On Thu, 2013-03-14 at 16:26 +0100, Lars Marowsky-Bree wrote: > On 2013-03-14T09:44:11, "GGS (linux ha)" <[email protected]> wrote: > > That's fine. But the cluster software really assumes that only one > instance of it is running per server - said instance can then manage > multiple software stacks, though.
Got it. That's what I was asking. > > No. Pacemaker allows resources and groups (probably the equivalent of > your "stacks") to be individually managed. > > If you want to bring down pacemaker itself for maintenance, you'd detach > via maintenance mode, stop, update, restart, reattach. I'll have to dig in deeper, it may be a possibility. We really would like to move away from the in-house built solution. > > But there is a point where this matters, namely IO fencing/STONITH. In > case of a real server failure, you don't want 200+ independent fencing > processes to trigger. Believe it or not, I would actually rather have the 200+ fencing processes to trigger. But that is not a requirement. I just need to ensure failover completes within the allowed time. > > Yes. That's called multitasking/virtualization/cloud. We get that. ;-) Multitasking yes, virtualization no, that's another discussion :-) > > But just like you only have "one kernel" per physical server, you also > only have one cluster stack that then manages multiple stacks. We even > got ACLs so that you can grant people access to only the bits they're > allowed to manage, etc. > > What you plan - running multiple heartbeat v1 setups on one node - will > not work reliably. Running multiple pacemaker instances per node/OS > image will not work either. That's what I thought. The emails from 2009 seemed to indicate that it was possible to run multiple instances. I asked because I suspected that it really wasn't the case. Thanks for confirming it. I'll dig deeper into pacemaker and see how I can make it work for our use case. One quick question on pacemaker. If I add a new stack, do I need to bring the old ones down (or fail them) to add it to pacemaker? >From your comment above it seems that I wouldn't, but I just want to make sure. Thanks, Alberto > > > Regards, > Lars > -- Alberto Alonso Global Gate Systems LLC. (512) 351-7233 http://www.ggsys.net Monitoring the metrics that are important to you in real time _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
