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VLDB.DB0(5)		      AFS File Reference		   VLDB.DB0(5)

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

       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/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.

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

       IBM Corporation 2000. <> 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				  2016-12-14			   VLDB.DB0(5)


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