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

[Vu Pham]

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 !!!

Vu

> 
> Regards
> -steve
> 
> 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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