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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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<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="auarf078.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="auarf080.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="HDRBK_LABELTAPE" HREF="auarf002.htm#ToC_93">backup labeltape</A></H2>
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<A NAME="IDX4345"></A>
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<P><STRONG>Purpose</STRONG>
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<P>Creates the magnetic label on a tape
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<P><STRONG>Synopsis</STRONG>
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<PRE><B>backup labeltape</B> [<B>-name</B> <<VAR>AFS tape name, defaults to NULL</VAR>>]
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[<B>-size</B> <<VAR>tape size in Kbytes, defaults to size in tapeconfig</VAR>>]
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[<B>-portoffset</B> <<VAR>TC port offset</VAR>>]
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[<B>-pname</B> <<VAR>permanent tape name</VAR>>]
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[<B>-localauth</B>] [<B>-cell</B> <<VAR>cell name</VAR>>] [<B>-help</B>]
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<B>backup la</B> [<B>-n</B> <<VAR>AFS tape name, defaults to NULL</VAR>>]
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[<B>-s</B> <<VAR>tape size in Kbytes, defaults to size in tapeconfig</VAR>>]
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[<B>-po</B> <<VAR>TC port offset</VAR>>] [<B>-pn</B> <<VAR>permanent tape name</VAR>>]
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[<B>-l</B>] [<B>-c</B> <<VAR>cell name</VAR>>] [<B>-h</B>]
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</PRE>
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<P><STRONG>Description</STRONG>
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<P>The <B>backup labeltape</B> command creates a magnetic label, readable
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by the Backup System, at the beginning of a tape. The label records the
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tape's name (either a <I>permanent name</I>, or an <I>AFS tape
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name</I> that reflects the tape's contents in a prescribed format) and
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its capacity.
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<P>(If the <B>FILE YES</B> instruction appears in the
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<B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file on the Tape
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Coordinator machine associated with the specified port offset, then the
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<B>backup</B> command writes label information to the first 16 KB block in
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the backup data file listed for that port offset in the Tape
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Coordinator's <B>/usr/afs/backup/tapeconfig</B> file, rather than at
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the beginning of a tape. For the sake of clarity, the following text
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refers to tapes only, but the Backup System handles backup data files in much
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the same way.)
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<P>Relabeling a tape that already contains AFS backup data effectively makes
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the data unusable, because the command removes the Backup Database record of
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the complete dump set of which the tape is a part. Use this command to
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enable recycling of a tape that contains unexpired dumps that are not actually
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still needed.
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<P>To write a permanent name on the label, include the <B>-pname</B>
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argument to specify a string of up to 32 characters. The permanent name
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persists until the <B>-pname</B> argument is again included on the
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<B>backup labeltape</B> command, regardless of the tape's contents
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and of how often the tape is otherwise relabeled or recycled. Include
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this argument or the <B>-name</B> argument, but not both. If this
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argument is included, the AFS tape name is set to <TT><NULL></TT>.
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The permanent name is set to <TT><NULL></TT> if this argument is omitted
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and no permanent name already exists.
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<P>The issuer must ensure that a permanent name is unique among the tapes used
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for AFS backup in the cell, because the <B>backup</B> command interpreter
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does not verify that another tape does not already have the same permanent
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name. When a tape has a permanent name, the Backup System uses it
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instead of the AFS tape name in most prompts and when referring to the tape in
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output from <B>backup</B> commands. The permanent name appears in
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the <TT>tape</TT> <TT>name</TT> field of the output from the <B>backup
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readlabel</B> command.
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<P>To write an AFS tape name on the label, provide a value for the
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<B>-name</B> argument in the required format described in the
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<B>Options</B> section. Include the <B>-name</B> argument or
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the <B>-pname</B> argument, but not both. If this argument is
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omitted, the AFS tape name is set to <TT><NULL></TT>, but the Backup
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System automatically assigns the appropriate name when the tape is used in a
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future <B>backup dump</B> or <B>backup savedb</B> operation.
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The AFS tape name appears in the <TT>AFS</TT> <TT>tape</TT>
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<TT>name</TT> field of the output from the <B>backup readlabel</B> and
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<B>backup scantape</B> commands.
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<P>The <B>backup</B> command interpreter does not accept the
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<B>-name</B> argument if the tape already has a permanent name. To
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erase a tape's permanent name, provide a null value to the
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<B>-pname</B> argument by issuing the following command:
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<PRE> % <B>backup labeltape -pname ""</B>
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</PRE>
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<P>To record the tape's capacity on the label, specify a number of
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kilobytes as the <B>-size</B> argument. If the argument is omitted
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the first time a tape is labeled, the Backup System records the default tape
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capacity recorded for the specified port offset in the
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<B>/usr/afs/backup/tapeconfig</B> file on the Tape Coordinator
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machine. Subsequently, the value in the size field persists until the
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<B>-size</B> argument is again included on the <B>backup labeltape</B>
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command.
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<P>To determine how much data can be written to a tape during a <B>backup
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dump</B> or <B>backup savedb</B> operation, the Tape Coordinator reads
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the capacity recorded on the tape's label (or uses the value associated
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with its port offset in the <B>/usr/afs/backup/tapeconfig</B> file, if the
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tape was never labeled). For further description, see the <B>backup
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dump</B> reference page.
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<P>The Tape Coordinator's default response to this command is to access
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the tape by invoking the <B>MOUNT</B> instruction in the local
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<B>/usr/afs/backup/CFG_</B><VAR>device_name</VAR> file, or by prompting the
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backup operator to insert the tape if there is no <B>MOUNT</B>
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instruction. However, if the <B>AUTOQUERY NO</B> instruction
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appears in the <B>CFG_</B><VAR>device_name</VAR> file, or if the issuer of
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the <B>butc</B> command included the <B>-noautoquery</B> flag, the
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Tape Coordinator instead expects the tape to be in the device already.
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If it is not, the Tape Coordinator invokes the <B>MOUNT</B> instruction or
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prompts the operator.
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<P><STRONG>Options</STRONG>
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<DL>
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<P><DT><B>-name
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</B><DD>Specifies the AFS tape name to record on the label. Include this
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argument or the <B>-pname</B> argument, but not both. If this
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argument is omitted, the AFS tape name is set to <TT><NULL></TT>.
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If this argument is provided, it must have the following format:
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<PRE> <VAR>volume_set_name</VAR>.<VAR>dump_level_name</VAR>.<VAR>tape_index</VAR>
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</PRE>
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<P>for the tape to be acceptable for use in a future <B>backup dump</B>
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operation. The <VAR>volume_set_name</VAR> must match the volume set name
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of the initial dump to be written to the tape, <VAR>dump_level_name</VAR> must
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match the last element of the dump level pathname at which the volume set will
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be dumped, and <VAR>tape_index</VAR> indicates the order of the tape in the dump
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set (indexing begins with <B>1</B>). To disable this type of name
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checking, include the <B>NAME_CHECK NO</B> instruction in the
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<B>CFG_</B><VAR>device_name</VAR> file.
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<P>For the tape to be acceptable for use in a future <B>backup savedb</B>
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operation, the value specified for the <B>-name</B> argument must have the
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following format:
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<PRE> <B>Ubik_db_dump.</B><VAR>tape_index</VAR>
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</PRE>
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<P>where <VAR>tape_index</VAR> indicates the order of the tape in the set of
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tapes that house the Backup Database dump; indexing begins with 1
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(one).
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<P><DT><B>-size
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</B><DD>Specifies the tape capacity to record on the label. Provide an
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integer value followed by a letter that indicates units, with no intervening
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space. A unit value of <B>k</B> or <B>K</B> indicates
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kilobytes, <B>m</B> or <B>M</B> indicates megabytes, and <B>g</B>
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or <B>G</B> indicates gigabytes. If the units letter is omitted,
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the default is kilobytes.
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<P>If this argument is omitted the first time a tape is labeled, the Backup
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System records the capacity that is associated with the specified port offset
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in the <B>/usr/afs/backup/tapeconfig</B> file on the Tape Coordinator
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machine. The value recorded the first time then persists until the
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<B>-size</B> argument is provided on a future issuance of the
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command.
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<P><DT><B>-portoffset
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</B><DD>Specifies the port offset number of the Tape Coordinator handling the tape
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for this operation.
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<P><DT><B>-pname
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</B><DD>Specifies the permanent name to record on the label. It can be up
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to 32 characters in length, and include any alphanumeric characters.
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Avoid metacharacters that have a special meaning to the shell, to avoid having
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to mark them as literal in commands issued at the shell prompt.
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<P>Include this argument or the <B>-name</B> argument, but not
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both. If this argument is provided, the AFS tape name is set to
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<TT><NULL></TT>. If this argument is omitted, any existing
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permanent name is retained.
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<P><DT><B>-localauth
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</B><DD>Constructs a server ticket using a key from the local
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<B>/usr/afs/etc/KeyFile</B> file. The <B>backup</B> command
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interpreter presents it to the Backup Server, Volume Server and VL Server
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during mutual authentication. Do not combine this flag with the
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<B>-cell</B> argument. For more details, see the introductory
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<B>backup</B> reference page.
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<P><DT><B>-cell
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</B><DD>Names the cell in which to run the command. Do not combine this
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argument with the <B>-localauth</B> flag. For more details, see the
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introductory <B>backup</B> reference page.
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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 records the AFS tape name
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<B>user.monthly.1</B> on the label of the tape in the device
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with port offset 3:
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<PRE> % <B>backup labeltape -name user.monthly.1 -portoffset 3</B>
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</PRE>
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<P>The following three commands are equivalent in effect: they all
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record a capacity of 2 GB on the label of the tape in the device with port
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offset 4. They set the AFS tape name to <TT><NULL></TT> and leave
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the permanent name unchanged.
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<PRE> % <B>backup labeltape -size 2g -portoffset 4</B>
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% <B>backup labeltape -size 2048M -portoffset 4</B>
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% <B>backup labeltape -size 2097152 -portoffset 4</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 is running, or must be logged onto a
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server machine as the local superuser <B>root</B> if the
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<B>-localauth</B> flag is included.
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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="auarf060.htm#HDRBK_INTRO">backup</A>
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<P><A HREF="auarf084.htm#HDRBK_READLABEL">backup readlabel</A>
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<P><A HREF="auarf126.htm#HDRBUTC">butc</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="auarf078.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="auarf080.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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