[DRBD-user] 3 simple questions for a nifty setup
Lars.Ellenberg at linbit.com
Wed Aug 24 21:23:12 CEST 2005
/ 2005-08-24 20:01:58 +0100
> > > Sorry, I missed the bit earlier about having multiple secondaries in drbd.
> > >
> > > As you know, I had assumed that this is not possible with 0.7, but I don't
> > > recall exactly why.
> > in short, because reliable multicast is tricky.
> I have only heard of it.
> Do you get all the magic out of the networking or do you have to do
> more work in drbd itself ?
to my knowledge, there currently is no (at least no open source)
implementation of such a thing that would be usable by drbd.
yes, we pretty much would have to (re)invent it ourselves.
> > we have paying customers where we do a "tripple legged, two secondary" setup,
> > but that is currently no so much for availability than for desaster recovery
> > backup purposes.
> What happens at fail-over ? are they primary/secondary/tertiary ?
buy it, and I'll tell you :->
well, basically, in case they'd need the "tertiary", what would happen is,
they phone us, and we do the tricky bit. *g*
as I said, the "tertiary" is for desaster recovery, not for "high"
availability, so in case it is needed, there already has been a
desaster, and the additional latency of getting us involved is ok
compared to everything else.
you really do not want to have automatic failover to a distant data center
just because heartbeat feels like it...
: Lars Ellenberg Tel +43-1-8178292-0 :
: LINBIT Information Technologies GmbH Fax +43-1-8178292-82 :
: Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com :
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