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53 lines
2.4 KiB
XML
53 lines
2.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="vldb_DB05">
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<refmeta>
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<refentrytitle>vldb.DB0, vldb.DBSYS1</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>vldb.DB0, vldb.DBSYS1</refname>
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<refpurpose>Contain the Volume Location Database and associated log</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>The file <replaceable>vldb.DB0</replaceable> contains the Volume Location Database (VLDB), which
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tracks the location of all AFS volumes stored on file server machines in
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the cell. The Volume Location (VL) Server (<emphasis role="bold">vlserver</emphasis> process) provides
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information from the database to Cache Managers when they need to access
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AFS data.</para>
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<para>The file <replaceable>vldb.DBSYS1</replaceable> is a log file in which the VL Server logs each
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database operation before performing it. When an operation is interrupted,
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the VL Server replays the log to complete the operation.</para>
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<para>Both files are in binary format and reside in the <replaceable>/usr/afs/db</replaceable> directory
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on each of the cell's database server machines. When the VL Server starts
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or restarts on a given machine, it establishes a connection with its peers
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and verifies that its copy of the database matches the copy on the other
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database server machines. If not, the VL Servers call on AFS's distributed
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database technology, Ubik, to distribute to all of the machines the copy
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of the database with the highest version number.</para>
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<para>Always use the commands in the <emphasis role="bold">vos</emphasis> suite to administer the VLDB. It is
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advisable to create an archive copy of the database on a regular basis,
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using a tool such as the UNIX <emphasis role="bold">tar</emphasis> command.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><link linkend="vldb_check8">vldb_check(8)</link>,
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<link linkend="vlserver8">vlserver(8)</link>,
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<link linkend="vos1">vos(1)</link></para>
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</refsect1>
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<refsect1>
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<title>Copyright</title>
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<para>IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.</para>
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<para>This documentation is covered by the IBM Public License Version 1.0. It was
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converted from HTML to POD by software written by Chas Williams and Russ
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Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.</para>
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</refsect1>
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</refentry>
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