Thinking of moving from BackupExec x to 2010?
If so, read here to start with:
Then read this!
It took half an hour of needless KB searching before finding article 346347, which fixed the problem instantly (and even then, only because I decided to Bing "CALL DBO.GETMYPARTITION", thinking that it was obscure enough to return just a few hits).
Also keep in mind that after following article 318321 BE didn’t actually migrate B2D devices to the new server so I had to create those from scratch even though BEMig told me it had (not a big issue but niggly).