SLPs (duplication) not using all Tape Drives

Hello All,

I've 2 tape libraries with a total of 3 drives (one library has a single drive) and SLPs configured to first backup the data to disk and then duplicate to tape.

However I notice that though the SLPs are distributed across the 3 drives, one drive is not being used at all although backup jobs are in queue.

My environment in brief is as follows:

1. One Master cum Media server

2. One Media server

3. One SAN Media server

Each server above is configured to use the 3 drives. I'm not sure why all the 3 drives are not being utilized as this would speed up my tape backup process which is currently going into backlog till a week later.

Any help would be much appreciated.

Regards,

Adnan