Hot spare disks

A hot spare disk should always be available on your storage system in the event that an active disk fails.

Hot spare disks are disks held in reserve globally, in case an active disk fails.

Hot spare disks in a storage system do not belong to any particular volume. In fact, any disk in the storage system that has not yet been assigned to a RAID group or aggregate (and has not been marked bad) is treated as a hot spare.

If the storage system has multiple volumes, any available spare can replace a failed disk on any aggregate, as long as the following conditions are true:

• The spare is as large or larger than the disk it replaces.
• The replacement disk resides on the same storage system as the failed disk.