Image shows the layout of the servers and switches in the full rack. From the bottom to the top of the rack, the layout is as follows:
Power Distribution Unit-B
Power Distribution Unit-A
Sun Datacenter QDR InfiniBand Switch (rear), 1U Vented Filler (front)
U1 - U19 Big Data Appliance Servers
U20: Sun Network QDR InfiniBand Gateway Switch (rear), 1U Vented Filler (front)
U21: Cisco Ethernet Administration Switch (rear), 1U Vented Filler (front)
U22: KVM Switch (rear), 1U Vented Filler (front)
U23: KVM LCD (rear), 1U Vented Filler (front
U24: Sun Network QDR InfiniBand Gateway Switch (rear), 1U Vented Filler (front)
U25 - U42: Big Data Appliance Servers