[Pacemaker] Shouldn't colocation -inf: be mandatory?

[Dejan Muhamedagic]

On Tue, Jun 15, 2010 at 12:53:07PM -0400, Vadym Chepkov wrote:
> 
> On Jun 15, 2010, at 9:26 AM, Vadym Chepkov wrote:
> >>> 
> >>> what about this part? what do I need to do to prevent them from running on different nodes for sure?
> >> 
> >> You can't have it both ways.
> >> Either they have to run on the same node or they can remain active
> >> when one or more die.
> >> 
> >> Although you could do:
> >> 
> >> d1 ( d2 d3 d4 )
> >> 
> >> That would almost get what you want, unless d1 dies.
> > 
> > I guess I would have to keep the most significant as an anchor, I can
> > leave with it.
> > Unfortunately, as far as I understand, there is no way do define this
> > in shell config now, because shell adds sequential=false when it sees
> > ().

Yes it does. So, you want to have two adjacent sequential sets in
one constraint? Not very elegant, but I guess that this would do
until we figure out how to represent it:

colocation c1 inf: p1:Started p2 p3 p4

In xml:

      <rsc_colocation id="c1" score="500">
        <resource_set id="c1-0" role="Started">
          <resource_ref id="p1"/>
        </resource_set>
        <resource_set id="c1-1">
          <resource_ref id="p2"/>
          <resource_ref id="p3"/>
          <resource_ref id="p4"/>
        </resource_set>
      </rsc_colocation>

Thanks,

Dejan

> Actually, it can be done :)
> 
> dummy1 (d1 d2 d3 d4)
> dummy1 will serve as an anchor which will never fail.
> Not an elegant, but working solution, and the only one for two resources set.
> Just need support from shell to describe it properly.
> Goes to my HOWTO :)
> 
> Thanks,
> Vadym
> 
> 
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