Image shows the layout of the servers and switches in Oracle Exadata Storage Expansion X3-2 Quarter Rack. From the bottom to the top of the rack, the layout is as follows:
U1: Sun Datacenter InfiniBand Switch 36
U2 - U9: Exadata Storage Servers
U20: Sun Datacenter InfiniBand Switch 36
U21: Cisco switch
U22: Sun Datacenter InfiniBand Switch 36