Memory for disk arrays
Technology Hot Spare (hot redundancy) of a failed floppy disk Technology Hot
Spare sometimes viewed as a substitute for Hot Swap, although it is not quite
true. To realize Hot Spare need: a) RAID controller supporting regime Hot Spare
(and the regime must be included); b) At least one additional drive, which, like
the rest disco waters within the disk array to connect power supply and signal
cable. During the initialization RAID array that additional drive included as
part of the RAID, but not as active as well as a Hot Spare, ie located in a hot
standby. The failure of any of the drives within the array-RAID, RAID controller
automatically disables a defective drive, and activates reserve. The transfer of
information (recovery) also occurs in the background, without interrupting the
system. Advantages: The time during which the RAID-array is in unprotected mode
minimized. Weaknesses: requires additional drive (which most of the time
involves not in the system but consumes energy and generates heat), and after
hitting Hot Spare in the array is no longer reserve the drive, and the sooner
the better, will be required to stop the system that to replace the defective
drive. Withdrawal is clear: to use the technology in conjunction with the Hot
Spare Hot Swap.
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