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

[Chaitanya Kulkarni]

True. Anyways. Thanks for your help.

Regards,
Chaitanya

On Mon, Mar 16, 2009 at 2:07 PM, Chrissie Caulfield <ccaulfie at redhat.com>wrote:

> Chaitanya Kulkarni wrote:
> > 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?
> >
>
> Sorry, I really have no idea how many times you might see such
> deployments. How would I work it out?! Cluster names are chosen by the
> administrators ... those people are not easily predictable ;-)
>
> Chrissie
>
>
> >
> > On Mon, Mar 16, 2009 at 1:28 PM, Chrissie Caulfield <ccaulfie at redhat.com
> > <mailto: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?
> >
> >     YES LOTS!
> >
> >     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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