Appendix A, Media Manager Reference Topics
NetBackup and Media Manager Databases
249
Media IDs must be unique and can consist of six or less alphanumeric characters. Optical
disks each have two media IDs, one for side A and one for side B.
Media Catalog
NetBackup keeps a media catalog with information that correlates backups to the
volumes where they are stored. Each NetBackup server maintains a media catalog for the
storage units that are attached to that server.
During installation, the media catalog is created in the
install_path
\NetBackup\db\media
folder. NetBackup refers to the media catalog when
it needs a volume for a backup or restore. If the media catalog does not contain a suitable
volume, NetBackup has Media Manager assign one. In this manner, the catalog is
populated as NetBackup uses new volumes for backups.
When the retention period has ended for all backups on a volume, NetBackup deletes the
volume from the media catalog. NetBackup then sends a request to Media Manager to
unassign the volume so it is available for later reassignment.
NetBackup Catalogs
Volumes for backups of the NetBackup catalogs are a special case and do not appear in the
media catalog.
You must track the media IDs for these volumes separately so you can find them in case
the media catalog is damaged. However, they do appear in the Media Manager volume
catalog and are listed as assigned to NetBackup (they are unassigned only if you delete
them from your catalog backup settings).
Alternatively, you can locate media for catalog backups using the physical inventory
utility. It may take significant time for each tape to be mounted so its recorded label can be
read. See “Using the Physical Inventory Utility for Non-Barcoded Media” on page 290.
Device Databases
The device databases have information about the drives and robots that are in NetBackup
storage units. When you configure drives and robots, Media Manager stores this
information in its device databases. These databases are located under
install_path
\Volmgr\database
.
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