IBM V7000 Introduction And Implementation Manual page 325

The image mode copy of the volumes on the original external storage system is deleted and
the associated MDisks from the storage pool are removed and the status of those MDisks
then becomes unmanaged. They are now available to the system as unmanaged disks as
shown in Figure 7-27.
Figure 7-27 Disks are returned as unmanaged MDisks
When all migrations are complete, you can un-map IBM Flex System V7000 Storage Node on
the external storage system, then un-zone and remove the older storage system from IBM
Flex System V7000 Storage Node.
For more information about the IBM Flex System V7000 Storage Node migration function, see
Chapter 10, "Volume mirroring and migration" on page 447.
After the migration is Finalized, the Migration Pool used for the migration remain as a Storage
Pool on the system and is empty. It can be deleted at this time or it can simply be left unused.
As the volume name of the migrated disk is automatically determined by the Storage
Migration Process, and if you did not rename the disk during the Wizard, it is now a good time
to rename the volume. For an example of how to rename a volume, see 7.2.7, "Renaming the
volume" on page 309.
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Chapter 7. Storage Migration Wizard