Sun Storage Array, yet again

I have two of these: http://sunsolve.sun.com/handbook_pub/Systems/SSA_219_7Slot/SSA_219_7Slot.ht… Each has a pair of PSU's in it. I assume for redundancy. However, the PSU's in one unit are strappable 110/220VAC while those in the other unit are 220VAC. <frown> If the PSU's are just redundant and aren't actively load sharing, then I *should* be able to swap one 110/220VAC for a 220VAC and run each array off a single supply (taking care to hack the sense signal for the second supply so the array doesn't continually report a supply failure). Am I missing anything here? Granted, the two supplies possibly *do* share the load as a side-effect in normal operation. But, I assume the intent was for a single PSU to be capable of powering the entire device in the event of a failure in the "other" PSU? Thanks! --don