Hot Spare Pools

A hot spare pool is a collection of slices (hot spares) reserved by Enhanced Storage to be automatically substituted in case of a slice failure in either a submirror or RAID 5 volume. Hot spares provide increased data availability for RAID 1 (mirror) volumes and RAID 5 volumes. You can create a hot spare pool with either Enhanced Storage or the command line interface.

When errors in a submirror or RAID 5 volume occur, Enhanced Storage checks the hot spare pool for the first available hot spare whose size is equal to or greater than the size of the slice being replaced. If found, Enhanced Storage automatically resyncs the data. If a slice of adequate size is not found in the list of hot spares, the submirror or RAID 5 volume that failed is considered errored.