I am working with openstack cinder integration with vmware vcenter. Now I am able to create volumes successfully. But When I tried attaching the created volume to the running Vmware instance via openstack horizon, it failed with error message in vsphere client's recent task stating " The attempted operation can not be performed in power ON state" . So I tried with shut off instance in which volume get attached successfully.
Is it possible to attach instance while instance in running state ?