IBM TotalStorage DS300 Best Practices Manual page 154

Figure 4-94 Spares tab
11.Select the physical drives which will be the hotspares. Then click the Add
selected drives to array button. See Figure 4-95.
Figure 4-95 Spares tab without spare drive
12.The selected drives will be moved to the Spares tab. This will be the global
hotspare drive. See Figure 4-96 on page 137.
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IBM TotalStorage DS300 and DS400 Best Practices Guide