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If you try to migrate one DPM disk (containing inactive protection groups) to another, you will get the following warning:

WARNING: Migration of inactive protection group is not supported

Somewhat more serious is the fact that after migration completes, the script will fail to remove the source disk from the DPM pool. This step is crucial, though, as it ensures that the original disk is not used again for new protection groups.

Simple fix: Delete inacvtive protection from the disk, remove it manually.