On 2012-12-03T16:32:14, David Vossel <dvos...@redhat.com> wrote:
> > + <optional>
> > + <attribute name="restart-origin"><data type="boolean"/></attribute>
> > + </optional>
>
> I don't feel strongly about this. Here's what comes to mind for me.
>
> force-recover - force recovery of both sides of the constraint if either side
> fails
We actually have a precedent here - grep for restart_type. ;-)
"force-recover" doesn't quite fit for me; because for the first->then
distinction, we already have the 0 versus inf score differentiation.
What would force-recover do for score=0?
(Ohhh. Did we just find a use for a negative score here? ;-) Just
throwing that out there. It'd fit the model we have so far, is all I'm
saying.)
But - I think restarting alone doesn't suffice. Do we want to have the
restarts count towards the migration-threshold of the parent resource
too? I think we may want that.
If we want to stick with the terminology, "restart-first" (but -origin
sounds better, so I don't feel that strongly either) as a tri-state (no
(default), yes, treat-as-failure (anyone got a snappy idea for that
one?) might make be advisable.
> Here's a thought. Add the new constraint flag as well as a new option on the
> primitive that escalates failures to the parent resource (pretty sure this
> idea isn't mine, maybe Andrew threw it at me a few weeks ago)
>
> Then you could do something like this.
>
> primitive vm
> group vm-resources
> primitive nagios-monitor-foo
> primitive nagios-monitor-bar
>
> order vm then vm-resources reset-origin
> colocation vm vm-resources.
>
>
> It isn't as simple (configuration wise, not implementation wise) as the
> container concept, but at least this way you don't have to build
> relationships between the vm and every resource in it explicitly. It seems
> like leveraging groups here would be a good idea.
One the one hand, this makes a lot of sense.
But when we're going this far, why not directly:
group vm-with-resources vm nagios-monitor-foo nagios-monitor-bar \
meta restart-origin="true"
? All we'd be doing is flip the restart-origin bit on the orders
implicit in the group.
Regards,
Lars
--
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB
21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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