[Linux-HA] Resources failing to start takes down all HB resources

[Ragnar Kjørstad]

On Thu, Mar 22, 2007 at 10:34:38AM -0600, Serge Dubrouski wrote:
> >So, yes, using explisit rules instead of groups can be useful when the
> >rules are a bit more complex, but it doesn't change the fundamental
> >issue of A and B beeing stopped because C can not run.
> 
> Use other rules. Not collocation.

Interesting. Do you have an example that would accomplish this?

Does it mean that colocation rules implicitly mean that "A can not run
anywhere where B does not run" and "B can not run anywhere where A does
not run", and that one without the other is only allowed during
startup/shutdown?

That would match what we've experienced. 

However, I don't think it makes sense for what users typically use
colocation for. E.g. if I say that my webserver must run on the same
machine as the database, why should that imply that the databaseserver
should not be allowed to run if the webserver can't?



-- 
Ragnar Kjørstad
Software Engineer
Scali - http://www.scali.com
Scaling the Linux Datacenter