Allow media overwrite property

This property overrides NetBackup's overwrite protection for specific media types. Normally, NetBackup does not overwrite certain media types. To disable overwrite protection, place a check in the check box of one or more of the listed media formats.

For example, place a check in the CPIO check box to permit NetBackup to overwrite the cpio format.

By default, NetBackup does not overwrite any of the formats on removable media, and logs an error if an overwrite attempt occurs. This format recognition requires that the first variable length block on a media be less than or equal to 32 kilobytes.

The following media formats on removable media can be selected to be overwritten:

When ANSI is enabled, ANSI labeled media can be overwritten.
When AOS/VS is enabled, AOS/VS media can be overwritten. (Data General AOS/VS backup format.)
When CPIO is enabled, CPIO media can be overwritten.
When DBR is enabled, DBR media can be overwritten. (The DBR backup format is no longer used.)
Remote Storage MTF1 media format. When MTF1 is enabled, Remote Storage MTF1 media format can be overwritten.
When TAR is enabled, TAR media can be overwritten.
When MTF is enabled, MTF media can be overwritten. With only MTF checked, all other MTF formats can be overwritten. (The exception is Backup Exec MTF (BE-MTF1) and Remote Storage MTF (RS-MTF1) media formats, which are not overwritten.
When BE-MTF1 is enabled, Backup Exec MTF media can be overwritten.

If media contains one of the protected formats and media overwrites are not permitted, NetBackup takes the following actions:

If the volume has not been previously assigned for a backup
- Sets the volume's state to FROZEN
- Selects a different volume
- Logs an error
If the volume is in the NetBackup media catalog and was previously selected for backups
- Sets the volume's state to SUSPENDED
- Aborts the requested backup
- Logs an error
If the volume is mounted for a backup of the NetBackup catalog, the backup is aborted and an error is logged. The error indicates the volume cannot be overwritten.
If the volume is mounted to restore files or list the media contents, NetBackup aborts the request and logs an error. The error indicates that the volume does not have a NetBackup format.