On Thursday 05 January 2006 11:06, Michael 'buk' Scherer wrote:
> On Thu, 5 Jan 2006 - 10:34am, Kern Sibbald wrote:
> >> >Third hint. I *strongly* recommend running with "Always Open = yes".
> >> > It saves *lots* of wear and tear on your drives/tapes.
> >>
> >> Just a short question with that. We currently get the tapes ejected with
> >> the last job during the night. How would I do that with AlwaysOpen=yes?
> >> A simple 'unmount storage=LTO' on the console?
> >
> >I'm not 100% sure exactly what you are doing, so my response may not be
> >correct, but I don't think any of your procedures will change by having
> >AlwaysOpen=yes. If you set it to No, then after every job, Bacula
> > releases the drive, and thus the tape will be rewound and repositioned
> > when the next job starts. With AlwaysOpen=yes, the tape remains properly
> > positioned between jobs. If you want to change tapes, you either need to
> > make Bacula do it automatically with one of its multitude of directives,
> > or you must explicitly unmount the drive, which will cause the tape to be
> > released.
>
> If Bacula releases /dev/nst0, e.g. a non-rewinding tape, that doesnt
> matter. The tape will keep its position as long as no rewind or offline is
> executed.
True, but the very first thing that Bacula *always* does after opening a drive
is to rewind it, otherwise it cannot be sure where the tape is positioned.
So the effect is the same.
>
> >> If yes, do I need to execute a 'mount storage=LTO' after I changed tapes
> >> and run 'update slots storage=LTO' afterwards, which (if yes) would mean
> >> to me, that I'd have to load a tape 'by hand' running 'mtx load.
> >
> >I find it hard to answer this question because if you are using an
> >autochanger, then there is no need to mount/unmount drives. The
> > autochanger code will do it for you automatically. The only case where
> > you would do that is if you want to change the magazine, then you do
> > something like:
> >
> > unmount storage=xxx
> > (remove and replace magazine)
> > update slots storage=xxx
> > mount storage=xxx
> >
> >In this case, it is manual because you need to physically remove the
> > magazine.
>
> Ok, bigger explanation.
> At first, we don't have a magazin. I have a changer, when I open its door
> there are 6 slots where I can throw tapes in. So I can change a single one
> or all or ... you get the idea. Besides that the device as one tapedrive
> included.
>
> Currently we are using 2 tapes on a daily basis and on friday we put two
> more in for the weekend backup.
>
> Though we are working with UseDuration and RetentionTime we change tapes on
> a daily basis and store them outside the datacenter. Also theres a printout
> created from the bacula.log that needs to be checked and stored in a
> folder. Printout contains the jobs of the last 24h and the bootstrap file
> for the CatalogBackup.
> If someone wants it, gimme a mail.
>
> Soooo, back to the "problem". As a matter of fact, we change tapes every
> morning and therefor run an 'mtx inventory' and an 'update slots' after
> that. Before switching to 1.38.2 we used AlwaysOpen=no and simply unloaded
> the tape with the RunAfterJob. In the morning we put 2 new tapes in,
> cronjob at 7pm runs 'update slots', the tapes are purged hopefully and will
> be used during the night.
OK, that is clear enough.
>
> Now my question, again, when I execute 'unmount storage=LTO' with the
> RunAfterJob, what do I have to do to satisfy Baculas needs after I changed
> the tapes?
> - mtx inventory
> - update slots storage=LTO
> - mount storage=LTO
> => which should throw an error cause theres no tape loaded in the drive,
> cause I expect Bacula to examine what tapes are there and therefor pick the
> right one. Examination works good as "status director" is showing me.
I'm not 100% sure about the need for the mtx inventory, but I guess it is safe
to do. In my case, the autochanger always does an inventory itself after any
change of tapes, so you might be able to leave that step out -- what counts
is that the autochanger is aware of what it has internally.
The above should work fine. Bacula may complain that there is no tape when
you issue the mount command, but that is not a problem. When the first job
starts, Bacula should make the changer mount a tape that it wants ...
>
> Ok, did I baffle you enough? good. ;)
No, that was very clear :-)
--
Best regards,
Kern
(">
/\
V_V
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