[Ocfs2-users] dlm questions

[Sunil Mushran]

Only way this can work is if all 4 nodes are part of the same
cluster as that is a prerequisite for the nodes to be in the
same dlm domain. And nodes have to be part of the same
domain inorder to coordinate locking on a resource.

Meaning sharing a volume between two clusters is asking
for corruption. Actually, I don't think you will be able to get
this to even work as either mount will fail or heartbeat will
fence with the "another node is heartbeating in my slot".

Charlie Sharkey wrote:
> I have an application I run on the nodes of a cluster. This
> application used the dlm for file locking between the nodes by 
> calling o2dlm_initialize() to create a domain, and then o2dlm_lock()
> and o2dlm_unlock() to lock/unlock files. This works fine, and
> the locks are seen by the other nodes.
>
> I was wondering on the viability of two clusters accessing the
> same volume, and seeing each others locks.
>
> Say I have two (2 node) clusters, A and B. Each cluster is on a private 
> network within itself, and they are identical. This means each cluster 
> will have a system host1 on 10.1.1.1 and a system host2 on 10.1.1.2 .
>
>   1. first of all, would this configuration even work ? If not,
>      would it work if the clusters had different cluster names, 
>      host names, ip addresses ?
>
>   2. can a node on cluster A see a dlm lock from cluster B ?
>      note there is no IP connection between the clusters.
>      
>   3. is there any way to make one cluster aware of a different cluster
>      that is ip connected (one with a different cluster name, host
> names, 
>      ip addresses, same/different dlm domain names) ?  
>
> Thank you,
>
> charlie
>
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