[dm-devel] multipath state between user and kernel space

[Christophe Varoqui]

On Thu, Jul 07, 2005 at 07:08:13PM -0400, goggin, edward wrote:
> On Sat, 02 Jul 2005 00:07:40 +0200
> christophe varoqui <christophe.varoqui at free.fr> wrote
> 
> > Would printing the "PG-summed path priorities" value for each PG meet
> > your needs/taste ?
> 
> Yes.  I assume that this would be the sum as recorded by multipathd and
> the kernel's active path group would only reflect this under certain
> conditions, (e.g., immediate failback is enabled).
> 
> What about the idea of having device specific display options (and
> device specific plug-ins to manage these) which while they are
> multipathing relevant, they are not managed by multipath(8)?
> Are you trying to stay away from this?
> 
> I'm sure our CLARiiON customers would rather see that the multipath
> display command using terminology which they are familiar with
> already.
> 
I'd rather favor consistency for users changing multipathing hardware, than for users changing OS but keeping the same multipathing hardware.

I guess in the second case, the users already expects changes.

Also I suspect multi-vendor SAN users will appreciate the consistency.

Do you have strong feelings about this plugin idea ?

Regards,
cvaroqui