Re: thoughts on moving to shared storage for VM hosting
On Mon, 30 Jun 2008, Maarten Vink wrote:
> I'd suggest choosing a platform that supports RAID-6 instead of RAID-5,
> and use that, optionally with a hot spare. You might even skip the hot
> spare, since you can lose up to two active disks in a RAID-6 array.
> If you choose RAID-5 with a 12-disk array, sooner or later Murphy will
> catch up with you. The chance of a second drive in your RAID-5 array
> failing while it's doing a rebuild to the hot spare are larger than you
> might think.
And bit-rot is a big deal with RAID-5 (as well as two-disk RAID1), RAID-6
mitigates that as well... you'd still need to run a RAID full read and
repair any bad sectors every once in a while, but murphy will need to work
harder to cause data loss.
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot