BACKUP_LABELTAPE(8) AFS Command Reference BACKUP_LABELTAPE(8)NAMEbackup_labeltape - Creates the magnetic label on a tape
SYNOPSIS
backup labeltape [-name <AFS tape name, defaults to NULL>]
[-size <tape size in Kbytes, defaults to size in tapeconfig>]
[-portoffset <TC port offset>]
[-pname <permanent tape name>]
[-localauth] [-cell <cell name>] [-help]
backup la [-n <AFS tape name, defaults to NULL>]
[-s <tape size in Kbytes, defaults to size in tapeconfig>]
[-po <TC port offset>]
[-pn <permanent tape name>]
[-l] [-c <cell name>] [-h]
DESCRIPTION
The backup labeltape command creates a magnetic label, readable by the
Backup System, at the beginning of a tape. The label records 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
/usr/afs/backup/CFG_device_name file on the Tape Coordinator machine
associated with the specified port offset, then the backup command
writes label information to the first 16 KB block in the backup data
file listed for that port offset in the Tape Coordinator's
/usr/afs/backup/tapeconfig file, rather than at the beginning of a
tape. For the sake of clarity, the following text refers to tapes only,
but the Backup System handles backup data files in much the same way.)
Relabeling a tape that already contains AFS backup data effectively
makes the data unusable, because the command removes the Backup
Database record of the complete dump set of which the tape is a part.
Use this command to enable recycling of a tape that contains unexpired
dumps that are not actually still needed.
To write a permanent name on the label, include the -pname argument to
specify a string of up to 32 characters. The permanent name persists
until the -pname argument is again included on the backup labeltape
command, regardless of the tape's contents and of how often the tape is
otherwise relabeled or recycled. Include this argument or the -name
argument, but not both. If this argument is included, the AFS tape name
is set to "<NULL>". The permanent name is set to "<NULL>" if this
argument is omitted and no permanent name already exists.
The issuer must ensure that a permanent name is unique among the tapes
used for AFS backup in the cell, because the backup command interpreter
does not verify that another tape does not already have the same
permanent name. When a tape has a permanent name, the Backup System
uses it instead of the AFS tape name in most prompts and when referring
to the tape in output from backup commands. The permanent name appears
in the "tape name" field of the output from the backup readlabel
command.
To write an AFS tape name on the label, provide a value for the -name
argument in the required format described in OPTIONS. Include the
-name argument or the -pname argument, but not both. If this argument
is omitted, the AFS tape name is set to "<NULL>", but the Backup System
automatically assigns the appropriate name when the tape is used in a
future backup dump or backup savedb operation. The AFS tape name
appears in the "AFS tape name" field of the output from the backup
readlabel and backup scantape commands.
The backup command interpreter does not accept the -name argument if
the tape already has a permanent name. To erase a tape's permanent
name, provide a null value to the -pname argument by issuing the
following command:
% backup labeltape -pname ""
To record the tape's capacity on the label, specify a number of
kilobytes as the -size argument. If the argument is omitted the first
time a tape is labeled, the Backup System records the default tape
capacity recorded for the specified port offset in the
/usr/afs/backup/tapeconfig file on the Tape Coordinator machine.
Subsequently, the value in the size field persists until the -size
argument is again included on the backup labeltape command.
To determine how much data can be written to a tape during a backup
dump or backup savedb operation, the Tape Coordinator reads the
capacity recorded on the tape's label (or uses the value associated
with its port offset in the /usr/afs/backup/tapeconfig file, if the
tape was never labeled). For further description, see the backup dump
reference page.
The Tape Coordinator's default response to this command is to access
the tape by invoking the "MOUNT" instruction in the local
/usr/afs/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-name <AFS tape name>
Specifies the AFS tape name to record on the label. Include this
argument or the -pname argument, but not both. If this argument is
omitted, the AFS tape name is set to "<NULL>". If this argument is
provided, it must have the following format:
<volume_set_name>.<dump_level_name>.<tape_index>
for the tape to be acceptable for use in a future backup dump
operation. The <volume_set_name> must match the volume set name of
the initial dump to be written to the tape, <dump_level_name> must
match the last element of the dump level pathname at which the
volume set will be dumped, and <tape_index> indicates the order of
the tape in the dump set (indexing begins with 1). To disable this
type of name checking, include the "NAME_CHECK NO" instruction in
the CFG_device_name file.
For the tape to be acceptable for use in a future backup savedb
operation, the value specified for the -name argument must have the
following format:
Ubik_db_dump.<tape_index>
where <tape_index> indicates the order of the tape in the set of
tapes that house the Backup Database dump; indexing begins with 1
(one).
-size <tape size>
Specifies the tape capacity to record on the label. Provide an
integer value followed by a letter that indicates units, with no
intervening space. A unit value of "k" or "K" indicates kilobytes,
"m" or "M" indicates megabytes, and "g" or "G" indicates gigabytes.
If the units letter is omitted, the default is kilobytes.
If this argument is omitted the first time a tape is labeled, the
Backup System records the capacity that is associated with the
specified port offset in the /usr/afs/backup/tapeconfig file on the
Tape Coordinator machine. The value recorded the first time then
persists until the -size argument is provided on a future issuance
of the command.
-portoffset <TC port offset>
Specifies the port offset number of the Tape Coordinator handling
the tape for this operation.
-pname <permanent tape name>
Specifies the permanent name to record on the label. It can be up
to 32 characters in length, and include any alphanumeric
characters. Avoid metacharacters that have a special meaning to
the shell, to avoid having to mark them as literal in commands
issued at the shell prompt.
Include this argument or the -name argument, but not both. If this
argument is provided, the AFS tape name is set to "<NULL>". If this
argument is omitted, any existing permanent name is retained.
-localauth
Constructs a server ticket using a key from the local
/usr/afs/etc/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.
EXAMPLES
The following command records the AFS tape name "user.monthly.1" on the
label of the tape in the device with port offset 3:
% backup labeltape -name user.monthly.1 -portoffset 3
The following three commands are equivalent in effect: they all record
a capacity of 2 GB on the label of the tape in the device with port
offset 4. They set the AFS tape name to "<NULL>" and leave the
permanent name unchanged.
% backup labeltape -size 2g -portoffset 4
% backup labeltape -size 2048M -portoffset 4
% backup labeltape -size 2097152 -portoffset 4
PRIVILEGE REQUIRED
The issuer must be listed in the /usr/afs/etc/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 ALSObutc(5), backup(8), backup_readlabel(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.
OpenAFS 2013-10-09 BACKUP_LABELTAPE(8)
