Description of problem:

If you want to install an unusual setup via OSPd, having just 2 controller nodes, even if the process starts it fails.

Version-Release number of selected component (if applicable):

openstack-heat-templates-0-0.6.20150605git.el7ost.noarch

How reproducible:

1. Prepare the OSPd environment as usual;
2. Start the overcloud deploy by passing a control-scale of 2:

openstack overcloud deploy --templates --control-scale 2 --control-flavor vm --compute-scale 2 --compute-flavor baremetal  --ntp-server 10.16.255.1

3. Wait a little bit, then it fails;

Actual results:

The error is not specific, it's just a simple HEAT FAILED.

Expected results:

Success.

Additional info:

Investigating on the problem reveals that it's a matter of quorum. At some time the setup do this command:

/usr/sbin/pcs status | grep -q 'partition with quorum' > /dev/null 2>&1

(see openstack-puppet/modules/pacemaker/manifests/corosync.pp) and since the cluster is composed by just two nodes there is NO quorum.
This might take us to one of these choices:

1 - Prohibit a two controllers setup;
2 - Do not check the quorum on the cluster, setting also a property like no-quorum-policy to "ignore";