On 12.10.2012 01:30, Phil Stracchino wrote:
> I'm not planning to actually try this, but I'm curious to know whether
> anyone has ever tried a corner case like this one, and if so, what happened.
>
Having two directors use a common set of file and storage-daemons is not
a problem as long as the directors have different names, use different
databases, and different sets of media. If both directors are requesting
a resource, one of them will wait until the resource is free again, and
they will never attempt to write onto the same medium.
Letting two copies of the same director configuration run on different
hosts will blow up spectacularly. Using the same database for both will
corrupt your catalog, because director A will be "unaware" of database
updates that director B did while it wasn't looking, leading to an
inconsistent state that you most likely won't be able to recover from :)
There will also be error messages and crashes because of duplicate keys,
and both directors no longer knowing what state their in.
Even if you ran a second copy of the director under a different name and
an independant copy of your database, you will still run into problems.
Since you effectively have the same media listed in two catalogs, both
directors will end up overwriting each other's media in non-predictable
ways.
So in short: You should REALLY avoid this case :) When switching from
the old director to the new one, shut down the old one, and to be sure
to reconfigure it in a way it can't accidently be restarted. (Happened
to me once, not with bacula, but a similar migration scenario - someone
else who didn't know about a migration going on saw a server going down
in Nagios and thought he'd do us a favour by restarting it. Big Mistake :) )
Best Regards,
Sven
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