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