TMF Operations and Recovery Guide (G06.24+)

The TMF Catalog
HP NonStop TMF Operations and Recovery Guide—522417-002
6-14
Removing Tape Volumes from the Catalog
•
Released: not to be used for file recovery or for receiving new dumps
•
Bad: physically damaged, not usable for file recovery or receiving new dumps
Initially, you define a tape as a scratch volume when you add it to the TMF catalog
using the ADD TAPEMEDIA command. The tape automatically becomes assigned
when it receives an audit dump or online dump. The tape is automatically changed
back to scratch (or to released, if you specified RELEASED ON in an ALTER
CATALOG command) when the TMF catalog process determines that none of the
dumps stored on it are needed for file recovery.
It is rare that you must manually change the status of tapes in the TMF catalog. If you
specified RELEASED ON in an ALTER CATALOG command, for example, you need to
change the status of released tapes to SCRATCH when you want to reuse them for
new dumps.
If you try to perform file recovery and get error messages telling you that the tape
volume being used is unreadable, you might decide to alter its state to bad and retry
the file recovery operation, which then automatically uses the next-older generation of
dumps (for online dumps) or the alternate copy (for audit dumps). More likely, though,
you would change the state of the individual dump files that failed to invalid (refer to
Changing the State of a Dump on page 6-5).
When you use an ALTER TAPEMEDIA command to change the status of a tape to
released or scratch, it also deletes the dump entries for all dump files that are stored
exclusively on the tape; dump files that span two or more tapes are merely released.
You must be a member of the super user group to use the ALTER TAPEMEDIA
command.
Removing Tape Volumes from the Catalog
You use the DELETE TAPEMEDIA command to remove the tape media entry for a
tape volume from the TMF catalog. You would use this command, for example, if a
tape volume becomes physically unreadable, or if you want to relabel a tape volume at
a different density.
When the DELETE TAPEMEDIA command removes the tape media entry, it also
removes the dump entries for the files stored on the removed tape volume. As with
ALTER TAPEMEDIA, dump entries for all dump files that are stored exclusively on the
tape are deleted; those that span two or more tapes are merely released.
You must be a member of the super user group to use the DELETE TAPEMEDIA
command.