[Linux-HA] Two-node clusters in split-sites

[Hell, Robert]

Ok, thanks I now really believe it (sorry for that).

Just to be sure that I got the third node solution right:
This would be very similar to the quorum server - quorum is calculated by the three cluster nodes. 
So if one site looses network connection, the remaining two cluster nodes have quorum because they see each other. But what is happening with the third cluster node? He stops all running resources and kills himself (fencing is not available)?

Would it be an option to use Xen VMs as "third cluster nodes" for multiple clusters on one server?
	
regards
Robert

-----Original Message-----
From: linux-ha-bounces at lists.linux-ha.org [mailto:linux-ha-bounces at lists.linux-ha.org] On Behalf Of Andrew Beekhof
Sent: Freitag, 23. Jänner 2009 09:28
To: General Linux-HA mailing list
Subject: Re: [Linux-HA] Two-node clusters in split-sites

On Fri, Jan 23, 2009 at 09:09, Hell, Robert <Robert.Hell at fabasoft.com> wrote:
> Hi,
>
> I'm wondering that quorum server doesn't work, because Alan Robertson mentioned it in his LinuxWorld 08 talk. Can someone proof that it isn't working?

I think Lars has done this in the past.

> Third node solution: I wouldn't be able to use the third machine for more than one two-node cluster, right?

correct

> -----Original Message-----
> From: linux-ha-bounces at lists.linux-ha.org [mailto:linux-ha-bounces at lists.linux-ha.org] On Behalf Of Michael Schwartzkopff
> Sent: Donnerstag, 22. Jänner 2009 13:18
> To: General Linux-HA mailing list
> Subject: Re: [Linux-HA] Two-node clusters in split-sites
>
> Am Donnerstag, 22. Januar 2009 12:32:57 schrieb Hell, Robert:
>> Hi,
>>
>>
>>
>> we are planning to run multiple two-node clusters (with different
>> functions: database cluster, samba cluster, ...) in two different sites
>> with a fast, but unreliable network connections. All cluster nodes
>> replicate data with drbd.
>>
>> I'm specially afraid of split-brain in this scenario because reliable
>> fencing is not possible in this split-site situation.
>>
>>
>>
>> After investigating multiple cluster solutions I think Linux-HA is the
>> only project which provides a solution for our problem. We want to use
>> Linux-HA with one cluster node in each site and an external quorum
>> server (as described in the Heartbeat tutorial) without fencing.
>>
>> Has anyone experiences with a solution like this and is this a solutions
>> which should work, is "supported" and is worth further investigations?
>> And last but not least: is it possible to run one quorum server for
>> multiple clusters (as mentioned before we have multiple two-node
>> clusters, but I only want to run one quorum server).
>>
>>
>>
>> Many thanks and kind regards,
>>
>> Robert
>
> Hi,
>
> as far as I know the quorum server does not work. You would have to build a
> third node and constraints to prevent resources running on that node.
>
> I would put the third node into a third location.
>
> Comments?
>
> Michael.
>
> --
> Dr. Michael Schwartzkopff
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