On Sun, Jun 22, 2014 at 1:51 AM, Digimer <li...@alteeve.ca> wrote: > Excellent. > > Please note; With IPMI-only fencing, you may find that killing all power > to the node will cause fencing to fail, as the IPMI's BMC will lose power > as well (unless it has it's own battery, but most don't). > > If you find this, then the solution I would recommend is to get a pair > of switched PDUs (I like the APC brand AP7900, very fast and the > fence_apc_snmp agent is very well tested). With this, you can then setup > STONITH levels; > > http://clusterlabs.org/wiki/STONITH_Levels > > With this, if the IPMI fails, Pacemaker will move on and try fencing by > cutting power to the lost node, providing a backup method of fencing. If > you use stacked switches, put the PDUs on one switch and the IPMI interface > on the other switch, and you will provide reliable fencing in a > failed-switch state, too. > > Cheers! > > Good points. At the moment this is a lab environment so it is not crucial, but I'll take in mind for production use.
One point: after doing some tests and creating failures of nodes for test I see this behaviour about the special fencing resource normal behaviour [root@srvmgmt02 ~]# crm_mon -1 ... [snip] fence_srvmgmt01 (stonith:fence_intelmodular): Started srvmgmt01.localdomain.local fence_srvmgmt02 (stonith:fence_intelmodular): Started srvmgmt02.localdomain.local after fencing of srvmgmt01 (because of drbd problem deliberately produced by me on it) [root@srvmgmt02 ~]# crm_mon -1 ... [snip] fence_srvmgmt01 (stonith:fence_intelmodular): Started srvmgmt02.localdomain.local fence_srvmgmt02 (stonith:fence_intelmodular): Started srvmgmt02.localdomain.local and the output above remains true while srvmgmt01 is rebooting but also after it has completed startup and joins the cluster. So I presume I have to set an location constraint rule so that it can only run on its node, correct? something llike pcs constraint location fence_srvmgmt01 prefers srvmgmt01.localdomain.local=INFINITY pcs constraint location fence_srvmgmt02 prefers srvmgmt02.localdomain.local=INFINITY Gianluca
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