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.