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

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