On 11 June 2017 at 11:08, Yaniv Kaul <yk...@redhat.com> wrote: > >> I will install the o/s for each node on a SATADOM. >> Since each node will have 6x SSD for gluster storage. >> Should this be software RAID, hardware RAID or no RAID? > > I'd reckon that you should prefer HW RAID on software RAID, and some RAID on > no RAID at all, but it really depends on your budget, performance, and your > availability requirements. >
Not sure that is the best advice, given the use of Gluster+SSDs for hosting individual VMs. Typical software or hardware RAID systems are designed for use with spinning disks, and may not yield any better performance on SSDs. RAID is also not very good when I/O is highly scattered as it probably is when running multiple different VMs. So we are left with using RAID solely for availability. I think Gluster may already provide that, so adding additional software or hardware layers for RAID may just degrade performance without providing any tangible benefits. I think just defining each SSD as a single Gluster brick may provide the best performance for VMs, but my understanding of this is theoretical, so I leave it to the Gluster people to provide further insight. -- Barak Korren RHV DevOps team , RHCE, RHCi Red Hat EMEA redhat.com | TRIED. TESTED. TRUSTED. | redhat.com/trusted _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users