IBM Storwize V5010 Manual page 196

Option 3: Select Assign under a specific drive class or external storage controller, as
shown in Figure 4-43.
Figure 4-43 Add storage: option 3
Both options 1 and 2 start the configuration wizard shown in Figure 4-44.
Figure 4-44 Assigning storage to storage pool
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Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1