Figure 6-45 Installing the PCIe Expansion Board
4.
Replace the top cover. See
“Replacing the Top Cover” (page 145)
.
5.
If rack mounted, slide the server completely into the rack. See
“Inserting the Server into the
Rack” (page 144)
.
6.
Reconnect the power cables, and power on the server. See
“Powering On and Powering Off
the Server” (page 78)
.
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 that is 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 (assist with cooling and ease cable management issues).
•
Increased scalability (expanders enable support for thousands of SAS devices).
196
Removing and Replacing Server Components
