[Pacemaker] How to avoid dual fencing ?

[邓尧]

How much time delay difference is enough ? I'm currently setting the delays
at 5s and 15s, dual fencing does disappear, but I'm sure whether the
difference is large enough for all situations.


On Mon, Mar 24, 2014 at 8:00 PM, Kristoffer Grönlund <kgronlund at suse.com>wrote:

> On Mon, 24 Mar 2014 19:41:16 +0800
> 邓尧 <torshie at gmail.com> wrote:
>
> > I'm configuring a 2-node cluster on CentOS 6 with corosync +
> > pacemaker + cman. Everything works well except fencing.
> >
> > I'm using IPMI as the fencing device, I know it's not the best fencing
> > device, but this is the only option I have.
> > Manual fencing a node (pcs stonith fence <node>) works well: peer
> > node goes offline, resources migrate as expected. However, if network
> > traffic between the two nodes is blocked by iptables, both nodes will
> > try to fence each other, and both would success, which result in both
> > nodes offline.
> >
> > How to avoid such problem ?
>
> You'll need to have one node take priority, by setting different
> delays on the two nodes so that one of them will fence before the
> other (see the "delay" parameter).
>
> --
> // Kristoffer Grönlund
> // kgronlund at suse.com
>
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