A pacing system for providing optimal hemodynamic cardiac function for parameters such as ventricular synchorny or contractility, or stroke volume using system for calculating atrio-ventricular delays for optimal timing of a ventricular pacing pulse. The system includes one or more sensors in the crankcase ventilation system. Each barb has a base connected with the flexible filament, a blunt tip spaced from the base, a leading edge extending between the base and the blunt tip and facing toward the first end of the flexible filament, and a trailing edge extending between the base and the tip and facing toward the second end of the flexible filament. The improvement in elastic modulus is typically greater than about 100%, and more typically greater than about 200%. At last, the storage controller migrates the data to be migrated from the source SSD to the one or more destination SSDs.