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Re: [Linux-cluster] Two clusters in the network with same "name" in cluster.conf



Hi Laszlo,

Thanks for detailed information however I tried below but without success.

Thanks,
Parvez

On Wed, Mar 28, 2012 at 1:16 PM, Budai Laszlo <laszlo budai gmail com> wrote:
Hi,

if you RAELLY need two clusters with the same name on the same subnet,
then try to adjust the following parameters and use unique values for
each cluster:

/Multicast network configuration/
   cman uses multicast UDP packets to communicate with other nodes in
   the cluster. By default it will generate a multicast address using
   239.192.x.x where x.x is the 16bit cluster ID number split into
   bytes. This, in turn is generated from a hash of the cluster name
   though it can be specified explicitly. The purpose of this is to
   allow multiple clusters to share the same subnet - they will each
   use a different multicast address. You might also/instead want to
   isolate clusters using the port number as shown above.

   It is possible to override the multicast address by specifying it in
   cluster.conf as shown:

   <cman> <multicast addr="229.192.0.1"/> </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>

Kind regards,
Laszlo

On 03/28/2012 09:14 AM, Parvez Shaikh wrote:
> Hi experts,
>
> I am running in to a problem in a situation where two clusters in the
> network have same name.
>
> Node A, Node B : cluster name CLUSTER
> Node C, Node D : cluster name CLUSTER
>
> Node C and Node D's cluster is running fine however when I start node
> A it copies /etc/cluster.conf (I believe ccsd) from either C and D and
> replaces its own and start attempting a cluster, of course it fails
> because C or D is not a host name of node A.
>
> Is it possible to have more than one clusters in same network, these
> nodes are in IBM blades hosted in Bladecenter and the heart beat IPs
> are on private network.
>
> Thanks
>
>
>
>
>


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