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Re: [Linux-cluster] How can I re-assign cluster id



Pedro Gonzalez Zamora wrote:
Dear Christine

I have set <cman cluster_id="1470"/> and I trying again but I get this error:

cman: unable to set cluster_id

Could you tell me please more about cluster name hash, how it works and how can I change the values?


It sounds like you must have a rather old RHEL4 installation - the cluster_id changing code has been in there for a very long time now.

The 'trick' to making the cluster names hash to unique values is simply to make the names very different really. Avoid long, similar, names that end in numbers for example.


2008/8/5 Christine Caulfield <ccaulfie redhat com <mailto:ccaulfie redhat com>>

    Pedro Gonzalez Zamora wrote:

        Dear all


        I have two clusters each cluster has two nodes, the first
        cluster1 starts ok but de second cluster2 can't start because it
        gets the same cluster ID that cluster1 and I don't know why??
        I have set diferent cluster name in cluster.conf.


    It's probably that you've hit a weakness with the cluster name hash,
    it's not perfect by any means. Your options are to change one of the
    cluster names so that they hash to different values or (easier) add

    <cman cluster_id="XXX/>

    to one or both of the cluster.conf files to force a different
    cluster ID number.


    Chrissie

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