[Pacemaker] Proposed new stonith topology syntax

[Dejan Muhamedagic]

On Mon, Jan 23, 2012 at 08:55:02AM +1100, Andrew Beekhof wrote:
> On Sat, Jan 21, 2012 at 12:18 AM, Dejan Muhamedagic <dejanmm at fastmail.fm> wrote:
> > On Fri, Jan 20, 2012 at 01:09:56PM +1100, Andrew Beekhof wrote:
> >> On Thu, Jan 19, 2012 at 12:15 AM, Dejan Muhamedagic <dejanmm at fastmail.fm> wrote:
> >> > On Wed, Jan 18, 2012 at 06:58:20PM +1100, Andrew Beekhof wrote:
> >> >> On Wed, Jan 18, 2012 at 6:00 AM, Dejan Muhamedagic <dejanmm at fastmail.fm> wrote:
> >> >> > Hello,
> >> >> >
> >> >> > On Tue, Jan 03, 2012 at 05:19:14PM +1100, Andrew Beekhof wrote:
> >> >> >> Does anyone have an opinion on the following schema and example?
> >> >> >> I'm not a huge fan of the index field, but nor am I of making it
> >> >> >> sensitive to order (like groups).
> >> >> >
> >> >> > What is wrong with order in XML elements? It seems like a very
> >> >> > clear way to express order to me.
> >> >>
> >> >> Because we end up with the same update issues as for groups.
> >> >
> >> > OK.
> >> >
> >> > [...]
> >> >
> >> >> > Is there a possibility to express
> >> >> > fencing nodes simultaneously?
> >> >>
> >> >> No.  Its regular boolean shortcut semantics.
> >> >
> >> > As digimer mentioned, it is one common use case, i.e. for hosts
> >> > with multiple power supplies. So far, we recommended lights-out
> >> > devices for such hardware configurations and if those are
> >> > monitored and more or less reliable such a setup should be fine.
> >> > It would still be good to have a way to express it if some day
> >> > somebody actually implements it. I guess that the schema can be
> >> > easily extended by adding a "simultaneous" attribute to the
> >> > "fencing-rule" element.
> >>
> >> So in the example below, you'd want the ability to not just trigger
> >> the 'disk' and 'network' devices, but the ability to trigger them at
> >> the same time?
> >
> > Right.
> 
> For any particular reason?  Or just in case?

For nodes with multiple PSU and without (supported) management
board. I think that one of our APC stonith agents can turn more
than one port off simultaneously.

Thanks,

Dejan

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