On Wed, Jan 10, 2018 at 10:12 PM, FERNANDO FREDIANI <fernando.frediani@upx.com> wrote:

I really don't see much need of using hardware raid if you have a SSD-only environment. You will get little benefit from hardware cache memory and to guarantee the writes you may having the filesystem doing always sync operations, similar to what ZFS does. You just need to use a HBA to controll all disks ou even software RAID will do the job.

I think there are two interesting questions here:

1. Why would you want RAID? Your data is replicated already on other Gluster nodes. RAID writes will wear out the SSDs earlier and RAID 'wastes' additional space. The reason may be because you don't want the node to go down in case of a single disk malfunction. Fair - but is that the case?

2. I think HW RAID should be higher performing, but that's about it.

Fernando

On 10/01/2018 17:34, ovirt@fateknollogee.com wrote:

oVirt + Gluster (hyperconverged) RAID question:
I have 3 nodes of SuperMicro hardware, each node has 1x SATADOM (boot drive for o/s install) and 6x 1TB SSD (to be used for Gluster).
For the SSDs, is hardware or software RAID preferred or do I use an HBA?
The RedHat docs seem to suggest hardware RAID, others on the forum say HBA or software RAID.

What are other folks using?
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