[Pacemaker] group resource starting parallel

[Dejan Muhamedagic]

On Mon, Jun 10, 2013 at 06:14:27PM +0200, Dejan Muhamedagic wrote:
> On Mon, Jun 10, 2013 at 03:28:56PM +0000, Wolfgang Routschka wrote:
> > Hi,
> > 
> > thanks for your answer.
> > 
> > Hi,
> > 
> > On Thu, Jun 06, 2013 at 09:01:33AM +0200, Florian Crouzat wrote:
> > > Le 05/06/2013 16:23, Wolfgang Routschka a ?crit :
> > > >Hi Guys,
> > > >
> > > >one question about group  resource for starting parallel configuring 
> > > >with crmshell (Scientific Linux 64 with pacemaker 1.1.8-7, cman-3.0.12.1-49 and crmsh-1.2.5-55).
> > > >
> > > >in my 2 node cluster I?ll configured a group with 40 ip-address 
> > > >resources for easy managing. Now I want that start the resources parallel.
> > > >
> > > >in my crmshell I cannot use the option "meta ordered=false"  - these 
> > > >option is no longer disponse for my information
> > > >
> > > >Afte searching i found "resource sets" so I hope it?s correct for my 
> > > >way  to parallel my resources but I can?t configure resource sets in crmshell in my opinion.
> > > >
> > > >How can I configure my resources to start parallel?
> > > >
> > > >Greetings Wolfgang
> > > 
> > > Well, as one the primary author of pacemaker once said[1] "Unordered 
> > > and/or uncolocated groups are an abomination."
> > > 
> > > I don't know if his position has moved but a group beeing a syntaxic 
> > > shortcut for ordering+collocation, trying to make it behave otherwise 
> > > might not be a good idea, even if I understand your need to address a 
> > > group of 40 resources in a command.
> > > 
> > > Question: the couple seconds (if not a single second) required to 
> > > start synchronously 40 IPaddr2 RA are too long to wait for you ? Why 
> > > do you /must/ start them in parallel ?
> > 
> > I can only start my Web-Application after running all ip-resources so the first ip-resource is offline in the meantime.
> > 
> > 
> > >That's what a resource set is for. Just define a collocation with those 40 IP address resources.
> > >Thanks,
> > >
> > >Dejan
> > 
> > I don´t know how can I configure resource sets in crmshell exactly. For my information a resource set is called if 2 or more resources are in relationship in a colocation - is it right?
> 
> Yes.
> 
> > crm configure colocation c_parallel inf: (resource1, resource2, resource3, resource4....)
> 
> You should drop commas:
> 
> crm configure colocation c_parallel inf: (resource1 resource2 resource3 resource4....)
> 
> But anyway, I think that you want to remove the parenthesis:
> 
> crm configure colocation c_parallel inf: resource1 resource2 resource3 resource4....
> 
> That should keep the resources together, but still allow that
> they start in parallel.

If you want to keep resources running independently of each
other, then I think you should use a score different from "inf".
Probably something greater than resource-stickiness, if you have
that defined too.

Thanks,

Dejan

> Thanks,
> 
> Dejan
> 
> > But in my crm_mon resources all resources successively start
> > 
> > Greetings
> > 
> > Wolfgang