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NAME

       backup_readlabel - Reads and displays a tape's label

SYNOPSIS

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

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

DESCRIPTION

       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.

OPTIONS

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

       -localauth
           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).

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

OUTPUT

       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.

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

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

       size
           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.

       useCount
           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 output.

EXAMPLES

       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 = abc.com
          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 tape.

          % 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 = abc.com
          size = 2097152 Kbytes
          dump path = /monthly
          dump id = 909899900
          useCount = 1
          ---- End of tape label ----

PRIVILEGE REQUIRED

       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.

SEE ALSO

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

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> 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.