[Linux-cluster] Can same cluster name in same subnet?
vu at sivell.com
Tue Mar 31 06:18:45 UTC 2009
Steven Dake wrote:
> 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.
Steve, thanks for this information. Interesting !!!
> On Tue, 2009-03-31 at 01:10 -0500, Vu Pham wrote:
>> Chen Ming wrote:
>>> 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
>> 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">
>> 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 ?
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