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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="auarf050.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="auarf052.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="HDRVLDBDB" HREF="auarf002.htm#ToC_49">vldb.DB0 and vldb.DBSYS1</A></H2>
-<P><STRONG>Purpose</STRONG>
-<A NAME="IDX4030"></A>
-<A NAME="IDX4031"></A>
-<A NAME="IDX4032"></A>
-<A NAME="IDX4033"></A>
-<A NAME="IDX4034"></A>
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-<P>Contain the Volume Location Database and associated log
-<P><STRONG>Description</STRONG>
-<P>The file <B>vldb.DB0</B> contains the Volume Location Database
-(VLDB), which tracks the location of all AFS volumes stored on file server
-machines in the cell. The Volume Location (VL) Server
-(<B>vlserver</B> process) provides information from the database to Cache
-Managers when they need to access AFS data.
-<P>The file <B>vldb.DBSYS1</B> is a log file in which the VL Server
-logs each database operation before performing it. When an operation is
-interrupted, the VL Server replays the log to complete the operation.
-<P>Both files are in binary format and reside in the <B>/usr/afs/db</B>
-directory on each of the cell's database server machines. When the
-VL Server starts or restarts on a given machine, it establishes a connection
-with its peers and verifies that its copy of the database matches the copy on
-the other database server machines. If not, the VL Servers call on
-AFS's distributed database technology, Ubik, to distribute to all of the
-machines the copy of the database with the highest version number.
-<P>Always use the commands in the <B>vos</B> suite to administer the
-VLDB. It is advisable to create an archive copy of the database on a
-regular basis, using a tool such as the UNIX <B>tar</B> command.
-<P><STRONG>Related Information</STRONG>
-<P><A HREF="auarf248.htm#HDRVLDB_CHECK">vldb_check</A>
-<P><A HREF="auarf249.htm#HDRVLSERVER">vlserver</A>
-<P><A HREF="auarf252.htm#HDRVOS_INTRO">vos</A>
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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="auarf050.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="auarf052.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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