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- If the content of a file changes a new archive copy has to be produced. (You can not modify just the relevant bits on the tape.)
- The previous archive copy becomes useless (aside from having an additional backup of a previous version).
- If a file is deleted, the archive copy becomes useless, too.
- Both processes result in unused (invalid) sections on a tape.
- Eventually only a small part of a tape contains relevant (up to date) information. The residual data is archived on other tapes, the old tape is erased and can be used for future archive copies.
- This happens by the following tasks:
- The recycler marks the tape and/or files with R.
- The next archiver run finds these files and starts re-archiving, the R flag of the file vanishes and a new vsn (volume serial name) for this copy is set.
- The recycler recognises that all files are copied somewhere else, because they have a new unique vsn. The old tape gets the status c (old candiadat) and depending on the settings in /etc/opt/SUNWsamfs/recycler.delay an atq job is scheduled for /etc/opt/SUNWsamfs/scripts/recycler.sh.
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