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43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
=head1 NAME
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prdb.DB0, prdb.DBSYS1 - Contain the Protection Database and associated log
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=head1 DESCRIPTION
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The F<prdb.DB0> file contains the Protection Database, which maps AFS
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user, machine, and group names to their respective IDs (AFS UIDs and GIDs)
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and tracks group memberships. The Protection Server (B<ptserver> process)
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uses the information in the database to help the File Server grant data
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access to authorized users.
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The F<prdb.DBSYS1> file is a log file in which the Protection Server logs
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each database operation before performing it. When an operation is
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interrupted, the Protection Server replays the log to complete the
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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 Protection Server
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starts or restarts on a given machine, it establishes a connection with
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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 Protection 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 B<pts> suite to administer the Protection
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Database. 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<prdb_check(8)>,
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L<pts(1)>,
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L<ptserver(8)>
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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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