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=head1 NAME
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vldb.DB0, vldb.DBSYS1 - Contain the Volume Location Database and associated log
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=head1 DESCRIPTION
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2005-12-14 01:30:20 +00:00
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The file F<vldb.DB0> 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 (B<vlserver> process) provides
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information from the database to Cache Managers when they need to access
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AFS data.
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The file F<vldb.DBSYS1> 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.
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Both files are in binary format and reside in the F</usr/afs/db> 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.
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Always use the commands in the B<vos> 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 B<tar> command.
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2005-12-08 12:14:33 +00:00
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=head1 SEE ALSO
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2005-12-14 01:30:20 +00:00
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L<vldb_check(8)>,
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L<vlserver(8)>,
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L<vos(1)>
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=head1 COPYRIGHT
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IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
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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.
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