As I remember the original message, you have one "bad" primary DB volume,
and TSM is running on the mirror.

I believe the way to "fix" it, is to break the mirror, which you do by
deleting the bad volume.
("deleting" just disconnects the volume from TSM, it doesn't physically
remove it from the file system.)

Then TSM will be running with only one copy of that DB volume.

Wait a few minutes, then add the volume back to recreate the mirrored
environment.

When you re-establish the mirror, TSM will resync the contents by copying
the active volume (the original mirror volume) , and both copies will be
good when TSM reports they are in sync again.