IBM V7000 Introduction And Implementation Manual page 382

Important: After you delete the pool, all the data in the pool is lost except for the image
mode MDisks. Their volume definition is deleted, yet the data on the imported MDisk
remains untouched.
After you delete a pool, all associated volumes and their host mappings are removed.
Figure 8-64 shows that the MDisks in the Migration Pool are returned to the
MDisk group.
Figure 8-64 The image mode MDisk returns as Not in a Pool
All the managed or image mode MDisks in the pool return to a status of unmanaged after the
pool is deleted. If an MDisk pool is deleted, all the array mode MDisks (Internal disks) in the
pool are removed and all the member drives return to
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Not in a Pool
Candidate
status.