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           butc [-port <port offset>] [-debuglevel (0 | 1 | 2)]
               [-cell <cell name>] [-noautoquery] [-localauth] [-help]
           butc [-p <port offset>] [-d (0 | 1 | 2)]
               [-c <cell name>] [-n] [-l] [-h]


           The butc command initializes a Tape Coordinator process on a Tape
           Coordinator machine, enabling an operator to direct Backup System
           requests to the associated tape device or backup data file. (The Tape
           Coordinator controls a backup data file if the "FILE YES" instruction
           appears in the /var/lib/openafs/backup/CFG_device_name file that
           corresponds to the Tape Coordinator's entry in the
           /var/lib/openafs/backup/tapeconfig file. For the sake of simplicity,
           the following discusses tape devices only.)
           It is conventional to start and run the Tape Coordinator in the
           foreground. In this case, it runs on its own connection, which is
           unavailable for any other use and must remain open the entire time the
           Tape Coordinator is to accept backup requests and while it is executing
           them. (When using a window manager, the connection corresponds to a
           separate command shell window.) The Tape Coordinator can run in the
           background if the CFG_device_name file is configured to eliminate any
           need for the Tape Coordinator to prompt the operator. In both the
           foreground and background, the Tape Coordinator writes operation traces
           and other output to the standard output stream on the connection over
           which it was started. Use the -debuglevel argument to control the
           amount of information that appears. The Tape Coordinator also writes
           traces and error messages to two files in the local
           /var/lib/openafs/backup directory:
           ?   The TE_device_name file records problems that the Tape Coordinator
               encounters as it executes backup operations.
           ?   The TL_device_name file records a trace of operations as well as
               the same errors written to the TE_device_name file.
           The Tape Coordinator creates the files automatically as it initializes.
           If there are existing files, the Tape Coordinator renames them with a
           ".old" extension, overwriting the existing ".old" files if they exist.
           It derives the device_name part of the file names by stripping off the
           device name's /dev/ prefix and replacing any other slashes with
           underscores. For example, the files are called TE_rmt_4m and TL_rmt_4m
           for a device called /dev/rmt/4m.
           By default, at the beginning of each operation the Tape Coordinator
           prompts for the operator to insert the first tape into the drive and
           press Return.  To suppress this prompt, include the -noautoquery flag
           on the command line or the instruction "AUTOQUERY NO" in the
           /var/lib/openafs/backup/CFG_device_name file. When the prompt is
           suppressed, the first required tape must be in the drive before a
           Tape Coordinator operation depends on the correct configuration of
           certain files, as described in the following list:
           ?   The local /var/lib/openafs/backup/tapeconfig file must include an
               entry for the Tape Coordinator that specifies its device name and
               port offset number, among other information; for details,
           ?   The port offset number recorded in the Tape Coordinator's entry in
               the Backup Database must match the one in the tapeconfig file.
               Create the Backup Database entry by using the backup addhost
           ?   The optional /var/lib/openafs/backup/CFG_device_name file can
               contain instructions for mounting and unmounting tapes
               automatically (when using a tape stacker or jukebox, for instance)
               or automating other aspects of the backup process. The device_name
               part of the name is derived as described previously for the
               TE_device_name and TL_device_name files.


           If the Tape Coordinator machine is an AIX machine, use the SMIT utility
           to set the device's block size to 0 (zero), indicating variable block
           size. Otherwise, tape devices attached to machines running other
           operating systems sometimes cannot read tapes written on AIX machines.
           For instructions, see the OpenAFS Administration Guide chapter about
           configuring the Backup System.


           -port <port offset>
               Specifies the port offset number of the Tape Coordinator to
               Controls the amount and type of messages the Tape Coordinator
               displays on the standard output stream. Provide one of three
               acceptable values:
               ?   0 to display the minimum level of detail required to describe
                   Tape Coordinator operations, including prompts for tapes,
                   messages that indicate the beginning and end of operations, and
                   error messages. This is the default value.
               ?   1 to display the names of the volumes being dumped or restored
                   as well as the information displayed at level 0.
               ?   2 to display all messages also being written to the
                   TL_device_name log file.
           -cell <cell name>
               Names the cell in which the Tape Coordinator operates (the cell to
               which the file server machines that house affected volumes belong).
               the ticket, which never expires, to the Volume Server and Volume
               Location Server to use in mutual authentication.
               Do not combine this argument with the -cell flag, and use it only
               when logged on to a server machine as the local superuser "root";
               client machines do not have /etc/openafs/server/KeyFile file.
               Prints the online help for this command. All other valid options
               are ignored.


           The following command starts the Tape Coordinator with port offset 7 at
           debug level 1, meaning the Tape Coordinator reports the names of
           volumes it is dumping or restoring.
              % butc -port 7 -debuglevel 1


           The issuer must be listed in the /etc/openafs/server/UserList file on
           every machine where the Backup Server or Volume Location (VL) Server is
           running, and on every file server machine that houses a volume to be
           backed up. If the -localauth flag is included, the issuer must instead
           be logged on to the Tape Coordinator machine as the local superuser
           "root". In addition, the issuer must be able to read and write to the
           log and configuration files in the local /var/lib/openafs/backup


           KeyFile(5), ThisCell(5), UserList(5), butc(5), butc_logs(5),
           tapeconfig(5), backup_addhost(8)


           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.

    OpenAFS 2012-03-26 BUTC(8)


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