[Linux-ha-dev] lha-md model.

[Kashif Shaikh]

>From the lha-md.txt:

>Internals
>---------
>
>The lha-md system is comprised by two main elements:
>
>   o lha-md resource
>   o lha-md program
>
>The lha-md resource is an OCF resource which activates or deactivates the
>daemon on the cluster following the cluster behavior (specifically,
>following the Designated Coordinator behaviour).
>
>The lha-md daemon is a TCP server which attends to the requests made by the
>clients. It is activated or deactivated by the lha-md resource.
>
>To be sure that the lha-md will be always available for the clients, it
will
>linked to an IPaddr resource which will be activated or deactivated by the
>CRM.
>
>This way, clients can always connect to the cluster management daemon
>and manage the cluster from anywhere.

Hmmm...there shouldn't be a requirement that lha-md should always be
available from an IPaddr resource. I mean the end-user should be given an
option of creating an IPaddr resource to manage the lha-md resource.

Another thing: is a single-daemon good enough? Maybe running an lha-md
daemon on each node is better, where they communicate vi HBcomm API. For
instance some admin operations can be done on one node(i.e. adding a node
where the underlying CIB handles the cluster-wide distribution and
notification of the node) but some operations must be cluster-wide where
they is no underlying layer to handle such operations. A simple command such
as "shutdown cluster" will need to run 'shutdown -t now' on each member.

So unless management operations are delegated to a cluster-wide daemon(i.e
CRM), I think it will be better to design lha-md as a multi-node resource(if
that is possible).

Kashif


> -----Original Message-----
> From: linux-ha-dev-bounces at lists.linux-ha.org
> [mailto:linux-ha-dev-bounces at lists.linux-ha.org]On Behalf Of Rodrigo
> Henriquez M. - Corporacion Linux S.A.
> Sent: Tuesday, February 15, 2005 12:12 PM
> To: High-Availability Linux Development List
> Subject: [Linux-ha-dev] lha-md model.
>
>
>
> Hi again.
>
> Here is the lha-md model with the modifications suggested for some of you.
>
> Feel free to do all your suggestions or critiques.
>
> Regards.
>
> 	-- Ro
>
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