HighPoint RocketRAID 2720C2 - Manual (Page 12)

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4.6 Add/Remove Spare Disks
The Add/Remove Spare command is used to assign a hard disk to act as a Spare Disk. Spare Disks
are used to automatically rebuild Redundant RAID arrays (RAID 1, 5, 6, 10, 50) in the case of disk
failure. As with creating RAID arrays, disks must be initialized before they can be used as spares.
To set a hard disk to act as a Spare Disk, use the arrow keys to select the target disk from the list of
initialized disks, and press the Enter key. To remove the Spare Disk setting from a hard disk,
highlight the spare disk, and press the Enter key.
Generally, single disks are designated to act as spares (disks that are not configured into RAID
arrays).
However, in some instances, disks that are members of RAID arrays may also be designated to act
as a spare. If the disks in question are part of a RAID array that did not utilize the full available
capacity at the time of creation, these disks may be used as spares. For example: a RAID 0 array
was created between two 200GB hard disks, but only 200GB of space (out of a grand total of
400GB), was assigned to that array. In this example, 200GB of disk space remains unallocated. This
unallocated space would allow these disks to be set as spares for a separate redundant array that falls
into the same capacity range (200GB).