[Pacemaker] Andrew and Lars please confirm this.

[Romi Verma]

On Mon, Mar 2, 2009 at 1:22 PM, Romi Verma <romi3rdfeb at gmail.com> wrote:

> 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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>> >
>> >
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