Dell PowerVault MD3000 - Manual (Page 59)

Disk Groups and Virtual Disks
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coverage for the storage array. The number and type of hot spare drives is
determined based on the number, type, and capacity of physical disks in the
storage array.
To add hot spare drive protection using automatic configuration:
1 Click the Configure tab, then click Configure Hot Spares.
2 To automatically assign hot spare drives, click Configure Hot Spares
(Automatic).
3 Click Assign.
To remove hot spare drive protection using automatic configuration:
1 Click the Configure tab, then click Configure Hot Spares.
2 Click Configure Hot Spares (Automatic).
3 Click Unassign.
4 Click OK in the dialog box.
Manually Configuring Hot Spares
You can choose to manually configure hot spare drives for the drive sets in
your storage array. With manual configuration, you assign the type and
capacity of hot spare protection for individual drives.
1 Click the Configure tab, then click Configure Hot Spares.
2 To manually assign hot spare drives, click Configure Hot Spares
(Manual).
3 In the Drive sets list, click the drive you wish to protect, then click Assign.
The Assign Hot Spares dialog box appears.
4 In the Assign Hot Spares dialog box, click the unassigned drive you want
to configure into a hot spare physical disk, then click OK.
NOTE:
When manually configuring a hot spare physical disk, you must use a
physical disk type that matches the other physical disks in the disk group.
Using a SAS physical disk to replace a SATA II physical disk (or a SATA II
physical disk to replace a SAS physical disk) is not supported. Also, the hot
spare physical disk must be as large as or larger than the largest physical disk
in the disk group.