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76 Sun Fire V490 Server Administration Guide • August 2004
FIGURE 6-1 Simplified Schematic View of a Sun Fire V490 System
Consider also that some diagnostics must function even when the system fails to
start. Any diagnostic capable of isolating problems when the system fails to start up
must be independent of the operating system. But any diagnostic that is
independent of the operating system will also be unable to make use of the
operating system’s considerable resources for getting at the more complex causes of
failures.
Memory
Data
Switch
Processor
Memory
Processor
Memory
Data
Switch
Processor
Memory
Processor
CPU / Memory Boards
Centerplane Board
5-Way Data Switch
I/O
Bridge
I/O
Bridge
I/O
Bridge
Boot Bus
Other I/O
Boot
PROM
Boot Bus
Controller
Disk
Controller
(reserved)
PCI Slots
Power
Supply
Power
Supply
Fan
Fan
DVD Controller
PCI
Riser
Board
I
2
C Bus
Ethernet
Controller
Ethernet
Controller
USB
Controller
EBus
EBus EBus
TTYA
HSSDC, USB, & Ethernet I/O
SC
IDPROM
Boot Bus