Hot-Spare

A hot spare disk is a in a system held in reserve ( not normally used ) hard disk. Turns out another plate, the hot-spare disk automatically during operation involved instead of the faulty one. The hard disk is turned off in faultless operation and is turned on only when needed by software. This serves to protect the mechanical components of the hard drive. This is particularly useful in a raid in which the data of the failed disk can be reconstructed automatically (rebuild).

During the rebuild to the hot spare disk, the performance of RAID slows down significantly. The rebuild is required for RAID -1 less time than RAID -5, since in addition the parity information must be reconstructed with RAID -5. The more hard drives in a RAID - 5 array, the longer the rebuild or the worse the performance during a failure of a hard drive.

  • Memory technology
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