09-25-2009
Processes
Hi all,
I needed a little help. It's OS thing.
Suppose I have 2 machine connect over a network, I will call my machines as M1and M2.
If I copy a files from M1 to M2. What tasks are these two machine performing for copy to work.
My assumption is that M1 is performing read action and M2 is performing write action.
Are my assumption correct?
Thanks.
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LEARN ABOUT OPENDARWIN
prdb.db0
PRDB.DB0(5) AFS File Reference 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.
OpenAFS 2012-03-26 PRDB.DB0(5)