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prdb.DB0(5)

NAME

   prdb.DB0, prdb.DBSYS1 - Contain the Protection Database and associated
   log

DESCRIPTION

   The prdb.DB0 file contains the Protection Database, which maps AFS
   user, machine, and group names to their respective IDs (AFS UIDs and
   GIDs) and tracks group memberships. The Protection Server (ptserver
   process) uses the information in the database to help the File Server
   grant data access to authorized users.

   The prdb.DBSYS1 file is a log file in which the Protection Server logs
   each database operation before performing it.  When an operation is
   interrupted, the Protection Server replays the log to complete the
   operation.

   Both files are in binary format and reside in the /var/lib/openafs/db
   directory on each of the cell's database server machines. When the
   Protection Server starts or restarts on a given machine, it establishes
   a connection with its peers and verifies that its copy of the database
   matches the copy on the other database server machines. If not, the
   Protection Servers call on AFS's distributed database technology, Ubik,
   to distribute to all of the machines the copy of the database with the
   highest version number.

   Always use the commands in the pts suite to administer the Protection
   Database. It is advisable to create an archive copy of the database on
   a regular basis, using a tool such as the UNIX tar command.

SEE ALSO

   prdb_check(8), pts(1), ptserver(8)

COPYRIGHT

   IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

   This documentation is covered by the IBM Public License Version 1.0.
   It was converted from HTML to POD by software written by Chas Williams
   and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.



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