If you have running jobs that you don't want to interrupt, there is really no way to get rid of the Failed jobs until the legimate jobs are finished
On a UNIX cell Manager, check for running jobs
ps -ef | grep omni
On a Windows Cell Manager
Task Manager -> Process List
or
'tasklist'
You will see a number of runnig processes, including several 'bsm' (Backup Session Manger) processes. it is these processes that are hung, tying up your tape drives. But, there is no way to determine which 'bsm' goes with which backup, kill the wrong 'bsm' and you will kill one of the legitimate backups
All you can really to is wait for teh backups to finish, get a list of running processes again, and kill the 'bsm' processes
Then, stop and restart Data Protector, and run
UNIX Cell manager
/opt/omni/sbin/omnidbutil -clear
Windows Cell Manager
cd \Program Files\Omniback\bin
omnidbutil -clear
This command changes the status of hung sessions, internal to DP, from 'In Progress' to 'Failed', freeing up your Devices and Licenses
Since it is a Global command, ie it kills everything, care should be taken before running this command