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prdb.DB0, prdb.DBSYS1 - Contain the Protection Database and associated
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
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.
prdb_check(8), pts(1), ptserver(8)
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
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