Tape Drives 3 & 4 Don't Get Used
We have a server running with 2 Dell TL2000 tape libraries, each with 2 LTO5 tape drives. We have the libarary expansion option installed (see pic). Until recently, backups were performed using any/all 4 of the drives. However, in the past week, we've been getting an issue where only 2 of the drives will be used (see attached pic). This means a lot of backups are being queued and/or failing when their alloted run times expires. Last week I was able to resolve by rebooting the BE server, however this morning I've done the same, and it hasn't helped! 2 of the drives are just sat doing nothing, when we have 3 backups to run! I've also tried re-initializing the 4 drives, removing and re-installing all the drives & libraries. But it hasn't helped!
We're running BackupExec 2010 R3, on Windows 2008 R2.
Any help would be greatly appreciated!