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59 lines
3.8 KiB
HTML
59 lines
3.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 4//EN">
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<HTML><HEAD>
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<TITLE>Administration Reference</TITLE>
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<!-- Begin Header Records ========================================== -->
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<!-- /tmp/idwt3672/auarf000.scr converted by idb2h R4.2 (359) ID -->
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<!-- Workbench Version (AIX) on 3 Oct 2000 at 16:18:30 -->
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<META HTTP-EQUIV="updated" CONTENT="Tue, 03 Oct 2000 16:18:29">
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<META HTTP-EQUIV="review" CONTENT="Wed, 03 Oct 2001 16:18:29">
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<META HTTP-EQUIV="expires" CONTENT="Thu, 03 Oct 2002 16:18:29">
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</HEAD><BODY>
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<!-- (C) IBM Corporation 2000. All Rights Reserved -->
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<BODY bgcolor="ffffff">
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<!-- End Header Records ============================================ -->
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<A NAME="Top_Of_Page"></A>
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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="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>
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<P>
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<H2><A NAME="HDRVLDBDB" HREF="auarf002.htm#ToC_49">vldb.DB0 and vldb.DBSYS1</A></H2>
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<P><STRONG>Purpose</STRONG>
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<A NAME="IDX4030"></A>
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<A NAME="IDX4031"></A>
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<A NAME="IDX4032"></A>
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<A NAME="IDX4033"></A>
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<A NAME="IDX4034"></A>
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<A NAME="IDX4035"></A>
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<P>Contain the Volume Location Database and associated log
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<P><STRONG>Description</STRONG>
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<P>The file <B>vldb.DB0</B> contains the Volume Location Database
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(VLDB), which tracks the location of all AFS volumes stored on file server
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machines in the cell. The Volume Location (VL) Server
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(<B>vlserver</B> process) provides information from the database to Cache
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Managers when they need to access AFS data.
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<P>The file <B>vldb.DBSYS1</B> is a log file in which the VL Server
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logs each database operation before performing it. When an operation is
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interrupted, the VL Server replays the log to complete the operation.
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<P>Both files are in binary format and reside in the <B>/usr/afs/db</B>
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directory on each of the cell's database server machines. When the
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VL Server starts or restarts on a given machine, it establishes a connection
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with its peers and verifies that its copy of the database matches the copy on
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the other database server machines. If not, the VL Servers call on
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AFS's distributed database technology, Ubik, to distribute to all of the
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machines the copy of the database with the highest version number.
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<P>Always use the commands in the <B>vos</B> suite to administer the
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VLDB. It is advisable to create an archive copy of the database on a
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regular basis, using a tool such as the UNIX <B>tar</B> command.
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<P><STRONG>Related Information</STRONG>
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<P><A HREF="auarf248.htm#HDRVLDB_CHECK">vldb_check</A>
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<P><A HREF="auarf249.htm#HDRVLSERVER">vlserver</A>
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<P><A HREF="auarf252.htm#HDRVOS_INTRO">vos</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="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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<!-- Begin Footer Records ========================================== -->
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<P><HR><B>
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<br>© <A HREF="http://www.ibm.com/">IBM Corporation 2000.</A> All Rights Reserved
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</B>
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<!-- End Footer Records ============================================ -->
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<A NAME="Bot_Of_Page"></A>
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</BODY></HTML>
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