In some situations it may be possible for the lun on an eseries controller to be mapped, but for cinder to not know about it. In this situation, if you then attempt certain operations in cinder (such as upload-to-image or create volume from image), cinder will attempt to attach the lun to the cinder node. This will fail because the eseries controller returns back an error that the lun is already mapped.
2014-04-18 12:30:04.424 DEBUG cinder.volume.drivers.netapp.eseries.client [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Invoking rest with method: POST, path: /storage-syste
ms/{system-id}/volume-mappings, data: {'mappableObjectId': u'0200000060080E500023BB340000C7C65350FAAF', 'targetId': u'8400000060080E500023C734003024D55350F8AA', 'lun': 1}, use_system: True, timeout: None, verify: False, kwargs: {}. from
(pid=30195) _invoke /opt/stack/cinder/cinder/volume/drivers/netapp/eseries/client.py:123
2014-04-18 12:30:04.426 DEBUG urllib3.connectionpool [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Setting read timeout to None from (pid=30195) _make_request /usr/lib/pytho
n2.7/dist-packages/urllib3/connectionpool.py:375
2014-04-18 12:30:04.809 DEBUG urllib3.connectionpool [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] "POST /devmgr/v2/storage-systems/f79b215b-b502-43b7-800c-9b6a08c7086b/volu
me-mappings HTTP/1.1" 422 None from (pid=30195) _make_request /usr/lib/python2.7/dist-packages/urllib3/connectionpool.py:415
2014-04-18 12:30:04.812 ERROR cinder.volume.driver [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Unable to fetch connection information from backend: Response error - {
"errorMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"localizedMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"retcode" : "105",
"codeType" : "symbol"
}.
2014-04-18 12:30:04.812 DEBUG cinder.volume.driver [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Cleaning up failed connect initialization. from (pid=30195) _attach_volume /
opt/stack/cinder/cinder/volume/driver.py:399
2014-04-18 12:30:04.862 ERROR oslo.messaging.rpc.dispatcher [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Exception during message handling: Bad or unexpected response from
the storage volume backend API: Unable to fetch connection information from backend: Response error - {
"errorMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"localizedMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"retcode" : "105",
"codeType" : "symbol"
}.
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher incoming.message))
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher return self._do_dispatch(endpoint, method, ctxt, args)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher result = getattr(endpoint, method)(ctxt, **new_args)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/volume/manager.py", line 719, in copy_volume_to_image
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher payload['message'] = unicode(error)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/openstack/common/excutils.py", line 68, in __exit__
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/volume/manager.py", line 713, in copy_volume_to_image
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher image_meta)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/volume/driver.py", line 355, in copy_volume_to_image
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher attach_info = self._attach_volume(context, volume, properties)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/cinder/cinder/volume/driver.py", line 406, in _attach_volume
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher raise exception.VolumeBackendAPIException(data=err_msg)
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: Response error - {
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher "errorMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher "localizedMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher "retcode" : "105",
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher "codeType" : "symbol"
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher }.
2014-04-18 12:30:04.862 TRACE oslo.messaging.rpc.dispatcher
2014-04-18 12:30:04.865 ERROR oslo.messaging._drivers.common [req-fca76af9-20d8-407a-9641-416409264944 020beefaca554b97b895fb11fd176177 d1155ac0ccaf4f879b8817151d6a3ee8] Returning exception Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: Response error - {
"errorMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"localizedMessage" : "The operation cannot complete because the volume you are trying to map is already accessible by a host group or host in this partition.",
"retcode" : "105",
"codeType" : "symbol"
}. to caller
Though there are proper ways to handle detaching/