[Linux-cluster] Can same cluster name in same subnet?

Steven Dake sdake at redhat.com
Tue Mar 31 06:12:55 UTC 2009

You can have the same cluster name and override the multicast address as
well.  The multicast address is the unique identifier for the cluster,
not the cluster name.  The cluster name hashes into a multicast address
in a deterministic fashion on all nodes with the same cluster id.  This
means they will conflict if they have a differing configuration.


On Tue, 2009-03-31 at 01:10 -0500, Vu Pham wrote:
> Chen Ming wrote:
> > Hi,
> > 
> > I setup two cluster in same subnet, using the same name, it seems the 
> > later cluster can not startup. I try to start cman but failed. My 
> > environment is RHEL 5.3.
> > 
> > My question: Is it possible to use the same cluster name in same subnet?
> > 
>  From the man page of cman
> -----------------
> Cluster ID
>         The  cluster  ID number is used to isolate clusters in the same 
> subnet.
>         Usually it is generated from a hash of the cluster name, but it 
> can  be
>         overridden  here if you feel the need. Sometimes cluster names 
> can hash
>         to the same ID.
>           <cman cluster_id="669">
>           </cman>
> -----------------
> So I think you either have to use different names or to explicitly 
> specify different cluster_id.
> But why do you have to have the same cluster name in the first place ?
> Vu
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