[Pacemaker] How to start resources in a Resource Group in parallel

[Lars Ellenberg]

On Thu, Feb 02, 2012 at 08:28:16PM +1100, Andrew Beekhof wrote:
> On Tue, Jan 31, 2012 at 9:52 PM, Dejan Muhamedagic <dejanmm at fastmail.fm> wrote:
> > Hi,
> >
> > On Tue, Jan 31, 2012 at 10:29:14AM +0000, Kashif Jawed Siddiqui wrote:
> >> Hi Andrew,
> >>
> >>           It is the LRMD_MAX_CHILDREN limit which by default is 4.
> >>
> >>           I see in forums that this parameter is tunable by adding /etc/sysconfig/pacemaker
> >> with the following line as content
> >>    LRMD_MAX_CHILDREN=8
> >>
> >>           But the above works only for Hearbeat. How do we do it for Corosync?
> >>
> >>           can you suggest?
> >
> > It is not heartbeat or corosync specific, but depends on support
> > in the init script (/etc/init.d/corosync). The init script should
> > read the sysconfig file and then invoke lrmadmin to set the max
> > children parameter.
> 
> Just a reminder, but systemd unit files cannot do this.
> SLES wont be affected for a while, but openSUSE users will presumably
> start complaining soon.
> 
> I recommend:
> 
> diff -r 0285b706fcde lrm/lrmd/lrmd.c
> --- a/lrm/lrmd/lrmd.c	Tue Sep 28 19:10:38 2010 +0200
> +++ b/lrm/lrmd/lrmd.c	Thu Feb 02 20:27:33 2012 +1100
> @@ -832,6 +832,13 @@ main(int argc, char ** argv)
>  		init_stop(PID_FILE);
>  	}
> 
> +        if(getenv("LRMD_MAX_CHILDREN")) {
> +            int tmp = atoi(getenv("LRMD_MAX_CHILDREN"));
> +            if(tmp > 4) {
> +                max_child_count = tmp;
> +            }
> +        }
> +
>  	return init_start();
>  }

Yes, please...

and of course we have to remember to not only set, but also export
LRMD_MAX_CHILDREN from wherever lrmd will be started from.

	Lars