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Hello,
I am not able to attach a volume to a running instance.

I am able to create volume but attaching it to the running instance is failing. Using Essex release.
I am getting the following error:
 
File /etc/iscsi/initiatorname.iscsi could not be found.
 
Detailed nova-compute log:
 
2012-05-17 13:50:28 ERROR nova.rpc.amqp [req-301e50a2-3238-4924-b7f0-477be7e0ffa8 75899f2562cc44d9aa0f120ff1d246be 6672d2141fe4454e87fad2ba19223327] Exception during message handling
2012-05-17 13:50:28 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/rpc/amqp.py", line 252, in _process_data
2012-05-17 13:50:28 TRACE nova.rpc.amqp     rval = node_func(context=ctxt, **node_args)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/exception.py", line 114, in wrapped
2012-05-17 13:50:28 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 153, in decorated_function
2012-05-17 13:50:28 TRACE nova.rpc.amqp     function(self, context, instance_uuid, *args, **kwargs)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 177, in decorated_function
2012-05-17 13:50:28 TRACE nova.rpc.amqp     sys.exc_info())
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-17 13:50:28 TRACE nova.rpc.amqp     self.gen.next()
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 171, in decorated_function
2012-05-17 13:50:28 TRACE nova.rpc.amqp     return function(self, context, instance_uuid, *args, **kwargs)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 1717, in attach_volume
2012-05-17 13:50:28 TRACE nova.rpc.amqp     self.volume_api.unreserve_volume(context, volume)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-17 13:50:28 TRACE nova.rpc.amqp     self.gen.next()
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 1708, in attach_volume
2012-05-17 13:50:28 TRACE nova.rpc.amqp     connector = self.driver.get_volume_connector(instance_ref)
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/connection.py", line 479, in get_volume_connector
2012-05-17 13:50:28 TRACE nova.rpc.amqp     self._initiator = libvirt_utils.get_iscsi_initiator()
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/utils.py", line 42, in get_iscsi_initiator
2012-05-17 13:50:28 TRACE nova.rpc.amqp     contents = utils.read_file_as_root('/etc/iscsi/initiatorname.iscsi')
2012-05-17 13:50:28 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/utils.py", line 1635, in read_file_as_root
2012-05-17 13:50:28 TRACE nova.rpc.amqp     raise exception.FileNotFound(file_path=file_path)
2012-05-17 13:50:28 TRACE nova.rpc.amqp FileNotFound: File /etc/iscsi/initiatorname.iscsi could not be found.
2012-05-17 13:50:28 TRACE nova.rpc.amqp

I appreciate any help.
Thanks,
-vj