On Monday 09 April 2007 21:22, Josh Fisher wrote: > > Kern Sibbald wrote: > > On Monday 09 April 2007 16:20, Josh Fisher wrote: > > > >> There's no reason they cannot use the same pool. They just cannot write > >> to the same volume concurrently. With a tape device, that would be a > >> problem because there can only be one volume in the tape drive. > >> > > > > True. > > > > > >> However > >> with a disk device, a volume is a file, so there can be numerous volumes > >> being written concurrently. > >> > > > > This is not true within Bacula. For each Device (tape, DVD, disk, FIFO, ...) > > Bacula has a single file descriptor thus only one Volume can be open for each > > Device, whether tape or disk. Multiple jobs can be simultanously writing to > > that Volume. However, since a Volume can be in only one Pool, and since you > > can only write to one Volume per Device, you can only be simultaneously > > writing to one Pool per Device. > > > > To simultaneously write to more than one Pool, you need multiple Devices. > > > > > > Yes. I guess I didn't phrase that very carefully. I believe Kyle has two > pools, "local_pool" and "remote_pool", and each pool is using a > different Storage resource by specifying Storage= in the Pool resource > definition. I assume the Storage resources are pointing to two different > SD devices.
OK. > In that case, specifying Maximum Volume Jobs = 1 in both of > the pools should prevent the possibility of interleaving. That's not the best way to resolve the problem, and is likely to fail because of subtle timing problems if you are running two jobs simultaneously. To prevent interleaving of blocks, either restrict the number of simultaneous jobs for that Device using any number of methods such as priorities, Max simultaneous jobs for the Storage,... , or use Spooling. > A volume from > local_pool can be written concurrently with a volume from remote_pool, > but only one job at a time can write to a local_pool volume and only one > job at a time can write to a remote_pool volume. > > >> One way is to use Maximum Volume Jobs = 1 in > >> the Pool resource definition. This will cause a new volume (ie. file) to > >> be used for each job that is run. > >> > >> Kyle Tucker wrote: > >> > >>> Hi, > >>> I have a new Bacula 2.0.2 setup and I am backing up to > >>> disk. I have remote clients that are very slow to backup and > >>> often prevent my more important local clients from being backed > >>> up due to concurrency being set to 1 as I don't want to get into > >>> the issues with interleaving as it's suggested to avoid in the > >>> warning section on concurrent jobs. > >>> I already have things so my remote clients are in separate > >>> pools and I understand I can set these pools into separate Device > >>> resources and Bacula will allow 2 concurrent jobs to run. Is there > >>> a way that I can limit the 2 concurrent jobs to not run within the > >>> same pool, causing the interleaving blocks issue? I looked at using > >>> priorities, but that didn't look like it would control what I am > >>> trying to do here. Thanks. > >>> > >>> > >>> > >> ------------------------------------------------------------------------- > >> 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 > >> > >> > > > > ------------------------------------------------------------------------- > > 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 > > > > > > > ------------------------------------------------------------------------- > 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 > ------------------------------------------------------------------------- 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
