8.
Replace the top two right-side bezel screws.
9.
Replace the DVD drive. See
“Replacing the DVD Drive” (page 202)
.
10. Reconnect the USB cable into the connector on the display board.
11. Replace the air baffle.
12. Replace the top cover. See
“Replacing the Top Cover” (page 179)
.
13. If rack installed, slide the server completely into the rack. See
“Inserting the Server into the
Rack” (page 177)
.
14. Reconnect the power cables and power on the server. See
“Powering On the Server” (page 90)
.
Removing and Replacing the SAS Backplane Board
Serial-attached SCSI (SAS) is a new, faster version of the industry standard SCSI technology.
Although SCSI is a proven technology, its parallel data communication model restricts it from
providing the speed and scalability required for modern data transfer and storage. In a parallel
data communication environment, multiple devices share one bus; all data travels over the same
cable and through the same port.
SAS provides serial, or point-to-point, data transfer. A point-to-point architecture means that each
device has its own private bus, cable, and port. This architecture improves the reliability and
availability of data, and greatly enhances data transfer rates. Current data transfer rates are 3
Gb/s. Additional features of the SAS technology include:
•
Full-duplex capability (all data reads and writes occur simultaneously)
•
Automatic device discovery and configuration (each device is assigned a unique SAS address)
•
Thin cables and small connectors (assists with cooling and ease cable management issues)
•
Increased scalability (expanders enable support for thousands of SAS devices)
The server ships standard with two SAS backplane boards. The primary SAS backplane board
connects to the primary SAS core I/O card in slot 1. If there are two SAS core I/O cards, the
secondary SAS backplane board connects to the secondary SAS core I/O card.
IMPORTANT:
The number of SAS core I/O cards determines the SAS configuration. In a single
SAS core I/O card configuration, the secondary set of SAS cables connect to the secondary SAS
backplane, but are routed and lay loose in the server I/O backplane area.
Table 77
lists the SAS configurations.
Table 77 SAS Configurations
SAS Cables
Connected
SAS Cables
Shipped
SAS Backplane Boards
SAS Core I/O Card
Location
SAS Core I/O
Cards
2
4
2
Slot 1
1
4
4
2
Slot 2
2
The SAS backplane boards attach to an interconnect board that functions as a link between the
midplane board and the SAS backplane boards.
WARNING!
Ensure that the system is powered off and all power sources have been disconnected
from the server prior to performing this procedure.
Voltages are present at various locations within the server whenever an AC power source is
connected. This voltage is present even when the main power switch is in the off position.
Failure to observe this warning can result in personal injury or damage to equipment.
CAUTION:
Observe all ESD safety precautions before attempting this procedure. Failure to follow
ESD safety precautions can result in damage to the server.
242 Removing and Replacing Server Components
