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Re: [ogfs-dev]ogfs_jadd and EVMS FSIM

On Tue, 2003-04-15 at 15:21, Ram Pai wrote:
> On Tue, 15 Apr 2003, Greg Freemyer wrote:
> > All,
> > 
> ..snip...
> > 
> > Ram, possibly you could say if that is appropriate or not.  (i.e. Does 
> > EVMS know when nodes are being added to a cluster?)
> It depends on the cluster manager that EVMS interacts with. Currently EVMS
> interacts with Linux-HA cluster manager. Linux-HA cluster manager does
> not allow dynamic addition of nodes to the cluster. All the nodes that
> can possibly be part of the cluster are predefined in a configuration
> file.  So the maximum number of nodes that can be in a cluster is well 
> known. EVMS as it currently stands assumes a static cluster.
> So to answer your question, EVMS does not know when nodes are being
> added to a cluster. However EVMS comes to know when a eligible nodes
> join or leave the cluster, through the Linux-HA's membership services.
> Now the question is: does OpenGFS assume a static cluster or a dynamic 
> cluster?

It should be a goal for OpenGFS to work on both.  Even static clusters
can have updates (config files changed and committed) that change the
membership.  A dynamic cluster does that in a different way.  In both
cases, OpenGFS needs to learn about it.

This abstraction is the motivation for an Event Service like the ones
defined for OCF and (soon) SAF.

-- Joe DiMartino <joe@osdl.org>

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