2 LPARs (minimum for hardware failure survival) - 2+ TORs (one per LPAR minimum, more if channel separation is needed) - 4+ AORs (active/active pairs, at least one pair per primary channel) - 1+ FOR (if VSAM is used; optional if all data is in DB2 with data sharing) - 2 CMASs (one per LPAR for CPSM