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  3. April 2008

RE: hot spare disk

If you're going to have the 'spare' drive spinning anyway and your
controller supports RAID6, go that route and gain that extra level of
protection.

After all, in RAID5 if you have a second drive fail between the time a
first drive fails & parity is rebuilt using the spare you crash. Under
RAID6 with two failures you drop to unprotected but stay up.

The only thing having a warm spare does for a RAID5 set is save you the
trip into the data center to plug the drive in. Well, it also wastes
electricity.


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