Hi, On Wed, Nov 17, 2010 at 05:01:20PM -0600, Andrew Daugherity wrote: > > Message: 3 > > Date: Tue, 16 Nov 2010 11:24:26 +0100 > > From: Dejan Muhamedagic <deja...@fastmail.fm> > > To: The Pacemaker cluster resource manager > > <pacemaker@oss.clusterlabs.org> > > Subject: Re: [Pacemaker] Stonith Device APC AP7900 > > Message-ID: <20101116102426.ga22...@rondo.homenet> > > Content-Type: text/plain; charset=us-ascii > > > > Hi, > > > > On Mon, Nov 15, 2010 at 10:41:22AM -0700, Devin Reade wrote: > > > --On Monday, November 15, 2010 08:40:45 AM -0700 Rick Cone > > > <rc...@securepaymentsystems.com> wrote: > > > > > > > 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. > > ... > > > > Right, there's currently no way to do a simultaneous reset on two > > distinct fencing devices. > > > > > I think that in such a case you'd also have to ensure that your stonith > > > action is poweroff rather than reset, or your node may not actually > > > lose power (although you could mitigate that likelihood by configuring > > > a longer reset time in the PDU). > > > > Defining more than one stonith resource wouldn't work in this > > case either, because as soon as one of them reports success, the > > node is considered fenced. > > There is one possible solution to this -- the APC switched PDUs do > support being configured in multicast groups, and you can configure > groups of outlets together, even spanning several PDUs. For example you > could say PDU 1, outlet 1 and PDU 2, outlet 3 are known as "webserver1", > and then tell it to "power cycle webserver1". If it's not already > supported by the stonith agent it shouldn't be too hard to add it -- > APC's syntax is actually documented fairly well.
There's a mention of that in README.rackpdu. I was even castigated for adding it :) For, apparently, the feature can fail without giving the caller any error indication. At least that's what somebody reported. Thanks, Dejan > The obvious disclaimer is that I haven't tried this myself. I do have a > similar setup, but decided it was easier to use the IPMI stonith agent > (external/ipmi) to control my servers. > > -- > Andrew Daugherity <adaugher...@tamu.edu> > Texas A&M University > > > _______________________________________________ > 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
