On 9/17/07, Arno Lehmann <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> 18.09.2007 10:36,, Eric Böse-Wolf wrote::
> > "Hydro Meteor" <[EMAIL PROTECTED]> writes:
> >
> >> Martin,
> >>
> >> Thank you for checking my logic. I wonder if it would be worthwhile to
> the
> >> Bacula community to have some simple diagrams that accompany the User's
> Guide,
> >> such a diagram that shows a timeline and how Bacula Jobs operate along
> such a
> >> timeline? I'd be pleased contribute some graphics to the documentation
> if
> >> that's something other people would also be interested in.
>
> Personally, I don't see the need for this - the underlying logic is
> quite clear to me - but of course it might help you and others.
Probably with time if any person spends enough time with Bacula, they will
be able to navigate Bacula configuration files with much ease as they have
the logic all mapped out in their heads. The Tutorial for newcomers is
really quite nice and it does get someone up and running and testing Bacula
rather swiftly but I think that sometimes diagrams that map out abstractions
and visualize logic constructs (such as visualizing multiple Backup Level
types with a few scenarios for Full, Differential, Incremental, etc.) might
be useful. Last year I attended one of Dr. Edward Tufte's <
http://www.edwardtufte.com/tufte/ > seminars and one of the things Tufte
said in his lecture which I thought was very insightful was that different
people have different cognitive styles. In my case I probably have a
cognitive style preference for having some abstractions laid out visually.
This isn't an advertisement for Dr. Tufte's books but some of his books are
really quite good such as Beautiful Evidence, which I recommend.
As I continue to work out a Bacula operational system on my Xserve, I will
create a few timeline graphic flow charts and once I have them refined I'd
be pleased to contribute them to the Bacula Wiki and/or User's Guide.
> I would really appreciated it.
> >
> > I noticed: If I have two Jobs, both on the same Client with the same
> > FileSet but with different schedules, Bacula will make two Full Backups
> > as the individual job has never had a Full Backup before, even if the
> > other job did a Full backup a few days ago. Maybe thats something, that
> > could be mentioned, too.
>
> That's just what a job is for - a job is an independent entity and
> never refers to data from other jobs. I don't know if the manual is
> very clear on this, but again, I never had problems understanding
> this. But you are right - from time to time, people don't understand
> this, set up one job for full, one for differential, and one for
> incremental backups and wonder why it does not work as expected.
>
> Some introduction to the concepts of jobs in relation to client,
> fileset and schedule definition would probably be a good addition to
> the manual.
>
> The basic idea would be to point out that filesets, schedules and even
> client definitions can be used in many jobs, but that each job is
> independent from any other jobs and thus holds its own, complete set
> of backed up data, even though that data can overlap with the data
> from other jobs.
>
> Now someone needs to write that up in a two-page text that clearly
> describes this to novice users :-)
This conceptualization might indeed be ripe for a combined text and visual
explanation. I use tools like Visio which can export graphics in open
formats such as SVG and PDF.
Cheers!
Arno
>
> --
> Arno Lehmann
> IT-Service Lehmann
> www.its-lehmann.de
>
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