copy_tape - make a duplicate of a tape
copy_tape [ -v ] [ -c <configuration-file> ] [ -l <logfile> ] [ -T
<tmpdir> ] [ -M <server-message-config> ] [ -h <source-server> ] [ -P
<source-serverport> ] [ -F <tape-filenumber> ] [ -C <source-cartridge>
] [ -k <source-encryption-key-file> ] [ -D [ -h <target-server> ] [ -P
<target-serverport> ] [ -C <target-cartridge> ] [ -k <target-
encryption-key-file> ] ]
This command connects to one or two backup servers and makes an
identical copy of a tape to another one. The tape label is rewritten,
so that the destination tape keeps it’s primary cartridge number, but
gets the number of the source tape as secondary number. Thus it can be
used instead of the tape with that primary number. In fact both numbers
are accepted for backup, restore or other operations except the
copy_tape operation itself. Recursively copying an already duplicated
tape does not further change the secondary cartridge number, so e.g.
any copy of cartridge number 3 will be usable as such. Copying
cartridge 3 to cartridge 5 and then 5 to 8 does not make cartridge
number 8 usable as cartridge 5, but still as cartridge number 3.
When the backup server sees a cartridge with the wrong primary number,
but the correct secondary number, this cartridge is accepted, but a
warning is written to the serverside log.
The defaults for the copying source are taken from the client side
configuration file. Default source cartridge is the one currently
loaded in the drive on the server, that will be asked for this
information. If no target parameters are supplied, they get the values
of the appropriate source parameters as default. So if no arguments
are supplied, the current tape would be copied to itself, what is
prevented while printing an error message.
Target (or: destination) parameters must always be following the -D
option, source parameters must be supplied in an earlier position.
If the source tape is operated by a different server than the target,
copying goes straight from one to the other. As two servers (with a
different port number) can reside on one host, this process does not
necessarily imply a network connection. If source and target tape are
handled by the same server, the data to be copied must be stored
somewhere inbetween. For this purpose a temporary directory is created
on the client, where this program is started, usually in /tmp or
/var/tmp (see: tmpnam(3)). The filesystem, where this directory lives,
must have a free capacity of at least the largest occurring tape file.
This maximum tape file size is configured on the server side by the
parameter MaxBytesPerFile (see: afserver.conf(8)). If there is not
enough space, the duplication of the tape fails. The copying program
writes as many tape files to disk as it can, while a certain amount
will remain free. Then it ejects the source cartridge and loads the
target cartridge. Now the files in the temporary directory are written
to the target tape while immediately removing files, that are no longer
needed. The more space is available in the temporary directory, the
fewer cartridge loads/ejects are necessary.
The number of the cartridge to use as copying source or target
(depends on argument position: before or behind -D).
Use the given file for configuration information
If reading and writing should not start at the beginning of the
tape, but at the tape file with the given number. This can avoid
the overhead of copying entire tapes, when only some tape files
have been appended
The name of the backup server host, where the source or target
cartridge is handled, respectively
Use the contents of the given file as encryption key for
authenticating to the server, where the source or target
cartridge is handled, respectively
A file to write log information to
The configuration to output messages from the server, that
normally are sent only via mail to a maintainer. The first word
consisting of the letters b r v and c tells, whether to output
messages during backup, restore, verify and copy-tape,
respecively. The next words must name the service name or port
number of the single stream servers, related to the option -P .
For each multi stream service configured with -P or in the
configuration file, the respective single stream service must be
The port number of the backup server on the backup server host,
where the source or target cartridge is handled
use the given directory for temporarily storing the tapefiles,
when copying on one server
-v Verbose option, tell more about what is going on
Client configuration file
The directory for logging the client backups
Some internal state information of the client backups.
afclientconfig(8), xafclientconfig(8), full_backup(8), incr_backup(8),
afverify(8), afrestore(8), xafrestore(8), update_indexes(8),
copy_tape(8), afclient.conf(8), afserver(8), afmserver(8),
afbackup was written by Albert Fluegel (firstname.lastname@example.org).