[Linux-cluster] Can two clusters have same name?

Chaitanya Kulkarni chattygk at gmail.com
Mon Mar 16 08:16:06 UTC 2009

Thanks for your reply Chrissie.

But is this, i.e. deployment of clusters with same name, a valid scenario?
How often (as in say 1 in a 100) may I see such deployments, if at all?


On Mon, Mar 16, 2009 at 1:28 PM, Chrissie Caulfield <ccaulfie at redhat.com>wrote:

> Chaitanya Kulkarni wrote:
> > Hi All,
> >
> > What happens if in the same network, we try to create two clusters with
> > the same name?
> >
> > Does it cause any problem?
> At best the two clusters will merge into one, at worst you will get node
> evictions because of clashes between node IDs
> Actually you *can* do this if you change the cluster_id/multicast
> address or port number in cluster.conf. But need to be careful and it is
> not recommended.
> The main reason I say not to do this is that GFS volumes have the
> cluster name embedded in the super block. If you have two clusters with
> the same cluster name on the same SAN then it's going to be very easy to
> totally corrupt the GFS filesystem by mounting it on two different
> clusters.
> Chrissie
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