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C-8 SPARC Enterprise M4000/M5000 Servers Service Manual • August 2009
There are two fans in each power supply unit.
The SPARC Enterprise M5000 server has a I/O backplane/power backplane/busbar
unit, located near the center of the lower half of the system, which provides these
functions:
■ Power conductor to the power supply backplane, fan backplane, power supply
backplane, and motherboard unit
■ Connectivity between the various backplanes and the motherboard with FRUs
and system components
Refer to Chapter 7 for replacement procedures.
C.6 FAN Module
The fans in the midrange servers move air currents into and out of the server. If one
fan fails, the eXtended System Control Facility (XSCF) detects the failure and uses the
redundant fan(s). Both servers use 172-mm fans (FAN_A) as the primary cooling
system. The 60 mm fans (FAN_B) in the SPARC Enterprise M4000 server are used for
additional cooling.
TABLE C-6 describes the fan features.
Volt ampere
2,058 VA 3,815 VA
Power draw (maximum)
2,016W (2 power cords) 3,738W (4 power cords)
Heat
6,879 BTUs/hr (7258 kJ/hr) 1,2754 BTUs/hr (13457 kJ/hr)
TABLE C-6 Fan Module Features
SPARC Enterprise M4000 Server SPARC Enterprise M5000 Server
Number of fans
4 fans
• 2 172-mm fans
• 2 60-mm fans
4 172-mm fans
Fan location
172-mm fans—Top of system near
the front
60-mm fans—Top of system
Above the power supply units
Top of system near the front
Active replacement
capability
Yes Yes
TABLE C-5 Power Supply Features (Continued)
SPARC Enterprise M4000 Server SPARC Enterprise M5000 Server