On Friday 26 June 2009 10:07:46 terryc wrote: > Silver Salonen wrote: > > On Friday 26 June 2009 02:07:58 terryc wrote: > >> Silver Salonen wrote: > >>> Eg. if we want to do ordinary Grandfather-Father-Son rotation, we > >>> create 3 different pools for every job - for full, differential and > >>> incremental backups. > >> That is not how I understand GFS system, although it is a possibility. I > >> understand it as Full, plus (incremental OR differential). > >> > >> So important clients (like secretary's machine) receive a full backup > >> each week and a differential (all changed files since full backup) > >> nightly so that in the need for recovery, it would just be a process > >> involving two tape/disk(?) for a full recovery. > >> > >> OTOH, I might do a differential (all changed files since last backup, > >> full or diff or inc) on something on something with humungous amount of > >> file changes and non-core/non-critical files to simply keep the backup > >> window small. The trade off is that every tape/disk since the full > >> backup would need to be processed for a full client recovery. > >> > >> GFS comes from having multiple complete BACKUPS, i.e. dated versions. > >> This makes it a real backup system. > > > > OK, yes.. you may do it as this too, but the point in this context was that we > > need multiple pools. In my case I need one pool for full backups, one for > > differentials and one for incrementals. In your case you need 2 pools: one for > > fulls and one for differentials. > > No, there is no must or requirement for seperate pools. I could simply > back everything up to the one big pool and allow bacula to tell me which > tape to load next. > > As I understand it, when bacula has to run a job, it looks at which pool > it loads this job onto, checks the allocated device for a useable > tape/drive, if not there looks through its catalog for the oldest tape > and checks if it is available and if so ask you to load it. > > It is all in the config you set up. > > I have two pools based the custom of separating full and part which also > happen to be new and used tapes in this place. > > Pools lead to tape/drive efficency (like with like, similar known life > cycles) and cost reduction (minimise tapes needed) and similar.
Um.. we have different basics of our discussion - you use tapes, I use disks, so I expect Bacula to handle volumes and pools differently than in your case. -- Silver ------------------------------------------------------------------------------ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
