[Pacemaker] quorum server

[Romi Verma]

ok, so let me summarize what i understood.
we can form a openais/pacemaker cluster whose nodes span across multiple
sites. these sites can be as close as just adjacent rooms or they can be
across continent  also.  only problem is in case of communication failure ,
openais-pacemaker does not have any solution yet.  That's why it is
recommend to have a local cluster  ( nodes sharing same rack).

am i right??

Thanks & Regards,

On Mon, Mar 2, 2009 at 12:47 PM, Andrew Beekhof <beekhof at gmail.com> wrote:

> On Mon, Mar 2, 2009 at 04:27, Romi Verma <romi3rdfeb at gmail.com> wrote:
> > Thanks Andrew and Lars,
> > I would like  to understand it bit more. , is there any distance
> parameter
> > here? i mean to say suppose i have two nodes in one room and 1 node in
> > adjacent room  , cant i form three nodes openais/pacemaker cluster here.
>
> of course.
> i believe the point is that as the distance increases, so does the
> number of switches/telcos involved and therefor the probability of a
> comms failure is between the two sites is quite high.
> as is the latency...
>
> >  i was under impression that as far as multicast ip works , nothing stops
> us
> > in forming a cluster.
> >
> > Regrards,
> >
> >
> > On Sat, Feb 28, 2009 at 12:04 AM, Lars Marowsky-Bree <lmb at suse.de>
> wrote:
> >>
> >> On 2009-02-27T13:38:02, Romi Verma <romi3rdfeb at gmail.com> wrote:
> >>
> >> > Thanks for reply Andrew,
> >> > ok, then how openais-pacemaker cluster handles the cluster whose nodes
> >> > span
> >> > across multiple sites.
> >>
> >> This is not currently handled.
> >>
> >> But deploying a split-site setup with quorumd never worked either; it is
> >> not integrated with fencing, and it is impossible to build a working
> >> split-site cluster with it. This was, I'm afraid to say, only a 40%
> >> implementation of the solution even in heartbeat/CCM land.
> >>
> >>
> >> Having proper split-site support is on the roadmap, as soon as the
> >> openAIS integration stabilizes.
> >>
> >>
> >> Regards,
> >>    Lars
> >>
> >> --
> >> Teamlead Kernel, SuSE Labs, Research and Development
> >> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
> >> "Experience is the name everyone gives to their mistakes." -- Oscar
> Wilde
> >>
> >>
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