In some cases, Veeam forcibly starts a new media set, even if media pool settings do not instruct Veeam to do so. It happens when a job starts, but the tape that was planned for writing data cannot be used. In this situation, Veeam takes a new tape, and starts a new media set on it. For example, the situation may be as following:
The required tape is offline. If you bring such tape online before the tape job starts, it will be used as planned.
If the media pool is scheduled to export tapes. Exporting closes the current media set and starts a new one on the next job run.
The required tape is hardware or software protected.
In library failover on the following events: library is offline and all drives are busy. When a tape library is failed over on these events, Veeam Backup & Replication starts a new media set even if the global media pools are configured to always continue one media set.
Note that if a new media set is started, scheduled or forced, the previous media set cannot be resumed.
