OpenStack Cinder volume is unable to attach to a VM instance

Issue

• On a new OpenStack 6 installation with 3par storage, the following error is seen in nova-compute.log:

  2015-10-19 11:22:15.902 36361 TRACE oslo.messaging.rpc.dispatcher     raise exception.VolumeBackendAPIException(data=err_msg)
  2015-10-19 11:22:15.902 36361 TRACE oslo.messaging.rpc.dispatcher VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: FibreChannelDriver validate_connector failed. No 'wwpns'. Make sure HBA state is Online.
  

• Attaching a cinder volume in OpenStack 4 doesn't work and shows the following error messages in /var/log/cinder/volume.log:

  2014-06-23 23:58:49.949 3874 WARNING nova.virt.libvirt.utils [req-4d3e8dd6-4174-4b24-aa52-4894373478fc d1cda3288e154c3e99690d29e56f4414 faa84109e5d34c61adf39ce8d8921471] systool is not installed
  

• Additional errors are seen when attaching a cinder volume to an instance:

  2014-06-23 23:59:00.394 22107 ERROR cinder.openstack.common.rpc.amqp [req-d2c5f559-6159-46eb-9b81-587832e8b02b d1cda3288e154c3e99690d29e56f4414 faa84109e5d34c61adf39ce8d8921471] Exception during message handling
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp Traceback (most recent call last):
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp   File "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py", line 441, in _process_data
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp     **args)
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp   File "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/dispatcher.py", line 148, in dispatch
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp     return getattr(proxyobj, method)(ctxt, **kwargs)
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py", line 691, in terminate_connection
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp     self.driver.terminate_connection(volume_ref, connector, force=force)
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp   File "/usr/lib/python2.6/site-packages/cinder/openstack/common/lockutils.py", line 233, in inner
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp     retval = f(*args, **kwargs)
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp   File "/usr/lib/python2.6/site-packages/cinder/volume/drivers/san/hp/hp_3par_fc.py", line 226, in terminate_connection
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp     wwn=connector['wwpns'])
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp KeyError: 'wwpns'
  2014-06-23 23:59:00.394 22107 TRACE cinder.openstack.common.rpc.amqp
  2014-06-23 23:59:00.395 22107 ERROR cinder.openstack.common.rpc.common [req-d2c5f559-6159-46eb-9b81-587832e8b02b d1cda3288e154c3e99690d29e56f4414 faa84109e5d34c61adf39ce8d8921471] Returning exception 'wwpns' to caller