I have and issue with backup only running to my OST de dup disk. So I have tried to run the same job to a tape and it starts fine . No recent changes were made on the environment.
What would be the possible cause. Help us with your suggestions.
What OST device are you using?
Are you using multiple LSUs/containers on that OST? Does the issue affect all of the LSUs/containers?
What version of BE? is it fully patched?