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vldb.DB0(5)


NAME

   vldb.DB0, vldb.DBSYS1 - Contain the Volume Location Database and
   associated log

DESCRIPTION

   The file vldb.DB0 contains the Volume Location Database (VLDB), which
   tracks the location of all AFS volumes stored on file server machines
   in the cell. The Volume Location (VL) Server (vlserver process)
   provides information from the database to Cache Managers when they need
   to access AFS data.

   The file vldb.DBSYS1 is a log file in which the VL Server logs each
   database operation before performing it. When an operation is
   interrupted, the VL 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 VL
   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 VL
   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 vos suite to administer the VLDB. 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

   vldb_check(8), vlserver(8), vos(1)

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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