In response to "Support" <[EMAIL PROTECTED]>: > > I have Bacula-2.0.3 running on a dual P3 1 GHz linux system with a > 2.6.21.1 kernel. > > I have noticed that the backup rate of a client decreasing during the > backup it starts at 3,200 KB/s and slows down to 2,000 KB/s after 30 > minutes. I used Status of the Storage daemon to get the rate about every 5 > minutes. The backup was 6 GB to disc. > > I suspect the slow down may be due to the fact other jobs were waiting for > this job to finish since I ran another backup of another client and the > rate was constant during the whole backup, the difference being there were > no jobs queued to run ie waiting for the device.
No. Queued jobs do nothing to affect the speed of a backup. > Could the slow down be caused by the director polling the system and so > impacting on the storage daemon? No. The "problem" is almost certainly caused by a change in the makeup of the data being backed up. Since "status client" gives you the speed at the time you run it, that can change over time if any factors change the speed. This could be something like activity on the client contending with Bacula, or network traffic. However, it's most likely (in my experience) that you start out backing up a lot of big files, then the backup moves into directories where a lot of small files are found. 2G composed of 2 1-G files will back up faster than if it's composed of 2000 1-meg files. This is because each file has some overhead associated with writing backup records to the database. If the speed difference is enough to be of concern, you should look at optimizing whatever database backend you're using to speed up inserts. -- Bill Moran http://www.potentialtech.com ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
