Kern Sibbald wrote: > 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. >
OK. I had thought that with Max Volume Jobs = 1 there could only be one job writing to a volume, since a device can have only one volume mounted, and that any other jobs would have to wait on the device because they would require a different volume. So Maximum Concurrent Jobs = 1 in the Storage resource will always prevent interleave? > >> 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 > > ------------------------------------------------------------------------- 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
