By "pairs", does that mean a pair in each bank, where a "bank" is the group of 6 slots on each side? Therefore, any and all RAM upgrades have to be in 4s?
(Sorry, I'm physically separated from the servers to look at them and see where the DIMMs are. I don't know where the DIMMs are... 6 on one side, 3 vs 3...)
How do I query the DIMMS for their registered/unregistered/buffered status? Server(s) are running XenServer, FWIW.
Thanks for the guidance, you've already stopped me from doing something regrettable.