Draft Document for Review December 5, 2019 4:33 pm 8456ch_ConfigGUI.fm 4. In the Create Pool Pair window that is shown in Figure 11-79, select the number of arrays  to assign to the pool pair.  5. If multiple drive classes are installed on the storage system, decide how many arrays of  each drive class are required in each pool.  6. Ensure that storage type  CKD  is selected.  7. Assign a name to the pool pair. This name is used as the prefix for the pool pair ID.  8. Click  Create .  Figure 11-79 Create the CKD pool pair and assign arrays to the pool pair Important:  The CKD LSSs cannot be created in an address group that already  contains fixed-block (FB) LSSs. The address groups are identified by the first digit in the  two-digit LSS ID. Chapter 11. DS8900F Storage Management GUI  323