[Linux-cluster] takeover, fencing & failback

[John Ruemker]

Gerhard Spiegl wrote:
> Hi all,
>
> I'm working on a two node cluster (RHEL 5.2 + RHCS) with one
> XEN virtual machine per node:
>
> node1 => VM1
> node2 => VM2
>
> When node1 takes over VM2 via the command:
>
> clusvcadm -M vm:VM2 -m node1
>
> node2 gets fenced after takeover is done, which is probably expected behaviour.
>   

This is not expected.  The vm should migrate and both nodes should 
continue running.

> As node2 comes up again it fetches his VM2 back (nofailback="0", but also
> fences node1 (ipmilan) where VM1 is still running an therefore interrupted and 
> restartet on node2.
> When node1 comes up the same game in the other direction begins.
> Is there a way to avoid this fence loop?
>
> In other words: can a service be migrated from node1 to node2 without other
> services that run on node1 being interrupted?
>   

Are both nodes successfully joined in the cluster?  What does 'cman_tool 
nodes' say?  Can you attach logs showing all of this happening?


John