Displays tape library information. To use this option, the autoload setting of the tape library must be off when the filer boots.
I'm guessing you've setup NDMP authentication between the master/media server(s) and the filer? If so then you need to scan for storage devices and be sure to select the tick box for NDMP devices and select to scan the filer(s) when prompted. The tape devices attached to the filers should then show up in Devices => Drives and you can create Storage Units for them. As long as the changer has been discovered by the media server and is working correctly, and you set up your Storage Units with the correct settings, then the media server should manage tape selection/loading and the filer should drop data straight down the fibre to the drive as an NDMP backup.
This was how I had it working with NetBackup, there may be differences with BackupExec.
Thanks for the pointer... and the winner is... you!
It turns out loop negotiation on the Quantum was responsible (was set to auto) and apparently the control path disappeared so we set that to "loop" and I was able to do the sysconfig –m with results from the filer.