In a cluster of computing nodes having shared access to one or more volumes of data storage using a parallel file system, a method for managing the data storage includes selecting a first one of the nodes to serve as a session manager node, and selecting a second one of the nodes to serve as a session node for a data management application. Piezoelectric devices and structures are disclosed that may be employed in combination with electro-magnetic or capacitive elements to enhance the power harvesting capabilities of the piezoelectric devices. In a preferred embodiment, the control and status message protocol supports messages that can be a message payload of a host interface protocol payload. The method comprises acquiring volumetric image data for an anatomical region of interest, acquiring position data for a catheter inserted in the region of interest, obtaining electrophysiological measurements for the region of interest and combining the image data, position data and EP measurements into a resultant image for use in the interventional procedure.