What is a hot spare disk?
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What is a hot spare disk?
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A hot spare disk is a hard disk drive that is flagged for use in case another drive in the RAID array fails. If a hot spare disk is configured with a RAID array, and a disk in the RAID fails, the hot spare disk is immediately available for the RAID to start rebuilding the RAID data. As soon as the rebuild is completed, the RAID array becomes fully functional without affecting the performance. All the RAIDS (0, 1, 3, 5, etc.) support hot spare disks.
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