3. hard drive connectors 1, 2 and 3 for system 
board 2 (from top to bottom)
4. hard drive connectors 1, 2 and 3 for system 
board 3 (from top to bottom)
5. hard drive connectors 1, 2 and 3 for system 
board 4 (from top to bottom)
Figure 86. Back view of the 3.5 inch hard drive backplane
1. backplane power connector for power supply 
unit 1
2. 1x8pin fan controller board connector
3. SGPIO connector 4 for system board 4 4. SGPIO connector 3 for system board 3
5. SGPIO connector 2 for system board 2 6. SGPIO connector 1 for system board 1
7. backplane jumper 8. SATA2 and SAS connectors 1, 2 and 3 for 
system board 1 (from top to bottom)
9. SATA2 and SAS connectors 1, 2 and 3 for 
system board 2 (from top to bottom)
10. SATA2 and SAS connectors 1, 2 and 3 for 
system board 3 (from top to bottom)
11. SATA2 and SAS connectors 1, 2 and 3 for 
system board 4 (from top to bottom)
12. backplane power connector for power 
supply unit 2
Figure 87. Front view of the 2.5 inch hard drive backplane
1. hard drive connectors 1 to 6 for system board 1 
(from left to right)
2. hard drive connectors 1 to 6 for system 
board 2 (from left to right)
3. hard drive connectors 1 to 6 for system board 3 
(from left to right)
4. hard drive connectors 1 to 6 for system 
board 4 (from left to right)
5. 2.5-inch backplane
143