Migration methods for image mode volumes

Several methods can be used to migrate image mode volumes into managed mode volumes.

To complete any type of migration on an image mode volume, the image mode volume must first be converted into a managed mode volume. The volume is automatically converted into a managed mode volume whenever any kind of migration activity is attempted. After the image-mode-to-managed-mode migration has occurred, the volume becomes a managed mode volume and is treated the same way as any other managed mode volume.

If the image mode disk has a partial last extent, this last extent in the image mode volume must be the first to be migrated. This migration is processed as a special case. After this special migration operation has occurred, the volume becomes a managed mode volume and is treated in the same way as any other managed mode volume. If the image mode disk does not have a partial last extent, no special processing is completed. The image mode volume is changed into a managed mode volume and is treated the same way as any other managed mode volume.

An image mode disk can also be migrated to another image mode disk. The image mode disk becomes managed while the migration is ongoing, but returns to image mode when the migration is complete.

You can complete the following types of migrations:

Migrate extents
Migrate a volume
Migrate to image mode

Note: Migration commands fail for the following reasons:

The target or source volume is offline.
A quorum disk is not defined.
Defined quorum disks are unavailable.

Correct the offline or quorum disk condition and reissue the command.

Complete the following steps to migrate volumes:

Dedicate one storage pool to image mode volumes. Ensure that the pool that you select is not a child pool.
Dedicate one storage pool to managed mode volumes.
Use the migrate volume function to move the volumes.