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<TITLE>Administration Reference</TITLE>
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<META HTTP-EQUIV="updated" CONTENT="Tue, 03 Oct 2000 16:18:29">
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<A NAME="Top_Of_Page"></A>
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<H1>Administration Reference</H1>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf125.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Bot_Of_Page"><IMG SRC="../bot.gif" BORDER="0" ALT="[Bottom of Topic]"></A> <A HREF="auarf127.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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<P>
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<H2><A NAME="HDRBUTC" HREF="auarf002.htm#ToC_140">butc</A></H2>
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<A NAME="IDX4691"></A>
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<A NAME="IDX4692"></A>
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<A NAME="IDX4693"></A>
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<A NAME="IDX4694"></A>
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<A NAME="IDX4695"></A>
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<A NAME="IDX4696"></A>
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<P><STRONG>Purpose</STRONG>
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<P>Initializes the Tape Coordinator process
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<P><STRONG>Synopsis</STRONG>
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<PRE><B>butc</B> [<B>-port</B> <<VAR>port offset</VAR>>] [<B>-debuglevel</B> < <B>0</B> | <B>1</B> | <B>2</B> >]
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[<B>-cell</B> <<VAR>cell name</VAR>>] [<B>-noautoquery</B>]
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[<B>-localauth</B>] [<B>-help</B>]
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<B>butc</B> [<B>-p</B> <<VAR>port offset</VAR>>] [<B>-d</B> < <B>0</B> | <B>1</B> | <B>2</B> >]
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[<B>-c</B> <<VAR>cell name</VAR>>] [<B>-n</B>] [<B>-l</B>] [<B>-h</B>]
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</PRE>
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<P><STRONG>Description</STRONG>
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<P>The <B>butc</B> command initializes a Tape Coordinator process on a
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Tape Coordinator machine, enabling an operator to direct Backup System
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requests to the associated tape device or backup data file. (The Tape
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Coordinator controls a backup data file if the <B>FILE YES</B> instruction
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appears in the <B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file that
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corresponds to the Tape Coordinator's entry in the
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<B>/usr/afs/backup/tapeconfig</B> file. For the sake of simplicity,
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the following discusses tape devices only.)
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<P>It is conventional to start and run the Tape Coordinator in the
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foreground. In this case, it runs on its own connection, which is
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unavailable for any other use and must remain open the entire time the Tape
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Coordinator is to accept backup requests and while it is executing
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them. (When using a window manager, the connection corresponds to a
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separate command shell window.) The Tape Coordinator can run in the
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background if the <B>CFG_</B><VAR>device_name</VAR> file is configured to
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eliminate any need for the Tape Coordinator to prompt the operator. In
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both the foreground and background, the Tape Coordinator writes operation
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traces and other output to the standard output stream on the connection over
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which it was started. Use the <B>-debuglevel</B> argument to
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control the amount of information that appears. The Tape Coordinator
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also writes traces and error messages to two files in the local
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<B>/usr/afs/backup</B> directory:
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<UL>
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<P><LI>The <B>TE_</B><VAR>device_name</VAR> file records problems that the Tape
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Coordinator encounters as it executes backup operations.
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<P><LI>The <B>TL_</B><VAR>device_name</VAR> file records a trace of operations
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as well as the same errors written to the <B>TE_</B><VAR>device_name</VAR>
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file.
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</UL>
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<P>The Tape Coordinator creates the files automatically as it
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initializes. If there are existing files, the Tape Coordinator renames
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them with a <B>.old</B> extension, overwriting the existing
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<B>.old</B> files if they exist. It derives the
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<VAR>device_name</VAR> part of the file names by stripping off the device
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name's <B>/dev/</B> prefix and replacing any other slashes with
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underscores. For example, the files are called <B>TE_rmt_4m</B> and
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<B>TL_rmt_4m</B> for a device called <B>/dev/rmt/4m</B>.
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<P>By default, at the beginning of each operation the Tape Coordinator prompts
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for the operator to insert the first tape into the drive and press
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<<B>Return</B>>. To suppress this prompt, include the
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<B>-noautoquery</B> flag on the command line or the instruction
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<B>AUTOQUERY NO</B> in the
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<B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file. When the
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prompt is suppressed, the first required tape must be in the drive before a
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<B>backup</B> command is issued. For subsequent tapes, the Tape
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Coordinator uses its normal tape acquisition routine: if the
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<B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file includes a
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<B>MOUNT</B> instruction, the Tape Coordinator invokes the indicated
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command; otherwise, it prompts the operator for the next tape.
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<P>To stop the Tape Coordinator process, enter an interrupt signal such as
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<<B>Ctrl-c</B>> over the dedicated connection (in the command shell
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window).
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<P>To cancel a <B>backup</B> operation that involves a tape before it
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begins (assuming the initial tape prompt has not been suppressed), enter the
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letter <B>a</B> (for <B>abort</B>) and press <<B>Return</B>> at
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the Tape Coordinator's prompt for the first tape.
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<P>Tape Coordinator operation depends on the correct configuration of certain
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files, as described in the following list:
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<UL>
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<P><LI>The local <B>/usr/afs/backup/tapeconfig</B> file must include an entry
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for the Tape Coordinator that specifies its device name and port offset
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number, among other information; for details, see the
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<B>tapeconfig</B> reference page.
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<P><LI>The port offset number recorded in the Tape Coordinator's entry in
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the Backup Database must match the one in the <B>tapeconfig</B>
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file. Create the Backup Database entry by using the <B>backup
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addhost</B> command.
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<P><LI>The optional <B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file can
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contain instructions for mounting and unmounting tapes automatically (when
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using a tape stacker or jukebox, for instance) or automating other aspects of
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the backup process. The <VAR>device_name</VAR> part of the name is
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derived as described previously for the <B>TE_</B><VAR>device_name</VAR> and
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<B>TL_</B><VAR>device_name</VAR> files.
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</UL>
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<P><STRONG>Cautions</STRONG>
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<P>If the Tape Coordinator machine is an AIX machine, use the <B>SMIT</B>
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utility to set the device's block size to 0 (zero), indicating variable
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block size. Otherwise, tape devices attached to machines running other
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operating systems sometimes cannot read tapes written on AIX machines.
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For instructions, see the <I>IBM AFS Administration Guide</I> chapter
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about configuring the Backup System.
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<P><STRONG>Options</STRONG>
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<DL>
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<P><DT><B>-port
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</B><DD>Specifies the port offset number of the Tape Coordinator to
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initialize.
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<P><DT><B>-debuglevel
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</B><DD>Controls the amount and type of messages the Tape Coordinator displays on
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the standard output stream. Provide one of three acceptable
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values:
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<UL>
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<P><LI><B>0</B> to display the minimum level of detail required to describe
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Tape Coordinator operations, including prompts for tapes, messages that
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indicate the beginning and end of operations, and error messages. This
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is the default value.
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<P><LI><B>1</B> to display the names of the volumes being dumped or restored
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as well as the information displayed at level 0.
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<P><LI><B>2</B> to display all messages also being written to the
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<B>TL_</B><VAR>device_name</VAR> log file.
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</UL>
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<P><DT><B>-cell
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</B><DD>Names the cell in which the Tape Coordinator operates (the cell to which
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the file server machines that house affected volumes belong). If this
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argument is omitted, the Tape Coordinator runs in the local cell as defined in
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the local <B>/usr/vice/etc/ThisCell</B> file. Do not combine this
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flag with the <B>-localauth</B> argument.
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<P><DT><B>-noautoquery
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</B><DD>Suppresses the Tape Coordinator's prompt for insertion of the first
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tape needed for an operation. The operator must insert the tape into
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the drive before issuing the <B>backup</B> command that initializes the
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operation.
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<P><DT><B>-localauth
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</B><DD>Constructs a server ticket using the server encryption key with the
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highest key version number in the local
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<B>/usr/afs/etc/KeyFile</B>. The <B>butc</B> command
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interpreter presents the ticket, which never expires, to the Volume Server and
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Volume Location Server to use in mutual authentication.
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<P>Do not combine this argument with the <B>-cell</B> flag, and use it
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only when logged on to a server machine as the local superuser
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<B>root</B>; client machines do not have
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<B>/usr/afs/etc/KeyFile</B> file.
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<P><DT><B>-help
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</B><DD>Prints the online help for this command. All other valid options
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are ignored.
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</DL>
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<P><STRONG>Examples</STRONG>
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<P>The following command starts the Tape Coordinator with port offset
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<B>7</B> at debug level <B>1</B>, meaning the Tape Coordinator reports
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the names of volumes it is dumping or restoring.
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<PRE> % <B>butc -port 7 -debuglevel 1</B>
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</PRE>
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<P><STRONG>Privilege Required</STRONG>
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<P>The issuer must be listed in the <B>/usr/afs/etc/UserList</B> file on
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every machine where the Backup Server or Volume Location (VL) Server is
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running, and on every file server machine that houses a volume to be backed
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up. If the <B>-localauth</B> flag is included, the issuer must
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instead be logged on to the Tape Coordinator machine as the local superuser
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<B>root.</B> In addition, the issuer must be able to read and write
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to the log and configuration files in the local <B>/usr/afs/backup</B>
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directory.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf018.htm#HDRCFG">CFG_<I>device_name</I></A>
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<P><A HREF="auarf023.htm#HDRKEYFILE">KeyFile</A>
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<P><A HREF="auarf031.htm#HDRTE">TE_<I>device_name</I></A>
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<P><A HREF="auarf032.htm#HDRCLI_THISCELL">ThisCell (client version)</A>
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<P><A HREF="auarf034.htm#HDRTL">TL_<I>device_name</I></A>
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<P><A HREF="auarf035.htm#HDRUSERLIST">UserList</A>
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<P><A HREF="auarf050.htm#HDRTAPECONFIG">tapeconfig</A>
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<P><A HREF="auarf062.htm#HDRBK_ADDHOST">backup addhost</A>
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<P>
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<HR><P ALIGN="center"> <A HREF="../index.htm"><IMG SRC="../books.gif" BORDER="0" ALT="[Return to Library]"></A> <A HREF="auarf002.htm#ToC"><IMG SRC="../toc.gif" BORDER="0" ALT="[Contents]"></A> <A HREF="auarf125.htm"><IMG SRC="../prev.gif" BORDER="0" ALT="[Previous Topic]"></A> <A HREF="#Top_Of_Page"><IMG SRC="../top.gif" BORDER="0" ALT="[Top of Topic]"></A> <A HREF="auarf127.htm"><IMG SRC="../next.gif" BORDER="0" ALT="[Next Topic]"></A> <A HREF="auarf284.htm#HDRINDEX"><IMG SRC="../index.gif" BORDER="0" ALT="[Index]"></A> <P>
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