BE 2012 ignoring media sets in tape library
I have an installation of BE 2012 SP1a running the latest patches which is connected to a Quantum tape library with 25 slots. The problem I'm encountering is that BE will, seemingly randomly, use tapes that are in a different media set than the one defined in the job.
For example, I have ten tapes in the library that span three media sets and three jobs over the weekend. Sometimes, but not always, a job that is supposed to use media from Set A will ignore the media in the library that belongs to Set A and will take a tape that belongs to Set B, move it to Set A, and use it for the backup. Obviously, I don't want this to happen so I'm hoping someone can point me in the right direction as to what setting(s) I need to change so that BE will never use a tape that isn't in the specified Media Set. I do have Overwrite set to 13 days (the tapes are on a two-week cycle) but this is not the problem; my issue will still happen if overwriteable tapes in the correct set are present.
Thank you very much.