[Ocfs2-users] 2 node OCFS2 clusters

[Srinivas Eeda]

Thompson, Mark wrote:
>
> Hi Srini,
>
>  
>
> Thanks for the response.
>
>  
>
> So are the following statements correct:
>
>  
>
> If I stop the networking on node 1, node 0 will continue to allow 
> OCFS2 filesystems to work and not reboot itself.
>
>  
>
> If I stop the networking on node 0, node 1 (now being the lowest 
> node?) will continue to allow OCFS2 filesystems to work and not reboot 
> itself.
>
In both the cases node 0 will survive, because that's the node that has 
lowest node number (defined in cluster.conf). This applies to the 
scenario where interconnect went down but nodes are healthy and are 
heartbeating to the disk.
>
>  
>
> I guess I just need to know if it's possible to have a 2 node OCFS2 
> cluster that will cope with either one of the nodes dying, and have 
> the remaining node still provide service.
>
If node 0 itself panics, reboots then node 1 will survive.
>
>  
>
> Regards,
>
>  
>
> Mark
>
>  
>
> *From:* Srinivas Eeda [mailto:srinivas.eeda at oracle.com]
> *Sent:* 16 November 2009 14:57
> *To:* Thompson, Mark
> *Cc:* ocfs2-users at oss.oracle.com
> *Subject:* Re: [Ocfs2-users] 2 node OCFS2 clusters
>
>  
>
> In a cluster with more than 2 nodes, if a network on one node goes 
> down, that node will evict itself but other nodes will survive. But in 
> a two node cluster, the node with lowest node number will survive no 
> mater on which node network went down.
>
> thanks,
> --Srini
>
> Thompson, Mark wrote:
>
> Hi,
>
> This is my first post here so please be gentle with me.
>
> My question is, can you have a 2 node OCFS2 cluster, disconnect one 
> node from the network, and have the remaining node continue to 
> function normally? Currently we have a 2 node cluster and if we stop 
> the NIC that has the OCFS2 o2cb net connection running on it, the 
> other node will reboot itself. I have researched having a 2 node OCFS2 
> cluster but so far I have been unable to find a clear solution. I have 
> looked at the FAQ regarding quorum, and my OCFS2 init scripts are 
> enabled etc.
>
> Is this possible, or should we look at alternative solutions?
>
> Regards,
>
> Mark
>
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