Fail to detach cinder vnx iscsi volumes

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Issue

Try to detach volume from instance: In the nova log it will report fail to detach and the cinder volume status is still shown as in-use:

2017-08-23 07:27:28.280 3509 ERROR oslo_messaging.rpc.server DeviceDetachFailed: Device detach failed for vdb: Unable to detach from guest transient domain.
2017-08-23 07:27:28.280 3509 ERROR oslo_messaging.rpc.server

Environment

Red Hat OpenStack Platform Version11.0

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