1. A memory system, comprising, a plurality of system controllers, at least some of which are operable to receive commands or data from an external user; a plurality of memory controllers communicating with at least some of the plurality of system controllers, at least some of the memory controllers are configured to store data using RAID; and a plurality of memory modules, wherein a group of memory modules is associated with a memory controller of the plurality of memory controllers and at least some of the group of memory modules form a RAID group, or a group of at least some of memory modules of plurality of memory controllers form the RAID group; wherein a same command from a system controller of the plurality of system controllers is dispatched to at least some of the memory controllers of plurality of memory controllers where the memory modules form the RAID group and a unique global serial number (GSN) is assigned to the same command at each of the memory controllers that have received the same command once all instances of receipt of the same dispatched command have been acknowledged to the system controller of the plurality of system controllers by each of the memory controllers receiving the same command.