Hi,
Sorry for the delay in response was on vacation!!
This is now resolved i checked that drives were having device allocations got stuck/orphaned in NBU Resource Broker.
We released the allocations using the below commands;
Run the below commands on the master server;
1.) /usr/openv/netbackup/bin/admincmd/nbrbutil -resetAll
2.) /usr/openv/netbackup/bin/admincmd/nbrbutil -dump
3.) Compare MDS allocations at the bottom of the screen with actual device usage in Device Monitor or vmoprcmd output.
Release incorrect allocations with:
/usr/openv/netbackup/bin/admincmd/nbrbutil -releaseMDS <mdsAlocationKey>
4.) Restarted netbackup services on the master as well as on each media servers.
5.) To delete all device records;
/usr/openv/netbackup/bin/admincmd/nbemmcmd -deletealldevices -allrecords
6.) Rescanned the storage units in through netbackup GUI and ran the backups and they are running fine utilizing