Luca,
Does the need to insure site specifc storage apply if network raid 2 is being used? When I asked the VAR installer where any luns created would "live" he said everywhere, that they would be spread across both sites.
It sounded to me as though the six nodes divided between the two sites would be seen as, and used as, one aggregate by the lefthand software. But admittedly, the more I read, the more confused I seem to get.