Quote:
Originally Posted by Adrian E
With 4 identical drives in RAID5 am I likely to get away with a single drive failure and rebuild (ie is it likely any missing segments of date from a failed read will be available from elsewhere in the RAID?)
I was running mirrored with 2 drives but ran out of space, so expanded it with 2 more drives and went to RAID5 at that point....
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It's hard to say, since it depends on the capacity of the hard drives and how much reading/writing has to be done to rebuild the data. Since RAID 5 uses parity to recreate the data (rather than simple duplication), rebuilding can be very disc intensive. Also, if one drive of four identical drives has failed, there's a good chance the remaining drives could be about to fail too and working them hard to rebuild the data might just push them over the edge.
Having said all that, there's a chance the drives might last better than expected and rebuilding may well succeed, but if you want to vastly improve your chances, with 4 drive bays, you could create a RAID 10 array instead.
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Mark
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