BACKUP(8)                                               BACKUP(8)

          backup, tobackup, dumparenas, restore - backup venti arenas
          to blu-ray discs or restore from them

          backup [ -n ] [ -d dev ] [ -s set ]
          tobackup [ set ]
          dumparenas dev arena ...
          restore arena-# [ dev ]

          These programs reside in /sys/lib/backup and provide a means
          to backup venti(8) storage to Blu-ray (or other large opti-
          cal) discs, while keeping track of which arenas have been
          written to which discs.  Multiple backup sets are supported,
          as is (re)loading a venti store from a backup thus made.

          The first time that backup is run, it will dump all sealed
          venti arenas.  Thereafter, it will append only those sealed
          arenas not already written to a disc within the given backup
          set.  The -s option uses a backup set other than the
          default.  The -d option uses a disc burner other than the
          default `/dev/sdD0'.  The -n option goes through the motions
          but does not burn any tracks on the Blu-ray disc.

          Tobackup prints the names of all the sealed arenas not yet
          backed up to a disc in the current set.

          Dumparenas copies the named arenas, one per track, to the
          device dev, which is first mounted via cdfs(4).
          Venti/rdarena is used to extract each arena.

          Tobackup and dumparenas are invoked internally by backup.

          Restore copies each data track (assumed to be a saved arena)
          on dev (by default, `/dev/sdC0') into its appropriate place
          in the venti arenas partition (locally, /dev/sde0/arenas),
          thus adding the arena to the current venti store.  The arena
          size of the arena partition must match the size of the are-
          nas on optical disc (except for ~60K of trailing debris on
          the optical disc arenas).

          Arena-# must be the number (starting from zero) of the first
          arena slot in the arenas partition that you wish to restore
          into from the current optical disc (not necessarily that of
          the first arena on the disc).  Restore will prompt for con-
          firmation that the first arena is the correct one, after
          printing a summary of its arena header.  Typing `y' will
          proceed normally, `n' will abort all processing, and `skip'
          will cause restore to proceed to the next track and ask for

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     BACKUP(8)                                               BACKUP(8)

          confirmation of it.

          The arenas partition must be formatted (see fmtarenas in
          venti-fmt(8)) before restoring into it.  When all the arenas
          have been restored, it will be necessary to build a new
          venti index, the usual steps being to run checkarenas,
          fmtisect, fmtbloom, fmtindex, and buildindex -b, all from

          /sys/lib/backup  backup scripts and records
          set1             subdirectory containing records for default
                           backup set
          /sys/log         source of dump scores


          venti(1), cdfs(4), venti(8), venti-fmt(8), venti-backup(8)
          Venti Backup on Blu-Ray Discs

          Assumes a single arenas partition named `arena0'.  Assumes
          that the file server's arenas are accessible on it as

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