One of our tape drives experienced an issue with a tape getting flagged. This caused the drive to go down, but now only 1 of our 3 tape drives are running. I believe there may be allocations on the tape drives. Can I run nbrbutil -resetall command to reset all of the drives without affecting any current backups going to disk?
I really need to get these reset and not affect any current backup running.
You need to stop all NBU activities before running nbrbutil -resetall, even disk based backups have allocations.
But you don't have to run nbrbutil -reset all, you can release a single allocation:
How to release a device allocation in NetBackup using nbrbutil without using the resetAll parameter