[ClusterLabs] 2 node cluster dlm/clvm trouble

[Vladislav Bogdanov]

On 11.09.2018 16:10, Valentin Vidic wrote:
> On Tue, Sep 11, 2018 at 09:02:06AM -0400, Patrick Whitney wrote:
>> What I'm having trouble understanding is why dlm flattens the remaining
>> "running" node when the already fenced node is shutdown...  I'm having
>> trouble understanding how power fencing would cause dlm to behave any
>> differently than just shutting down the fenced node.
> 
> fences_scsi just kills the storage on the node, but dlm continues to run
> causing problems for the rest of the cluster nodes.  So it seems some
> other fence agent should be used that would kill dlm too.
> 

And that is not an easy task sometimes, because main part of dlm runs in 
kernel.
In some circumstances the only option is to forcibly reset the node.