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42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
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=head1 NAME
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vldb.DB0 and vldb.DBSYS1 - Contain the Volume Location Database and associated log
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=head1 DESCRIPTION
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The file vldb.DB0 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> process) provides information from the database to Cache
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Managers when they need to access AFS data.
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The file vldb.DBSYS1 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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Both files are in binary format and reside in the /usr/afs/db
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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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Always use the commands in the vos 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> command.
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=head1 SEE ALSO
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L<vldb_check(1)>,
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L<vlserver(1)>,
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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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