Hi, On Wed, May 13, 2009 at 03:50:58PM +0200, Peter Kruse wrote: > Hi Dejan, > > Dejan Muhamedagic wrote: >> Never worked with PDUs, but there should be a difference compared >> to the lights-out devices: if a PDU looses power then all nodes >> connected to it do as well. I suppose that that is much more >> likely than only one outlet failing. In that case all cluster is >> down and you have other things to worry about rather than fencing. > > we usually use two PDUs, one for each node. But even then, if > one loses power (and with it one of the nodes) the resources > will not migrate, which is the very problem here.
Why not use one PDU for both nodes? >>> This would be true if the PDU (and with it the host) loses power. >>> > At the moment it looks that stonith without such an algorithm is >>> > a SPoF by design, because after a single failure (powerloss), the >>> > cluster is not able to bring up the resources again. > >> This is something certainly worth looking at. On the other side, >> it's not really so difficult or pricey to devise a setup where >> you won't have to worry about this detail. > > really? can we talk about it? Maybe that would be a good addition > to the doc. Use a UPS. Or blades with single power infrastructure. I'd opt for one of these two. Thanks, Dejan > Regards, > > Peter > > > _______________________________________________ > Pacemaker mailing list > Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker _______________________________________________ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
