Hot spare
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A hot spare is used as a failover mechanism to provide reliability in system configurations. The hot spare is active and connected as part of a working system. When a key component fails, the hot spare is switched into operation. Examples of hot spares are components such as A/V switches, computers, networked printers, and hard disks. The equipment is powered on, or considered "hot", but not actively functioning in the system. In the case of a disk drive or computer system, data is being mirrored so when the hot spare takes over, the system continues to operate with minimal or no downtime.
A hot spare disk is a disk or group of disks used to automatically or manually, depending upon the hot spare policy, replace a failing or failed disk in a RAID configuration. The hot spare disk reduces the mean time to recovery (MTTR) for the RAID redundancy group, thus reducing the probability of a second disk failure and the resultant data loss that would occur in any singly redundant RAID (e.g., RAID-1, RAID-5, RAID-10).
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