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1-10 SPARC Enterprise M4000/M5000 Servers Overview Guide • August 2009
1.3.1 Motherboard Unit
The motherboard unit (FIGURE 1-6) is the main circuit board in both midrange
servers. The following components connect to the motherboard unit:
■ CPU modules (two CPU chips per module)
■ Memory boards
■ Bus bar, I/O backplane, and power backplane unit (SPARC Enterprise M5000
server only)
■ I/O unit(s) through the I/O backplane
■ eXtended System Control Facility Unit (XSCFU) through the bus bar, I/O
backplane, and power backplane unit
To remove and replace the motherboard and these components, you must power the
server off. For more details on the motherboard unit, refer to the SPARC Enterprise
M4000/M5000 Servers Service Manual.
Power supply unit Yes Yes Yes Yes
Bus bar, I/O backplane, and power backplane unit
(SPARC Enterprise M5000 server)
No Yes
I/O backplane and power backplane unit (SPARC
Enterprise M4000 server)
No Yes
Hard disk drive No Yes Yes Yes
Tape drive unit (optional) No Yes Yes Yes
CD-RW/DVD-RW drive unit No Yes Yes
Operator panel
No Yes
TABLE 1-3 FRU Components for Both Midrange Servers (Continued)
Component Redundant
Cold
Replacement
Hot
Replacement
Active
Replacement