Mostly yes. Many, many people use just stonith and it's enough for
recovery in most failure cases.
However, personally, I always use (and recommend) PDU fencing as a
backup fence method. The reason is that IPMI shares it's power with the
same power that feeds the node itself. So if the node totally loses
power[1], most systems will lose their IPMI as well. This will mean that
the surviving node will fail to fence the peer. The survivor can not
safely assume the state of the peer, so the only safe option is to block.
By having backup PDU fencing, pacemaker can use STONITH levels[2] to say
"try fencing using IPMI, but if that fails, go and try fencing by PDUs".
Generally, you will want two PDUs and nodes with redundant power
supplies. If you have a single PDU, and that PDU fails (or the
UPS/circuit behind it fails), you're going to lose both fence methods.
By using dual PDUs (and dual UPSes/mains circuits), the failure of one
power rail will leave IPMI working.
This may seem complicated, but it's pretty straight forward and it is
what we've used for years successfully (albeit on RHCS, though I've
tested it successfully with pacemaker 1.1.10+).
digimer
1. https://alteeve.ca/w/AN!Cluster_Tutorial_2#Cutting_the_Power_to_an-c05n01
2. http://clusterlabs.org/wiki/STONITH_Levels
On 05/06/14 11:42 PM, kamal kishi wrote:
Thank U digimer, will try your solution.
But is IPMI Stonith enough for my configuration??
On Thu, Jun 5, 2014 at 10:56 PM, Digimer <li...@alteeve.ca
<mailto:li...@alteeve.ca>> wrote:
On 05/06/14 08:09 AM, kamal kishi wrote:
property no-quorum-policy=ignore
property stonith-enabled=false
This is not good. You *must* have tested, working stonith in
pacemaker. You already set the fence handler and fencing policy in
drbd, but it only works if pacemaker's stonith is configured and
working.
Correct this and see if your problem remains.
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