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Fault Tolerant RAID: Cold Spare Advised

When using fault tolerant RAID, the smart move is to have a cold spare on hand.

For example, a RAID-5 reverts to RAID-0 when a drive fails. You want that puppy rebuilt ASAP, to restore fault tolerance (failure of a 2nd drive would mean loss of the RAID).

In plain language, this means that when purchasing a unit like the 4-drive OWC Thunderbay to be used as a RAID-5 or RAID-1+0, buy a 5th spare drive and pre-test and pre-initialize it.

Spare hard drive mounted in drive sled for use as cold spare
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