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When you change a failing disk to a spare disk, confirm the following to get
the spare disk to function normally:
The capacity of the spare disk is equal to or greater than that of the failing
disk.
The rotational speed of the spare disk is equal to or faster than that of the
failing disk.
Therefore, if a large-capacity disk is defined as a spare disk, it can cover all
the disks of a high-speed drive. However, if your disk array unit contains disks
of different capacities or different rotational speeds, you should define a spare
disk matching the capacity and rotational speed of each disk in order to clarify
disk management.
Up to 2 spare disks can be installed for each disk enclosure. Up to 16 spare
disks can be installed for the entire disk array unit.
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