On Wednesday 14 September 2005 21:12, Mark Bober wrote:
> On Tue, Sep 13, 2005 at 07:03:56PM +0200, Arno Lehmann wrote:
> > To avoid broblems with broken network hardware :-) the Heartbeat
> > Interval setting in the configuration is a good choice.
>
> Right. I'm not too worried about it, I can make the firewall behave, and
> already have. The results are what interested me more.
>
> > The design of bacula does make it an error - the idea is that a job can
> > only be considererd good if all parties acknowledge the work was done
> > correctly.
> >
> > Although, in case of spooling, I think yuo've got a point, but if the FD
> > didn't wait for the SD to report "Everything done" how could it know
> > that the job really is written to tape completely? As bacula works
> > today, spooled data can not be despooled a second time, or even be used
> > as a bacula volume...
>
> Well, I'd think that as far as the FD is concerned, it's job was done when
> the spool-to-disk ended. (and for that matter, does the FD really
> contribute an 'opinion' about the state of a job anyway, other than to
> inform the SD/DIR it can't do something asked of it?)
>
> State really isn't kept on the FD, so it doesn't have to care if a job is
> done, once it's told to stop sending data. The SD knows it has the data,
> and that it's all correct - it is simply moving it from disk to tape at
> that point, and the FD's status shouldn't fail that portion of the backup.
> Unless the SD is able to take an error on the disk-to-tape portion, realize
> it, and request a second copy of things from the FD - that would
> necessitate a constant line of communication after the spool is done.
>
> I'm mainly thinking about laptops here, that might possibly move away once
> the user realizes that her disk isn't clicking away, and think the backup
> is done, while the spooling may still be occuring.
I see your point, but the design of Bacula (which I like and plan to keep) is
that each component sends its data and waits for a handshake saying that all
is done as you requested. Only then does it report back a success to the
Director.
Also, though it is not used, but perform multiple tasks with the SD, so it
always must wait for confirmation before proceeding ...
--
Best regards,
Kern
(">
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