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Re: [Clusters_sig] RE: [Linux-cluster] Re: [Ocfs2-devel] [RFC] nodemanager, ocfs2, dlm

On 2005-07-20T09:55:31, "Walker, Bruce J (HP-Labs)" <bruce walker hp com> wrote:

> Like Lars, I too was under the wrong impression about this configfs
> "nodemanager" kernel component.  Our discussions in the cluster
> meeting Monday and Tuesday were assuming it was a general service that
> other kernel components could/would utilize and possibly also
> something that could send uevents to non-kernel components wanting a
> std. way to see membership information/events.

Let me clarify that this was something we briefly touched on in
Walldorf: The node manager would (re-)export the current data via sysfs
(which would result in uevents being sent, too), and not something we
dreamed up just Monday ;-)

> As to kernel components without corresponding user-level "managers",
> look no farther than OpenSSI.  Our hope was that we could adapt to a
> user-land membership service and this interface thru configfs would
> drive all our kernel subsystems.

Well, node manager still can provide you the input as to which nodes are
configured, which in a way translates to "membership". The thing it
doesn't seem to provide yet is the supsend/modify/resume cycle which for
example the RHAT DLM seems to require.

    Lars Marowsky-Brée <lmb suse de>

High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business	 -- Charles Darwin
"Ignorance more frequently begets confidence than does knowledge"

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