=head1 NAME backup_readlabel - Reads and displays a tape's label =head1 SYNOPSIS =for html
B S<<< [B<-portoffset> >] >>> [B<-localauth>] S<<< [B<-cell> >] >>> [B<-help>] B S<<< [B<-p> >] >>> [B<-l>] S<<< [B<-c> >] >>> [B<-h>] =for html
=head1 DESCRIPTION The B command displays information from the magnetic tape label of a tape. The information includes the tape's name (either a I, or an I that reflects the tape's contents in a prescribed format) and its capacity. If the C instruction appears in the F> file associated with the specified port offset, then the B 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 F 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 C instruction in the local F> file, or by prompting the backup operator to insert the tape if there is no C instruction. However, if the C instruction appears in the F> file, or if the issuer of the B command included the B<-noautoquery> flag, the Tape Coordinator instead expects the tape to be in the device already. If it is not, the Tape Coordinator invokes the C instruction or prompts the operator. =head1 OPTIONS =over 4 =item B<-portoffset> > Specifies the port offset number of the Tape Coordinator handling the tapes for this operation. =item B<-localauth> Constructs a server ticket using a key from the local F file. The B command interpreter presents it to the Backup Server, Volume Server and VL Server during mutual authentication. Do not combine this flag with the B<-cell> argument. For more details, see L. =item B<-cell> > Names the cell in which to run the command. Do not combine this argument with the B<-localauth> flag. For more details, see L. =item B<-help> Prints the online help for this command. All other valid options are ignored. =back =head1 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: () size: Kbytes where is the permanent name if the tape has one, or the AFS tape name otherwise. The is dump ID of the initial dump on the tape, and is the recorded capacity of the tape in kilobytes. The output in the Tape Coordinator windows is bounded by an underlined C header at the top, and the following string at the bottom: -- End of tape label -- In between are lines reporting the following information: =over 4 =item tape name The permanent name assigned by using the -pname argument of the B 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 C<< >> appears in this field. =item 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 B or B operation, or the operator can assign it with the B<-name> argument to the B command. =over 4 =item * IB<.>I.I, if the tape contains volume data. The I 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; I is the last pathname element of the dump level at which the initial dump was backed up; and I is the numerical position of the tape in the dump set. =item * CI if the tape contains a dump of the Backup Database, created with the B command. The I is the ordinal of the tape in the dump set. =item * C<< >> if the tape has no AFS tape name. This is normally the case if the B<-name> argument was not included the last time the B command was used on this tape, and no data has been written to it since. =back =item creationTime The date and time at which the Backup System started performing the dump operation that created the initial dump. =item cell The cell in which the dump set was created. This is the cell whose Backup Database contains a record of the dump set. =item 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 B<-size> argument to the B command or derived from the F file on the Tape Coordinator machine, not from a measurement of the tape. =item dump path The dump level of the initial dump in the dump set. =item dump id The dump ID number of the initial dump in the dump set, as recorded in the Backup Database. =item useCount The number of times a dump has been written to the tape, or it has been relabeled. =back The message C indicates the completion of the output. =head1 EXAMPLES The following example shows the output for the tape with permanent name C 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 = example.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 = AFS tape name = guests.monthly.2 creationTime = Sun Nov 1 00:58:20 1998 cell = example.com size = 2097152 Kbytes dump path = /monthly dump id = 909899900 useCount = 1 ---- End of tape label ---- =head1 PRIVILEGE REQUIRED The issuer must be listed in the F file on every machine where the Backup Server is running, or must be logged onto a server machine as the local superuser C if the B<-localauth> flag is included. =head1 SEE ALSO L, L, L, L =head1 COPYRIGHT 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.