We are running Arcserve 11.5 SP4 on a 2003 server SP1, destination is an overland Neo 2000.
Our weekly backups are split into 3 jobs.
Job 1 only uses 1 tape.
Job 2 group has access to use the rest of the slots in the first magazine (slots 4-14).
Job 3 group has access to use all of the slots in the second magazine (slots 15-28).
The backups have been running fine for a while, but a few months back Job 2 started using the tape in the 2nd slot in it's group (slot 5) as it's first tape and then if necessary running over to slot 2.
This wasn't a big issue, it doesn't usually run over so I was inserting the first tape for the backup job into slot 3.
Recently though Job 3 has started doing something similar, but instead of starting on slot 16 it starts on slot 25 and then runs through 28, begins again on 15 and then finishes on slot 22 or 23!
We're at a loss as to why this would be.
All of the weekly tapes are formatted on a Thursday and ejected once that is done.
The daily backup which use slots 1 & 2 don't have this same problem, but the way things are going I am expecting this to start any time soon!
Any suggestions anyone can make would be most appreciated.