[Pacemaker] pacemaker resource constraints

[Alan Jones]

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?
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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>
>
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