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       backup_readlabel - Reads and displays a tape’s label


       backup readlabel [-portoffset <TC port offset>] [-localauth]
           [-cell <cell name>] [-help]

       backup rea [-p <TC port offset>] [-l] [-c <cell name>]


       The backup readlabel command displays information from the magnetic
       tape label of a tape. The information includes the tape’s name (either
       a permanent name, or an AFS tape name that reflects the tape’s contents
       in a prescribed format) and its capacity.

       If the "FILE YES" instruction appears in the
       /var/lib/openafs/backup/CFG_device_name file associated with the
       specified port offset, then the backup readlabel command reads the
       label information from the first 16 KB block in the backup data file
       listed for that port offset in the Tape Coordinator’s
       /var/lib/openafs/backup/tapeconfig file, rather than from the beginning
       of a tape.

       The Tape Coordinator’s default response to this command is to access
       the tape by invoking the "MOUNT" instruction in the local
       /var/lib/openafs/backup/CFG_device_name file, or by prompting the
       backup operator to insert the tape if there is no "MOUNT" instruction.
       However, if the "AUTOQUERY NO" instruction appears in the
       CFG_device_name file, or if the issuer of the butc command included the
       -noautoquery flag, the Tape Coordinator instead expects the tape to be
       in the device already.  If it is not, the Tape Coordinator invokes the
       "MOUNT" instruction or prompts the operator.


       -portoffset <TC port offset>
           Specifies the port offset number of the Tape Coordinator handling
           the tapes for this operation.

           Constructs a server ticket using a key from the local
           /etc/openafs/server/KeyFile file. The backup command interpreter
           presents it to the Backup Server, Volume Server and VL Server
           during mutual authentication. Do not combine this flag with the
           -cell argument. For more details, see backup(8).

       -cell <cell name>
           Names the cell in which to run the command. Do not combine this
           argument with the -localauth flag. For more details, see backup(8).

           Prints the online help for this command. All other valid options
           are ignored.


       Output from this command appears in both the shell window where the
       command is issued, and in the Tape Coordinator window.

       If the tape is unlabeled or if the specified tape device is empty, the
       output reads

          Failed to read tape label.

       Otherwise, the output in the shell window has the following format:

          Tape read was labelled: <tape name> (<dump id>)
               size: <size> Kbytes

       where <tape name> is the permanent name if the tape has one, or the AFS
       tape name otherwise. The <dump ID> is dump ID of the initial dump on
       the tape, and <size> is the recorded capacity of the tape in kilobytes.

       The output in the Tape Coordinator windows is bounded by an underlined
       "Tape label" header at the top, and the following string at the bottom:

          -- End of tape label --

       In between are lines reporting the following information:

       tape name
           The permanent name assigned by using the -pname argument of the
           backup labeltape command. This name remains on the tape until that
           argument is used again, no matter how many times the tape is
           recycled or otherwise relabeled. If the tape does not have a
           permanent name, the value "<NULL>" appears in this field.

       AFS tape name
           A tape name in one of the following prescribed formats. The Backup
           System automatically writes the appropriate AFS tape name to the
           label as part of a backup dump or backup savedb operation, or the
           operator can assign it with the -name argument to the backup
           labeltape command.

           ·   volume_set_name.dump_level_name.tape_index, if the tape
               contains volume data. The volume_set_name is the name of the
               volume set that was dumped to create the initial dump in the
               dump set of to which this tape belongs; dump_level_name is the
               last pathname element of the dump level at which the initial
               dump was backed up; and tape_index is the numerical position of
               the tape in the dump set.

           ·   "Ubik.db.dump."tape_index if the tape contains a dump of the
               Backup Database, created with the backup savedb command. The
               tape_index is the ordinal of the tape in the dump set.

           ·   "<NULL>" if the tape has no AFS tape name. This is normally the
               case if the -name argument was not included the last time the
               backup labeltape command was used on this tape, and no data has
               been written to it since.

           The date and time at which the Backup System started performing the
           dump operation that created the initial dump.

           The cell in which the dump set was created. This is the cell whose
           Backup Database contains a record of the dump set.

           The tape’s capacity (in kilobytes) as recorded on the label, rather
           than the amount of data on the tape. The value is assigned by the
           -size argument to the backup labeltape command or derived from the
           /var/lib/openafs/backup/tapeconfig file on the Tape Coordinator
           machine, not from a measurement of the tape.

       dump path
           The dump level of the initial dump in the dump set.

       dump id
           The dump ID number of the initial dump in the dump set, as recorded
           in the Backup Database.

           The number of times a dump has been written to the tape, or it has
           been relabeled.

       The message "ReadLabel: Finished" indicates the completion of the


       The following example shows the output for the tape with permanent name
       "oct.guest.dump" and capacity 2 MB, expressed in kilobyte units
       (2097152 equals 2 times 10242).

          % backup readlabel -portoffset 6
          Tape read was labelled: oct.guest.dump (907215000)
               size: 2097152 Kbytes

       The output in the Tape Coordinator window reads:

          Tape label
          tape name = oct.guest.dump
          AFS tape name = guests.monthly.3
          creationTime = Thu Oct 1 00:10:00 1998
          cell =
          size = 2097152 Kbytes
          dump path = /monthly
          dump id = 907215000
          useCount = 5
          ---- End of tape label ----

       The following example is for a tape that does not have a permanent

          % backup readlabel -portoffset 6
          Tape read was labelled: guests.monthly.2 (909899900)
               size: 2097152 Kbytes

       The output in the Tape Coordinator window reads:

          Tape label
          tape name = <NULL>
          AFS tape name = guests.monthly.2
          creationTime = Sun Nov 1 00:58:20 1998
          cell =
          size = 2097152 Kbytes
          dump path = /monthly
          dump id = 909899900
          useCount = 1
          ---- End of tape label ----


       The issuer must be listed in the /etc/openafs/server/UserList file on
       every machine where the Backup Server is running, or must be logged
       onto a server machine as the local superuser "root" if the -localauth
       flag is included.


       butc(5), backup(8), backup_labeltape(8), butc(8)


       IBM Corporation 2000. <> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.
       It was converted from HTML to POD by software written by Chas Williams
       and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.