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-<H1>Administration Reference</H1>
-<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="auarf129.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="auarf131.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>
-<P>
-<H2><A NAME="HDRFMS" HREF="auarf002.htm#ToC_144">fms</A></H2>
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-<P><STRONG>Purpose</STRONG>
-<P>Determine a tape's capacity and a tape device's filemark size
-<P><STRONG>Synopsis</STRONG>
-<PRE><B>fms -tape</B> <<VAR>tape special file</VAR>> [<B>-help</B>]
-
-<B>fms -t</B> <<VAR>tape special file</VAR>> [<B>-h</B>]
-</PRE>
-<P><STRONG>Description</STRONG>
-<P>The <B>fms</B> command determines the capacity of the tape currently in
-the tape device identified by the <B>-tape</B> argument, along with the
-size of the filemark for the device. The filemark is also referred to
-as the device's end-of-file (EOF) marker, and can differ for each
-combination of tape and tape device.
-<P>As the Tape Coordinator writes a dump, it writes a filemark between the
-data included from each volume and also tracks the amount of space left before
-the end of the tape (EOT). For some tape devices, the filemark is large
-enough (multiple megabytes) that failure to consider it leads the Tape
-Coordinator significantly to overestimate the available space.
-<P>The intended use of this command is to determine tape capacity and filemark
-size values that can be specified in a tape device's entry in the
-<B>/usr/afs/backup/tapeconfig</B> file. For certain types of tape
-drives, the Tape Coordinator operates more efficiently when the
-<B>tapeconfig</B> file lists accurate values. For further
-discussion, see the <I>IBM AFS Administration Guide</I> chapter on
-configuring the Backup System.
-<P>Insert a tape in the drive before issuing this command.
-<P><STRONG>Cautions</STRONG>
-<P>Do not use this command on compressing tape devices in compression mode or
-with tape devices that handle tapes of multigigabyte (or multiterabyte)
-capacity. It does not produce accurate results in those cases.
-For alternate suggestions on the values to record in the <B>tapeconfig</B>
-file for compressing drives, see the <I>IBM AFS Administration Guide</I>
-chapter on configuring the Backup System.
-<P>Running the command completely overwrites the tape, so use a blank one or
-one that can be recycled.
-<P>Because it writes filemarks to the complete length of the tape, the command
-can take from several hours to more than a day to complete.
-<P><STRONG>Options</STRONG>
-<DL>
-<P><DT><B>-tape
-</B><DD>Specifies the UNIX device name of the tape device for which to determine
-filemark size and the capacity of the tape it currently contains. The
-format varies on different system types, but usually begins with
-<B>/dev</B>; an example is <B>/dev/sd0a</B>.
-<P><DT><B>-help
-</B><DD>Prints the online help for this command. All other valid options
-are ignored.
-</DL>
-<P><STRONG>Output</STRONG>
-<P>The command generates output both on the standard output stream and in the
-<B>fms.log</B> file that it creates in the current working
-directory. The output reports the capacity of the tape in the device
-and the device's filemark size.
-<P>The first few lines of output include status information about the
-execution of the command, including such information as the number of blocks
-and the number of file marks written to the tape by the command. The
-last two lines of both screen and file output provide the following
-information:
-<UL>
-<P><LI><TT>Tape capacity is</TT> <VAR>number</VAR> <TT>bytes</TT>:
-specifies the size, in bytes, of the tape in the device.
-<P><LI><TT>File marks are</TT> <VAR>number</VAR> <TT>bytes</TT>:
-specifies the device's filemark size in bytes.
-</UL>
-<P>The following message indicates that the <B>fms</B> command interpreter
-cannot access the tape device. The command halts.
-<PRE> Can't open tape drive <VAR>device</VAR>
-
-</PRE>
-<P>The following message indicates that the command interpreter cannot create
-the <B>fms.log</B> log file. Again, the command
-halts.
-<PRE> Can't open log file
-
-</PRE>
-<P><STRONG>Examples</STRONG>
-<P>The following command illustrates the output for the device called
-<B>/dev/rmt1h</B>:
-<PRE> % <B>fms /dev/rmt1h</B>
- wrote block: 130408
- Finished data capacity test - rewinding
- wrote 1109 blocks, 1109 file marks
- Finished file mark test
- Tape capacity is 2136604672 bytes
- File marks are 1910205 bytes
-
-</PRE>
-<P>The following appears in the <B>fms.log</B> file:
-<PRE> fms test started
- wrote 9230 blocks
- Finished file mark test
- Tape capacity is 151224320 bytes
- File marks are 2375680 bytes
-
-</PRE>
-<P><STRONG>Privilege Required</STRONG>
-<P>The issuer must be able to insert and write to files in the currently
-working directory, if the <B>fms.log</B> file does not already
-exist. If it already exists, the issuer need only be able to write to
-it.
-<P><STRONG>Related Information</STRONG>
-<P><A HREF="auarf044.htm#HDRFMSLOG">fms.log</A>
-<P><A HREF="auarf050.htm#HDRTAPECONFIG">tapeconfig</A>
-<P>
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