About using a WORM scratch pool
For all supported WORM-capable drives (except the Quantum drive), the scratch pool must only contain one type of media. It is recommended that you add the most commonly used media to the scratch pool. For example, if most NetBackup jobs use standard media, put standard media in the scratch pool.
If the scratch pool contains standard media, ensure that the WORM volume pool does not run out of media to complete backup jobs.
If the WORM volume pool runs out of media, NetBackup performs the following actions:
Moves the standard media from the scratch pool into the WORM pool.
Loads the standard media into a WORM-capable drive.
Freezes the media.
NetBackup repeats this process until all of the standard media in the scratch pool is frozen.
The opposite also is true. If a standard volume pool runs out of media and the scratch pool contains WORM media, standard backups can fail because appropriate media are unavailable.