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Explanation: When a job is run on a media server installed with pre NetBackup 6.0 software, there are some situations where the job starts, but the drives designated for the job are busy or otherwise unavailable, causing the job to fail. In this case, the NetBackup master server stops using that drive for a period of time (several minutes), and returns this error for jobs requesting that drive.
Recommended Action: Make sure all of the drives in the storage unit are up and available for use. Clean all drives that need cleaning.