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hot spare
Last modified: Wednesday, August 08, 2007 

A backup device such as a hard disk or controller that is in a standby mode, meaning it is online and available should the primary device go offline or fail. The system would detect the failure and automatically switch to the hot spare to use as a replacement. Hot spare is commonly used in RAID arrays where additional drives are attached to the controller and left in standby mode until a failure occurs.

Compare with hot standby.
See hot swapping, also called hot plugging.

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Related Categories
Configuring Adapters

Ports and Interfaces

Related Terms
external bus

failover

hot plugging

hot potato routing

hot standby

hot swap

IEEE

IEEE 1394

load balancing

PCMCIA

RAID

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