On Mon, Jul 01, 2013 at 11:53:29AM -0400, Digimer wrote: > On 07/01/2013 04:52 AM, Dejan Muhamedagic wrote: > > Right. It is often missed that actually more than one failure is > > required for that setup to fail. In case of dual PDU/PSU/UPS an > > IPMI based fencing is sufficient. > > You are right, of course. Imagine though that the IPMI BMC's network > port or cable could have silently failed some time before the node > failed. Yes, this is two simultaneous failues so not an overall SPoF, > but likely enough that it should be addressed. > > If you've already setup redundant power, then it strikes me as fairly > easy to use your PDUs as a backup fence method. > > Now all this said, you'll note in the mailing lists and IRC that I don't > tell people they should have two methods. If people setup just IPMI > fencing, I am happy. It's a question of how careful do you want/need to > be, after that. For me, one fence method is not enough.
I suppose that you're supporting a few clusters. How often does it happen that nodes get fenced? And why? And did you in those cases needed to use the backup fence device? Thanks, Dejan > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without > access to education? > > _______________________________________________ > 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://bugs.clusterlabs.org _______________________________________________ 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://bugs.clusterlabs.org
