Dell PowerVault MD3220 Owner's Manual page 112

• If there are secure disk groups and security capable disk groups in the
storage array, the hot spare physical disk must match the security
capability of the disk group.
• Hot spare physical disks must have capacities equal to or larger than the
used capacity on the physical disks that they are protecting.
• The availability of enclosure loss protection for a disk group depends on
the location of the physical disks that comprise the disk group. To make
sure that enclosure loss protection is not affected, you must replace a failed
physical disk to initiate the copyback process. See "Enclosure Loss
Protection" on page 115.
CAUTION:
Recovery Guru procedures to correct the problem before you try to unassign the
physical disk. You cannot assign a hot spare physical disk if it is in use (taking
over for a failed physical disk).
To assign or unassign hot spare physical disks:
1 In the AMW, select the Physical tab.
2 Select one or more physical disks.
3 Perform one of these actions:
• Select Physical disk Hot Spare Coverage.
• Right-click the physical disk and select Hot Spare Coverage from the
pop-up menu.
The Hot Spare Physical Disk Options window is displayed.
4 Select the appropriate option, you can select:
• View/change current hot spare coverage—to review hot spare coverage
and to assign or unassign hot spare physical disks, if necessary. See
step 5.
• Automatically assign physical disks— to create hot spare physical disks
automatically for the best hot spare coverage using available physical
disks.
• Manually assign individual physical disks—to create hot spare physical
disks out of the selected physical disks on the Physical tab.
• Manually unassign individual physical disks—to unassign the selected
hot spare physical disks on the Physical tab. See step 12.
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Configuration: Disk Groups and Virtual Disks
If a hot spare physical disk does not have Optimal status, follow the