On Tuesday 20 March 2007 13:02, HM wrote: > Hello, folks! > > Sorry for this ugly $subject. > > I've been playing with bacula and noticed a strange behaviour. I have > configured a Pool with disk volumes of size 100MB each. On one run I > wrote three tapes. Then I've deleted the catalog and recreated it with > the scripts shipped with bacula. On the next run bacula took the first > tape, seeked to the end and started to write another 100MB appended to > the volume resulting in volume of size 200MB. I think this is not a > user-expectable behaviour of "Maximum Volume Bytes", i.e. I think this > is a bug, no?
No, this is not a bug, and what you write above is not possible with Bacula. You have left out some information. If I literally do what you say, Bacula will *never* write to volumes that have been previously used. If it did so, it is because you specifically told it to do so (and left that out of your comments above). > > I use Maximum Volume Bytes in order to fill up my partitions as much as > possible. I've learned the folowing rule of thumb: If the partition is > under heavy load you should take care that it doesn't fill up more than > 70% (one opinion, there are others like 80%). However I'd like to use > approx 100% and then I have a fragmentation, i.e. performance, issue. > Don't you think it would be clever that bacula didn't truncate each > recycled volume file and start with size 0, but instead leave the file > allocated on disk as it is and just start over-writing from the > beginning, just as bacula would do on tape volumes? No, that is not something that I would ever implement. > > That way the disk volumes would be allocated statically on disk and one > could try to defragment it more or less appropiately once and afterwards > there would be not fragmentation added by bacula, since it doesn't need > to allocate disk blocks again and again? Bacula doesn't fragment anything. If there is any fragmentation it is because you have a strange OS that is not state of the art, or you have other tasks that are writing to the same disk. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
