On Wed, Jan 26, 2011 at 10:44 AM, Matej Zary <matej.zary@xxxxxxxxx> wrote:
> Depends on quality of NAS/SAN device. Some of them are more reliable&robust
> that rest of the infrastructure (dual controllers, raid6, multipathing etc.),
> obviously they cost arm&leg. So they SHOULD not totally fail (firmware issues
> are another thing though). And in that case, even if one owns enterprise
> grade storage, backups (tape, another storage, remote site) are always must.
> Yeah, if storage fails, there will be downtime. You can still have locals
> disks on xen host. So for example you can restore most important Xen guests
> on the local disks from backups and live without live migration until the
> NAS/SAN issues are solved.
>
> Matej
> ________________________________________
Well, that's the problem. We have (had, soon to be returned) a so
called "enterprise SAN" with dual everything, but it failed miserably
during December and we ended up migrating everyone to a few older NAS
devices just to get the client's websites up again (VPS hosting). So,
just cause a SAN has dual PSU's, dual controllers, dual NIC's, dual
HEAD's, etc doesn't mean it's non-redundant.
I'm thinking of setting up 2 independent SAN's, of for that matter
even NAS clusters, and then doing something like RAID1 (mirror) on the
client nodes with the iSCSI mounts. But, I don't know if it's feasible
or worth the effort. Has anyone done something like this ?
--
Kind Regards
Rudi Ahlers
SoftDux
Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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