@usmansa1 wrote: can we stack 2930M (JL322A) with 2930F (JL256A) ?
Short answer: No, you can't.
Long answer: Aruba 2930M and Aruba 2930F adopt totally different virtual switching technology (also known simply as "stacking") and those technologies can't be mixed to form "a" stack (they can inter-operate but not mixed).