Sun Microsystems V490 manual About the PCI Cards and Buses, Configuration Rules

TABLE 3-1Association Between Processors and DIMM Groups (Continued)

		Associated Local DIMM
CPU Number	CPU/Memory Slot	Groups
CPU 1	Slot B	B0, B1
CPU 2	Slot A	A0, A1
CPU 3	Slot B	B0, B1

Configuration Rules

■DIMMs must be added four-at-a-time within the same group of DIMM slots; every fourth slot belongs to the same DIMM group.

■Each group used must have four identical DIMMs installed—that is, all four DIMMs must be from the same manufacturing vendor and must have the same capacity (for example, four 512-Mbyte DIMMs or four 1-Gbyte DIMMs).

For guidelines and complete instructions on how to install DIMMs in a CPU/Memory board, see the Sun Fire V490 Server Parts Installation and Removal Guide.

Note – Do not attempt to access any internal components unless you are a qualified service technician. Detailed service instructions can be found in the Sun Fire V490 Server Parts Installation and Removal Guide, which is included on the Sun Fire V490 Documentation CD.

About the PCI Cards and Buses

All system communication with storage peripherals and network interface devices is mediated by two Peripheral Component Interconnect (PCI) bridge chips, located on the system’s centerplane. Each bridge chip manages communication between the system’s main interconnect bus and two PCI buses, giving the system a total of four separate PCI buses. The four PCI buses support up to six PCI interface cards and four centerplane devices.

TABLE 3-2describes the PCI bus characteristics and maps each bus to its associated bridge chip, integrated devices, and PCI card slots. All slots comply with PCI Local Bus Specification Revision 2.1.

Chapter 3 Hardware Configuration 31