and tuning client > & server threads can help avoid interruptions to your VMs while repairs are > running. If you really need to limit it, you can use cgroups to keep it > from hogging all the CPU, but it takes longer to heal, of course. There are > a couple older posts and blogs about it, if you go back a while. > Yes I saw that glusterfs is CPU/RAM hugry!!! 99% of all 16 cores used just for healing 500GB vm disks. It was taking almost infinity compare with nfs storage (single disk+zfs ssd cache, for sure one get an penalty for the HA:) )

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