Re: Clusterwide pids

["David L. Nicol" <dnicol@cstp.umkc.edu>]

Greg Freemyer wrote:

> I was not trying to imply that one node could be simultaneously a member of a PVM cluster and a SSI for Linux Cluster.  That seems way beyond the current scope of things.  I guess it is conceivable that with enough common infrastructure it could be done, but I would not consider that a design goal.

I consider that a design goal.  A possible way to have simultaneous
operations of
incompatible systems sharing the same hardware might be to run them each in
their
own UML (User Mode Linux) sandboxes.


> What I was concerned about is that each of the membership algorithms and implementations has its own idiosyncrasies and we would need to insure that a CPID module would not have to know which membership algorithm it was working with.

Agreed.  the "what node is this?" function needs to be fully abstracted, to
the point where it would be possible to have one node be in several
differnt
clusters (with different numbers for itself) and it will give the correct
CPID depending on who is asking -- since the asking entity will provide the
context for determining the node-ID part of the CPID.


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