Image shows the layout of the servers and switches in Oracle Exadata Storage Expansion X3-2 and X4-2 Full Rack.
Front view, from the bottom to the top of the rack, the layout is as follows:
U1: Vented Filler
U2 - U19: Exadata Storage Servers
U20 - U22: Vented Filler
U23 - U40: Exadata Storage Servers
U41 - U42: Solid Filler
Rear view, from the bottom to the top of the rack, the layout is as follows:
U1: 36-Port IB Switch
U2 - U19: Exadata Storage Servers
U20: 36-Port IB Switch
U21: Cisco 4948
U22: 36-Port IB Switch
U23 - U40: Exadata Storage Servers
U41 - U42: Solid Filler