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Figure 9-37 shows creating a cache partition. 

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Figure 9-38 shows an example of the successful creation in the upper half of the window. The lower half of the window shows an example in which the user failed to observe the amount of free space that was available in CP0. 

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Notice that redefining the size of existing partitions in an operational TS7700T might create unexpected load peak in the overall premigration queue, which causes host write throttling to be applied to the partitions. 

For example, consider an example in which a tape attached partition is downsized, and becomes instantly overcommitted. In this example, the TS7700T premigration queue is flooded by volumes that got dislodged by the size of this cache partition becoming smaller. Partition readapts to the new size by migrating volumes in excess to physical tape. 

