1-10 SPARC Enterprise M4000/M5000 Servers Overview Guide • December 2010
1.3.1 Motherboard Unit
Themotherboard 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
Toremove and replace the motherboard and these components, you must power the
server off. For more details on the motherboard unit, refer to the SPARCEnterprise
M4000/M5000 Servers Service Manual.
Power supply unit Yes Yes Yes Yes
Bus bar,I/O backplane, and power backplane unit
(M5000 server)
No Yes
I/O backplane and power backplane unit (M4000
server)
No Yes
Harddisk drive No Yes Yes Yes
Tapedrive unit (optional) No Yes Yes Yes
CD-RW/DVD-RWdrive unit No Yes
Operator panel No Yes
TABLE1-3 FRU Components for Both Midrange Servers (Continued)
Component Redundant
Cold
Replacement
Hot
Replacement
Active
Replacement