[Pacemaker] pacemaker resource constraints

[Dejan Muhamedagic]

Hi,

On Mon, Mar 22, 2010 at 01:18:35PM -0700, Alan Jones wrote:
> Well, I guess my configuration is not as common.
> In my case, one of these resources, say resource A, suffers greater
> disruption if it is moved.
> So, after a failover I would prefer that resource B move, reversing the node
> placement.
> Is this possible to express?

Not sure, but don't think so.

Thanks,

Dejan

> Alan
> 
> On Mon, Mar 22, 2010 at 11:10 AM, Dejan Muhamedagic <dejanmm at fastmail.fm>wrote:
> 
> > Hi,
> >
> > On Mon, Mar 22, 2010 at 09:29:50AM -0700, Alan Jones wrote:
> > > Friends,
> > > I have what should be a simple goal.  Two resources to run on two nodes.
> > > I'd like to configure them to run on separate nodes when available, ie.
> > > active-active,
> > > and provide for them to run together on either node when one fails, ie.
> > > failover.
> > > Up until this point I have assumed that this would be a base use case for
> > > Pacemaker, however, it seems from the discussion on:
> > > http://wiki.lustre.org/index.php/Using_Pacemaker_with_Lustre
> > > ... that it is not (see below).  Any ideas?
> >
> > Why not just two location constraints (aka node preferences):
> >
> > location l1 rsc1 100: node1
> > location l2 rsc2 100: node2
> >
> > Thanks,
> >
> > Dejan
> >
> > > Alan
> > >
> > > *Note:* Use care when setting up your point system. You can use the
> > > point system if your cluster has at least three nodes or if the resource
> > > can acquire points from other constraints. However, in a system with
> > > only two nodes and no way to acquire points, the constraint in the
> > > example above will result in an inability to migrate a resource from a
> > > failed node.
> > >
> > > The example they refer to is similar to yours:
> > >
> > > # crm configure colocation colresOST1resOST2 -100: resOST1 resOST2
> >
> > > _______________________________________________
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> > > Pacemaker at oss.clusterlabs.org
> > > http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> >
> >
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> >

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