inventory policy
In all operations described here the media manager checks whether the correct tape has
been placed in the drive. To this inventory policy end, the media manager writes an unambiguous signature
to every tape, which it records in the metadata database. Every time a tape is inserted
the media manager compares the signature on the tape with the signature in the metadata
database. This ensures that no tapes are accidentally overwritten and that the correct data
is written back during a restore operation.
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