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Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing a Modular Drive Bay Assembly
The server allows modular configuration of the drive bays, so that you can use one or two drive bays
depending on your needs.
Each drive bay assembly includes the chassis-steel drive bay, the attached drive backplane, and a
transition card (expander or nonexpander version) that provides a connection to your RAID controllers
and the motherboard.
• Each of the two modular chassis drive bays can hold up to eight 2.5-inch drives.
• Each drive backplane connects to one transition card. The transition card connects the drive
backplane to the motherboard and connects to cables from your RAID controller.
• The transition card is available in two versions:
–
Nonexpander—Two internal connections to the RAID controller card are required to control
eight drives. This version includes two connectors for the cables from your RAID controller.
One connector allows control of drives 1 through 4 on the backplane. The other connector
allows control of drives 5 through 8 on the backplane.
–
Expander—One internal connection to the RAID controller card is required to control eight
drives. This one connector allows control of drives 1 through 8 on the backplane.
• To use more than eight 2.5-inch drives in the server (up to 16), two drive bay modules are required,
each with its own backplane and transition card.
Figure 3-8 Drive Bay Assembly and Transition Card (Two Versions)
1 Chassis drive bay module (rear view) 4 Transition card securing screws (two)
2 Drive backplane 5 Transition card connector to motherboard
3 Transition card (nonexpander version) 6 Transition card (expander version)
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