----- Original Message -----
> From: "Lars Marowsky-Bree" <l...@suse.com>
> To: "The Pacemaker cluster resource manager" <pacemaker@oss.clusterlabs.org>
> Sent: Tuesday, December 4, 2012 6:59:08 AM
> Subject: Re: [Pacemaker] Enable remote monitoring
>
> On 2012-12-04T19:48:18, "Gao,Yan" <y...@suse.com> wrote:
>
> > > Yes, I think this looks good.
> > The patch to the schema I proposed supports this already ;-)
>
> So it seems that nobody had any serious objections to this approach,
> but
> we were fiddling with details and can't actually decide what we like
> better, if anything. ;-) So why don't we proceed with the initial
> suggestion for now implement it ("restart-origin" attribute on order
> constraint), play with it for 1-2 months and fine tune it in
> practice?
>
> Andrew, David, any objections to that?
The main thing I want to avoid is an explosion of order and colocation
constraints in the configuration to support this functionality. Pushing this
off to configuration management tools like crmsh and psd may help people avoid
configuration mistakes, but when it comes to actually debugging what's going
on, having a huge constraint section in the config is a nightmare. Using
concepts like groups and sets make these relationships more obvious. I would
really like us to move forward with some sort of abstraction that allows the
relationship between the virtual machine and resources within it to be defined
as simple as possible.
I am okay with this constraint option being implemented, as it is the basis for
this whole concept. When it comes time to make this usable, don't make the
abstraction people use to configure this relationship live at the crm shell...
meaning, Don't introduce the idea of a container object in the shell which then
goes off and explodes the constraint section under the hood. Think this
through and come up with a plan to represent what is going on at the
configuration level.
-- Vossel
>
>
> Regards,
> Lars
>
> --
> Architect Storage/HA
> SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix
> Imendörffer, HRB 21284 (AG Nürnberg)
> "Experience is the name everyone gives to their mistakes." -- Oscar
> Wilde
>
>
> _______________________________________________
> Pacemaker mailing list: Pacemaker@oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started:
> http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org
>
_______________________________________________
Pacemaker mailing list: Pacemaker@oss.clusterlabs.org
http://oss.clusterlabs.org/mailman/listinfo/pacemaker
Project Home: http://www.clusterlabs.org
Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
Bugs: http://bugs.clusterlabs.org
