[Users] Opinions needed: 3 node gluster replica 3 | NFS async | snapshots for consistency

[Ayal Baron]

----- Original Message -----
> I'm looking for some opinions on this configuration in an effort to increase
> write performance:
> 
> 3 storage nodes using glusterfs in replica 3, quorum.

gluster doesn't support replica 3 yet, so I'm not sure how heavily I'd rely on this.

> Ovirt storage domain via NFS

why NFS and not gluster?

> Volume set nfs.trusted-sync on
> On Ovirt, taking snapshots often enough to recover from a storage crash

Note that this would have negative write performance impact

> Using CTDB to manage NFS storage domain IP, moving it to another storage node
> when necessary
> 
> Something along the lines of EC2's data consistency model, where only
> snapshots can be considered reliable. The Ovirt added advantage would be
> memory consistency at time of snapshot as well.
> 
> Feedback appreciated, including 'you are insane for thinking this is a good
> idea' (and some supported reasoning would be great).
> 
> Thanks,
> 
> 
> 
> Steve Dainard
> IT Infrastructure Manager
> Miovision | Rethink Traffic
> 
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