Unable to spawn new instance on VMware Hypervisor

Issue

• Unable to spawn new instance on VMware Hypervisor. Status of instance immediately flips to error state:

# nova list
+--------------------------------------+----------+--------+------------+-------------+----------+
| ID                                   | Name     | Status | Task State | Power State | Networks |
+--------------------------------------+----------+--------+------------+-------------+----------+
| 69af8ce8-9c03-4c70-b674-5af9c5c7548d | pbandark | ERROR  | -          | NOSTATE     |          |<==
| b3459fbb-3c38-4ff9-8500-3027fe9c9a66 | pbandark | ERROR  | -          | NOSTATE     |          |<==

• Nova reports nova-compute service as up:

# nova service-list
+----+------------------+--------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host         | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+--------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-consoleauth | abc.test.com | internal | enabled | up    | 2016-06-07T18:22:05.000000 | -               |
| 2  | nova-scheduler   | abc.test.com | internal | enabled | up    | 2016-06-07T18:22:05.000000 | -               |
| 3  | nova-conductor   | abc.test.com | internal | enabled | up    | 2016-06-07T18:22:14.000000 | -               |
| 4  | nova-cert        | abc.test.com | internal | enabled | up    | 2016-06-07T18:22:05.000000 | -               |
| 5  | nova-compute     | abc.test.com | nova     | enabled | up    | 2016-06-08T16:39:31.000000 | -               |

• nova-scheduler.log:

2016-06-03 15:04:26.718 16336 DEBUG nova.scheduler.filters.ram_filter [req-23461ce6-8616-4a92-b5bd-ff918bfd45a9 5c016306ebc34e03b0ede4578b44103c dd6da2db8bfd46bea399f31540d54c20 - - -] (xyz.test.com, domain-c43.9c877899-172f-4a58-b8e0-ba6862563ab8) ram:-512 disk:0 io_ops:0 instances:0 does not have 512 MB usable ram before overcommit, it only has 0 MB. host_passes /usr/lib/python2.7/site-packages/nova/scheduler/filters/ram_filter.py:46 <==

2016-06-03 15:04:26.718 16336 INFO nova.filters [req-23461ce6-8616-4a92-b5bd-ff918bfd45a9 5c016306ebc34e03b0ede4578b44103c dd6da2db8bfd46bea399f31540d54c20 - - -] Filter RamFilter returned 0 hosts  <===

• Even if i bypass ramfilter, instance spawn operation fails.