On 08/18/2011 12:19 PM, Ulrich Windl wrote: > Hi! > > Reading the docs, I learned that pacemaker understands more complex > dependencies than "group" where resources are strictly sequential. For > example one could start a set of resources in parallel, then wait until all > are done, then start another set of resources, etc. > > Now I wonder: > 1) Can such a thing (i.e. parallelism) be configured with crm shell? If so, > what is the syntax like?
If you have two resources like primitives and they do not have any order constraints (neither explizit by a order constraint nor implizit by membership in group) such resources are assumed be "startable"/"stopable" in parallel and the cluster will do not have any peferences about the order. > > 2) In some resource groups, not all resources are really required. For > example in a RAID1, only one of both legs is really required to start up the > RAID (assuming I need to activate some extra resource for each leg of the > RAID). Can such a dependency be expressed in CRM? If so, how do you do it? Beside the fact that I do not see the both legs/ 2 x single leg ressources for RAID1 I would say yes that possible but will increase the complexity of the cluster and the most important idea behind clustering is: "keep it simple". In your case the critical point could be the "OR" in the oredring of costraints. All resouces after your 2 legs solution could be started, if Leg1 OR Leg2 is up. Maybe that has to be described via ordering constraints. > > I'd wish (I know what you will reply ;-)) that could be expressed with the > crm shell. really? - why I wrote my answer, if you already knew it ;-) > > Regards, > Ulrich > > > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
