Devin, In production I am planning to have 2 separate AP7900 units each plugged into 2 different APC UPS units to achieve that. I would then have the single node name on each, for each of the 2 PS's on the individual systems. I'm currently testing at our other site that does not have multiple UPS units, and the splitter was the solution. I am concerned about 2 node names on the outlets on the same AP7900, as it failed to work on all the names a couple of times. It would get at least 1 (the latter of the 2), put not always both. This failure was rare, but did happen. The solution was to always have just 1 outlet with the node name on the AP7900. I have never seen that fail. Also, as suggested, I did reduce the interval of the monitor time from 30s to 2h on the AP7900. Perhaps that was a factor.
Thanks, Rick -----Original Message----- From: Devin Reade [mailto:g...@gno.org] Sent: Sunday, November 14, 2010 9:32 PM To: pacemaker@oss.clusterlabs.org Subject: Re: [Pacemaker] Stonith Device APC AP7900 Rick Cone <rc...@securepaymentsystems.com> wrote: > Perhaps I'll just use 1 outlet with the node name, > with a power splitter to the 2 redundant power supplies to reduce the > chances of problems. IMO, if you're going to use a chassis with redundant power supplies, you're better off with a system that uses an ALOM/DRAC/iLO, or equivalent that sits between the redundant power bus and the main boards, and then plug your redundant power supplies into two different circuits. Otherwise, for what's supposed to be an HA system, you're introducing unnecessary single points of failure. I know the arguments about using an external device for fencing, but in the redundant power case if you can't reach your ALOM/whatever you're already looking at the multiple failures. But it's your datacenter. FWIW, I can confirm that the AP7900 works just fine and should be added to the list of supported devices. Devin _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
