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Full Discussion: Strange difference in file size when copying LARGE file..
Special Forums Hardware Filesystems, Disks and Memory Strange difference in file size when copying LARGE file.. Post 302075489 by 0ktalmagik on Saturday 3rd of June 2006 07:00:14 PM
Old 06-03-2006
Strange difference in file size when copying LARGE file..
Hi, Im trying to take a database backup. one of the files is 26 GB. I am using cp -pr to create a backup copy of the database. after the copying is complete, if i do du -hrs on the folders i saw a difference of 2GB.

The weird fact is that the BACKUP folder was 2 GB more than the original one!

when i did du -hrs * inside each of the 2 folders and compared the output, i found the culprit. it was a file temp.dbf which was 26 GB on the source(original) folder and 28 GB in the BACKUP folder. I tried the copy procedure twice and I am getting the same result.

does anyone have any explanation for this. please let me know. I want to make sure everything is right here in the copy.

PS:- Solaris SPARC 23 BIT.

Thanks
 

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LEARN ABOUT REDHAT

bdb.db0

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

NAME

       bdb.DB0, bdb.DBSYS1 - Contain the Backup Database and associated log

DESCRIPTION

       The bdb.DB0 file contains the Backup Database, which records configuration information used by the AFS Backup System along with cross-
       indexed records of the tapes created and volumes dumped using the Backup System commands.

       The bdb.DBSYS1 file is a log file in which the Backup Server (buserver process) logs each database operation before performing it. When an
       operation is interrupted, the Backup 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 database server machine that runs the Backup
       Server.	When the Backup Server starts or restarts on a given machine, it establishes a connection with its peers and verifies that its
       copy of the bdb.DB0 file matches the copy on the other database server machines. If not, the Backup Servers use AFS's distributed database
       technology, Ubik, to distribute to all of the machines the copy of the database with the highest version number.

       Use the commands in the backup suite to administer the Backup Database. It is advisable to create a backup copy of the bdb.DB0 file on tape
       on a regular basis, using the UNIX tar command or another local disk backup utility.

SEE ALSO

       backup(8), backup_savedb(8), buserver(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								BDB.DB0(5)
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