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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="auarf248.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="auarf250.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="HDRVLSERVER" HREF="auarf002.htm#ToC_263">vlserver</A></H2>
-<A NAME="IDX5560"></A>
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-<P><STRONG>Purpose</STRONG>
-<P>Initializes the Volume Location Server
-<P><STRONG>Synopsis</STRONG>
-<PRE><B>vlserver</B> [<B>-p</B> <<VAR>lwp processes</VAR>>] [<B>-nojumbo</B>]
- [<B>-enable_peer_stats</B>] [<B>-enable_process_stats</B>] [<B>-help</B>]
-</PRE>
-<P>This command does not use the syntax conventions of the AFS command
-suites. Provide the command name and all option names in full.
-<P><STRONG>Description</STRONG>
-<P>The <B>vlserver</B> command initializes the Volume Location (VL)
-Server, which runs on every database server machine. In the
-conventional configuration, its binary file is located in the
-<B>/usr/afs/bin</B> directory on a file server machine.
-<P>The <B>vlserver</B> command is not normally issued at the command shell
-prompt but rather placed into a file server machine's
-<B>/usr/afs/local/BosConfig</B> file with the <B>bos create</B>
-command. If it is ever issued at the command shell prompt, the issuer
-must be logged onto a database server machine as the local superuser
-<B>root</B>.
-<P>As it initializes, the VL Server process creates the two files that
-constitute the Volume Location Database (VLDB), <B>vldb.DB0</B> and
-<B>vldb.DBSYS1</B>, in the <B>/usr/afs/db</B> directory if they
-do not already exist. Use the commands in the <B>vos</B> suite to
-administer the database.
-<P>The VL Server maintains the record of volume locations in the Volume
-Location Database (VLDB). When the Cache Manager fills a file request
-from an application program, it first contacts the VL Server to learn which
-file server machine currently houses the volume that contains the file.
-The Cache Manager then requests the file from the File Server process running
-on that file server machine.
-<P>The VL Server records a trace of its activity in the
-<B>/usr/afs/logs/VLLog</B> file. Use the <B>bos getlog</B>
-command to display the contents of the file. By default, it records on
-a minimal number of messages. For instructions on increasing the amount
-of logging, see the <B>VLLog</B> reference page.
-<P>By default, the VL Server runs nine lightweight processes (LWPs). To
-change the number, use the <B>-p</B> argument.
-<P><STRONG>Options</STRONG>
-<DL>
-<P><DT><B>-p
-</B><DD>Sets the number of server lightweight processes (LWPs) to run.
-Provide an integer between <B>4</B> and <B>16</B>. The default
-is 9.
-<P><DT><B>-nojumbo
-</B><DD>Prohibits the server from sending or receiving jumbograms. A
-jumbogram is a large-size packet composed of 2 to 4 normal Rx data packets
-that share the same header. The VL Server uses jumbograms by default,
-but some routers are not capable of properly breaking the jumbogram into
-smaller packets and reassembling them.
-<P><DT><B>-enable_peer_stats
-</B><DD>Activates the collection of Rx statistics and allocates memory for their
-storage. For each connection with a specific UDP port on another
-machine, a separate record is kept for each type of RPC (FetchFile, GetStatus,
-and so on) sent or received. To display or otherwise access the
-records, use the Rx Monitoring API.
-<P><DT><B>-enable_process_stats
-</B><DD>Activates the collection of Rx statistics and allocates memory for their
-storage. A separate record is kept for each type of RPC (FetchFile,
-GetStatus, and so on) sent or received, aggregated over all connections to
-other machines. To display or otherwise access the records, use the Rx
-Monitoring API.
-<P><DT><B>-help
-</B><DD>Prints the online help for this command. All other valid options
-are ignored.
-</DL>
-<P><STRONG>Examples</STRONG>
-<P>The following <B>bos create</B> command creates a <B>vlserver</B>
-process on the machine <B>fs2.abc.com</B> that uses six
-lightweight processes. Type the command on a single line:
-<PRE> % <B>bos create -server fs2.abc.com -instance vlserver -type simple</B> \
- <B>-cmd "/usr/afs/bin/vlserver -p 6"</B>
-</PRE>
-<P><STRONG>Privilege Required</STRONG>
-<P>The issuer must be logged in as the superuser <B>root</B> on a file
-server machine to issue the command at a command shell prompt. It is
-conventional instead to create and start the process by issuing the <B>bos
-create</B> command.
-<P><STRONG>Related Information</STRONG>
-<P><A HREF="auarf016.htm#HDRBOSCONFIG">BosConfig</A>
-<P><A HREF="auarf038.htm#HDRVLLOG">VLLog</A>
-<P><A HREF="auarf051.htm#HDRVLDBDB">vldb.DB0 and vldb.DBSYS1</A>
-<P><A HREF="auarf098.htm#HDRBOS_CREATE">bos create</A>
-<P><A HREF="auarf102.htm#HDRBOS_GETLOG">bos getlog</A>
-<P>
-<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="auarf248.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="auarf250.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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