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drbd-user: Re: [DRBD-user] DRBD primary/primary for KVM - what i

Re: [DRBD-user] DRBD primary/primary for KVM - what is the best option?

From: Michael Iverson <miverson_at_nospam>
Date: Tue May 11 2010 - 13:15:34 GMT
To: Bart Coninckx <bart.coninckx@telenet.be>

I've done about zero research into this, but perhaps you could run two
separate daemon instances, one listening on each IP.

On Tue, May 11, 2010 at 8:55 AM, Bart Coninckx <bart.coninckx@telenet.be>wrote:

> On Tuesday 11 May 2010 12:58:45 Michael Iverson wrote:
> > I'd be quite interested as well, obviously. So this is what we would
> > end up with:
> >
> > Host A is primary for drbd volume 1, and secondary for drbd volume 2.
> > It acts as an iSCSI target for whatever's on volume 1.
> >
> > Host B is primary for volume 2, and secondary for volume 1. It acts as
> > a target for whatever's on volume 2.
> >
> > If either node fails, the opposite node takes over the secondary
> > volume, and exports its fallen comrade's iSCSI targets.
> >
> > This idea could possibly be extended with Ben's approach of one DRBD
> > volume per iSCSI target. (Except that it would be in a
> > primary/secondary role, instead of primary/primary.) This would make
> > the process of rebalancing the load between the two nodes fairly
> > trivial.
> >
> > Mike
> >
> > On Tue, May 11, 2010 at 5:09 AM, Bart Coninckx <bart.coninckx@telenet.be
> >
> wrote:
> > >> It is. I'm planning to showcase this in one of our upcoming webinars.
> > >>
> > >> Cheers,
> > >> Florian
> > >
> > > Excellent, any timeframe on this? As it happens I'm dealing with a
> setup
> > > now that could definitely benefit from this.
> > >
> > > B.
> > > _______________________________________________
> > > drbd-user mailing list
> > > drbd-user@lists.linbit.com
> > > http://lists.linbit.com/mailman/listinfo/drbd-user
> >
>
> Agreed, but what might be less trivial is to convince a running IETD target
> to
> have the config for the "other" targets merged to the existing targets and
> at
> the same time bind to the new secondary IP address, preferably while not
> breaking running operation. This all should be taken care of by Heartbeat.
>
> I'm going to try to dive into the challenge and report back to the list,
> unless the webinar would happen fairly soon.
>
>
> B.
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>

-- Dr. Michael Iverson Director of Information Technology Hatteras Printing

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