[Linux-cluster] Two nodes cluster issue without sharedstorageissue

[Jeff Sturm]

For what it's worth, considerations like these have caused us to abandon any efforts to build a 2-node cluster.

>From this point forward all our RHCS deployments will have a minimum of 3 nodes, even if the 3rd node is a small node that provides no resources and only exists for arbitration purposes.  (It was going to be that, or a quorum disk for our application, but we have no experience running a quorum disk over the long-haul in a production envrironment.)

Hope this helps someone.

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Chen, 
> Mockey (NSN - CN/Cheng Du)
> Sent: Thursday, October 23, 2008 10:36 PM
> To: linux clustering
> Subject: RE: [Linux-cluster] Two nodes cluster issue without 
> sharedstorageissue
> 
>  
> 
> >-----Original Message-----
> >From: linux-cluster-bounces at redhat.com 
> >[mailto:linux-cluster-bounces at redhat.com] On Behalf Of ext Lon 
> >Hohberger
> >Sent: 2008年10月24日 0:02
> >To: linux clustering
> >Subject: Re: [Linux-cluster] Two nodes cluster issue without shared 
> >storageissue
> >
> >On Thu, 2008-10-16 at 17:10 +0800, Chen, Mockey (NSN - CN/Cheng Du)
> >wrote:
> >> Hi,
> >> 
> >> I want to set up a two node cluster, I use active/standby
> >mode to run
> >> my service. I need even one node's hardware failure such as
> >power cut,
> >> another node still can handover from failure node and the
> >provide the
> >> service.
> >> 
> >> In my environment, I have no shared storage, so I can not 
> use quorum 
> >> disk. Is there any other way to implement it? I searched and found 
> >> 'tiebreaker IP' may feed my request, but I can not found any
> >hints on
> >> how to configure it ?
> >
> >Since you have no shared data, you may be able to run 
> without fencing. 
> >
> >That should be pretty straightforward, but you might need to comment 
> >out the "fenced" startup from the cman init script.
> >
> >In this case, the worst that will happen is both nodes will end up 
> >running the service at the same time in the event of a network 
> >partition.
> >
> >The other down side is that if the cluster divides into two 
> partitions 
> >and later merges back into one partition, I don't think 
> certain things 
> >will work right; you will need to detect this event and 
> reboot one of 
> >the nodes.
> >
> >-- Lon
> 
> I know such defects in two node cluster.  
> Since our service is mission critical, I want to know how to 
> avoid such failure case ?
> 
> Thanks.
> 
> 
> 
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