[Pacemaker] Fencing order

Andrew Beekhof andrew at beekhof.net
Fri Mar 25 05:58:51 EDT 2011

On Mon, Mar 21, 2011 at 4:06 PM, Pavel Levshin <pavel at levshin.spb.ru> wrote:
> Hi.
> Today, we had a network outage. Quite a few problems suddenly arised in out
> setup, including crashed corosync, known notify bug in DRBD RA and some
> problem with VirtualDomain RA timeout on stop.
> But particularly strange was fencing behaviour.
> Initially, one node (wapgw1-1) has parted from the cluster. When connection
> was restored, corosync has died on that node. It was considered "offline
> unclean" and was scheduled to be fenced. Fencing by HP iLO did not work
> (currently, I do not know why). Second priority fencing method is meatware,
> and it did take time.
> Second node, wapgw1-2, hit DRBD notify bug and failed to stop some
> resources. It was "online unclean". It also was scheduled to be fenced. HP
> iLO was available for this node, but it had not been STONITHed until I
> manually confirmed STONITH for wapgw1-1.
> When I confirmed first node restart, second node was fenced automatically.
> Is this ordering intended behaviour or a bug?

A little of both.

The ordering (in the PE) was added because stonithd wasn't able to
cope with parallel fencing operations.
I don't know if this is still the case for stonithd in 1.0.  Perhaps
Dejan can comment.

Unfortunately, as you saw, this means that we fence nodes one by one -
and that if op N fails, we never try op > N.

Ideally the ordering would be removed, lets see what Dejan has to say.

> It's pacemaker 1.0.10, corosync 1.2.7. Three-node cluster.
> --
> Pavel Levshin
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