[ClusterLabs] Antw: Re: CRM location specification and errors

[Dejan Muhamedagic]

Hi,

On Fri, Jun 26, 2015 at 08:53:30AM +0200, Ulrich Windl wrote:
> >>> Kristoffer Grönlund <kgronlund at suse.com> schrieb am 25.06.2015 um 22:06 in
> Nachricht <87oak3ft7r.fsf at krigpad.kri.gs>:
> 
> [...]
> > Another option is to modify the resource agent and check in the monitor
> > action if this is the probe (ocf_is_probe). In that case, the monitor
> > action should return OCF_NOT_RUNNING rather than OCF_ERR_INSTALLED on
> > those nodes where the resource is not supposed to run.
> 
> Hi!
> 
> First, I think if a resource cannot be started on a node it's better to return
> OCF_ERR_INSTALLED rather than OCF_NOT_RUNNING, because it does not make any
> sense to try to start the resource on that particular node. Then, how would you

It is not always that simple. The part deemed not installed
at the probes time may reappear later. For instance, some
deployments have software on an NFS mount (I can recall that it
was the case with SAP) and that NFS mount may not be available at
the time.

So, it's safer to return OCF_NOT_RUNNING and that is what quite a
few RA do.

Thanks,

Dejan

> check in the resource agent that a resource it not to be run on the particular
> node? I mean you can do it, but aren't you duplicating cluster decision logic
> into the resource agent (where it doesn't belong to IMHO)?
> 
> Regards,
> Ulrich
> 
> 
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