There is one physical box down, which means that several WS virtual interfaces are down. Our sysadmins are working on it and have given us a 6 hour ETA for it coming back up.
UPDATE 8pm pacific time Fri Mar 18: The server is still going through its RAID arrays (it has many of them and they are very large). Our admins think this will require several more hours, putting the ETA at Saturday assuming all goes well.
UPDATE 5:30am pacific time Sat Mar 19: The server came up an hour ago and looks to be running ok now.