An IBM System Storage N series can be configured such that one or more “hot spare” disk
drives are available. When that is the case, a hot spare is immediately substituted for a failed
disk whenever the N series product is in degraded mode. The availability of multiple hot
spares allows for the automatic replacement of subsequent failed disks.
The reconstruction process can be assigned a low priority (and take a long time to complete)
if incoming service requests need to be handled quickly as a disk is being rebuilt. Or it can be
assigned a high priority (and be completed quickly) if sluggish service request ...
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