hot spare

English

Noun

hot spare (plural hot spares)

  1. A spare device, component, or other piece of equipment which is kept powered up although not being actively used, allowing it to be immediately brought on line as a replacement should a piece of equipment fail while in active use.
    In addition to the six hard drives making up the primary RAID array, the server has three hot spares ready to automatically take over for any failed drives in the array.
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