> > > > } > > > > handlers { > > > > fence-peer "/usr/lib/drbd/rhcs_fence"; > > > > } > > > > } > > > > > > > > > > > rhcs_fence is wrong fence-peer utility. You should use > > > /usr/lib/drbd/crm-fence-peer.sh and > > > /usr/lib/drbd/crm-unfence-peer.sh instead. > > > > But my understanging (probably wrong) was that the fence-peer handler is > > meant to be called for STONITH, not for "usual" promotions/demotions > > to/from Primary/Secondary. > > > > If I use the aforementioned pair of handlers (crm-*.sh) for > > fence/unfence, do I still get STONITH behavior for "split brain cases"? > > > > Correct. The 'rhcs_fence' handler passes fence calls on to cman, which > you have set to redirect on to pacemaker. This isn't what it was > designed for, and hasn't been tested. It was meant to be an updated > replacement for obliterate-peer.sh in cman+rgmanager clusters directly > (no pacemaker).
Well, since it is a CMAN cluster after all and rhcs_fence relies only (besides /proc/drbd) on cman_tool and fence_node (which should be correctly working), I thought it would be the correct fence script choice, but I will obviously accept your suggestion and use the crm-* scripts instead. Anyway, I'm afraid that the real problem lurks elsewhere, since, as I stated before, a simple master/slave promotion/demotion should not lead to fencing, I suppose. As suggested by Nikita Staroverov , I pasted relevant (I hope) excerpts from logs on first node (the one surviving the stonith) at the time of one "stonith fest" :) just after committing a CIB update with new resources. http://pastebin.com/0eQqsftb I can recall that seconds before being shot, the second node "lost contact" with cluster (I was issuing "pcs status" and "crm_mon -Arf1" from an SSH session and suddenly it went "cluster not connected" or something like that). Maybe (apart from the aforementioned improper use of rhcs_fence) there are issues with some timeout settings on cluster/DRBD operations and almost certainly the nodes have problems with their clock (still finding a reasonable/reachable NTP source), but I do not know if these can be relevant issues. Many thanks again for your suggestions. Regards, Giuseppe
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