IBM Midrange System DS4000 Series Hardware Manual page 206

This automatic hot spare creation function created one hot spare drive for every 30 disk
drives of the same type (FDE/FC/SATA).
Manual assignment
To perform manual hot spare assignment, follow these steps:
1. To manually define a hot spare drive, select, from the Setup view, Configure Storage
Subsystem  Configure hot spare drives  View/change current hot spare
coverage.
You can also select, from the Physical view, the specific non-assigned drive you want to
set up as a hot spare, right-click it, and select Hot Spare Coverage, or, from the top
menu, select Drive  Hot Spare Coverage,as shown in Figure 4-52.
Figure 4-52 Hot Spare Coverage
2. This opens the Hot Spare Drive Options window, as shown in Figure 4-50, but this time
with the option Manually assign individual drives selected by default. Click OK and the
unassigned drive is defined as a hot spare.
If any array on the DS5000 storage subsystem contains larger drives than the drive you
have chosen, a warning message appears notifying you that not all arrays are protected
by the hot spare drive.
Remember to create hot spares for each type of disk drive. Use the push buttons in the
Physical view to show each type of drives, as shown in Figure 4-53.
Figure 4-53 FC drives protected with hot spare
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IBM Midrange System Storage Hardware Guide