[ClusterLabs] Q: ordering for a monitoring op only?

[Kristoffer Grönlund]

On Mon, 2018-08-20 at 10:51 +0200,  Ulrich Windl  wrote:
> Hi!
> 
> I wonder whether it's possible to run a monitoring op only if some
> specific resource is up.
> Background: We have some resource that runs fine without NFS, but the
> start, stop and monitor operations will just hang if NFS is down. In
> effect the monitor operation will time out, the cluster will try to
> recover, calling the stop operation, which in turn will time out,
> making things worse (i.e.: causing a node fence).
> 
> So my idea was to pause the monitoing operation while NFS is down
> (NFS itself is controlled by the cluster and should recover "rather
> soon" TM).
> 
> Is that possible?

It would be a lot better to fix the problem in the RA which causes it
to fail when NFS is down, I would think?

> And before you ask: No, I have not written that RA that has the
> problem; a multi-million-dollar company wrote it (Years before I had
> written a monitor for HP-UX' cluster that did not have this problem,
> even though the configuration files were read from NFS (It's not
> magic: Just periodically copy them to shared memory, and read the
> config from shared memory).
> 
> Regards,
> Ulrich
> 
> 
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-- 

Cheers,
Kristoffer