Hi, On Tue, Nov 22, 2011 at 08:17:28AM +0100, [email protected] wrote: > Hi > > By the way, is there a description somewhere of parameters from > /etc/sysconfig/pacemaker ?
To the best of my knowledge, there is only LRMD_MAX_CHILDREN. Thanks, Dejan > Thanks > Alain > > > > De : Dejan Muhamedagic <[email protected]> > A : General Linux-HA mailing list <[email protected]> > Date : 21/11/2011 15:48 > Objet : Re: [Linux-HA] Antw: What about "start-delay" attribute status ? > Envoyé par : [email protected] > > > > On Mon, Nov 21, 2011 at 03:07:43PM +0100, [email protected] wrote: > > Thanks Dejan, > > ok I understand, so we have to choose between a small value of > > LRMD_MAX_CHILDREN > > and on start, stop, or status of 64 resources it will take a while ... > > and a big value of LRMD_MAX_CHILDREN and then either the start, stop and > > at best, status will be achieved very quickly as they are parallelized > or > > at > > worst the system will be "on knees" ... > > We'll give it a try ... as I have big computers ;-) > > Just note that you should try to think of every possible > combination of resource operations. For instance, imagine 64 Xen > VMs trying to start in parallel. Better be conservative than > to push your nodes to their limit. > > > But my question is now : when you write : > > "Let me just add that operations which were supposed to > > start at the same time get spaced out." > > So if LRMD_MAX_CHILDREN=4, that means that if ask for start on 32 > > resources at the > > same time, Pacemaker will mange 4, delay the remaing 28, manage 4 again, > > > etc. so > > it will be completed in 8 shots, right ? > > No. > > > But what is the delay value between each shot ? > > There is none. As soon as one operation finishes, another one > gets started. Now, if you have say four big RDBMS instances > starting and each of them takes five minutes or so, the other > resources will obviously stay in the queue for five minutes. > > Anyway, you can see for yourself on cluster start, just grep > your logs for lrmd:.*rsc:, it should show you all timestamps > when certain operation was started (apart from recurring > monitors). > > Thanks, > > Dejan > > > Thanks > > Alain > > > > > > > > > > De : Dejan Muhamedagic <[email protected]> > > A : General Linux-HA mailing list <[email protected]> > > Date : 21/11/2011 13:45 > > Objet : Re: [Linux-HA] Antw: What about "start-delay" attribute status > ? > > Envoyé par : [email protected] > > > > > > > > Hi, > > > > On Mon, Nov 21, 2011 at 01:42:15PM +0100, [email protected] wrote: > > > Hi Florian, > > > ok I've checked the thread, so that means that on RHEL6 , if I have > > let's > > > say 32 resources groups of 2 primitives on > > > each node, I can set the LRMD_MAX_CHILDREN environment variable in > > > /etc/sysconfig/pacemaker to 64 ? > > > > The number of resources shouldn't be the main criteria for > > setting this parameter, but what can your nodes handle without > > being overloaded. So, 64 sounds sounds like you have some really > > big computers :) It also depends on the nature of the cluster > > resources. The default of 4 is rather conservative, perhaps > > nowadays 8 would be better. > > > > > Is it acceptable for lrmd and Pacemaker ? Or will we face any > > side-effect > > > ? > > > > LRMD_MAX_CHILDREN is the maximum number of resource operations > > allowed to run in parallel. Hope that that answers your question. > > > > Thanks, > > > > Dejan > > > > > Thanks > > > Alain > > > > > > > > > > > > De : Florian Haas <[email protected]> > > > A : General Linux-HA mailing list <[email protected]> > > > Date : 21/11/2011 12:58 > > > Objet : Re: [Linux-HA] Antw: What about "start-delay" attribute > status > > ? > > > Envoyé par : [email protected] > > > > > > > > > > > > On 11/21/11 13:03, [email protected] wrote: > > > > Hi, > > > > yes that's exactly the purpose of my question (and exactly the same > > > > problem of "big-monitoring-trains") : > > > > if we can always use start-delay to ramdomize the first monitor > > > operation > > > > time on all the resources on a server, > > > > but if it is really deprecated, that means that in the future this > > > option > > > > will no more > > > > be managed by Pacemaker (perhaps it already is the case ... ?) , so > in > > > > > > this case > > > > we must not use this option. > > > > > > > > Could someone give us a clear status on this option "start-delay" ? > > > > > > If your RA needs it, then the RA is most likely broken. :) > > > > > > For monitor operations allegedly piling up, please consider this: > > > http://www.gossamer-threads.com/lists/linuxha/pacemaker/76152#76152 > > > > > > Hope this helps. > > > Cheers, > > > Florian > > > > > > -- > > > Need help with High Availability? > > > http://www.hastexo.com/now > > > _______________________________________________ > > > Linux-HA mailing list > > > [email protected] > > > http://lists.linux-ha.org/mailman/listinfo/linux-ha > > > See also: http://linux-ha.org/ReportingProblems > > > > > > _______________________________________________ > > > Linux-HA mailing list > > > [email protected] > > > http://lists.linux-ha.org/mailman/listinfo/linux-ha > > > See also: http://linux-ha.org/ReportingProblems > > _______________________________________________ > > Linux-HA mailing list > > [email protected] > > http://lists.linux-ha.org/mailman/listinfo/linux-ha > > See also: http://linux-ha.org/ReportingProblems > > > > _______________________________________________ > > Linux-HA mailing list > > [email protected] > > http://lists.linux-ha.org/mailman/listinfo/linux-ha > > See also: http://linux-ha.org/ReportingProblems > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems > > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
