Sun Microsystems SPARCengine Ultra AXi, Technical Manual

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Chapter 2 Specification Summary 2-9
Shutdown 58
°
C
2.1.14.2 Fan Monitoring and Control
Fan Control Both fans controlled simultaneously
Fan Speed Four Steps: 8 V, 10 V, 11 V, 12 V
Control Matrix
Monitoring Individual Fan Fail Warnings (Back Fan Fail), (Front
Fan Fail)
Front/CPU Cooling Fan
The CPU fan is required and supplied by Sun for CPU modules with straight fin
heatsinks (e.g., 360 MHz, part number 501-5148-xx; 440 MHz, part number 501-5149-
xx). Refer to FIGURE C-6 on page C-9 and FIGURE C-7 on page C-10 for
configuration information. An OEM-supplied front fan may also be required with
CPU modules with pin fin heatsinks depending on system thermal characteristics.
Boot Command Used
env-monitor
Setting
[1]
1. Applicable to the Solaris level only for fan speed control. The fans always run at 12 V at the OBP level. Refer to
Appendix D.14 “ASM Operation” for the definition of the
env-monitor
settings.
boot boot -r
[2]
2. The boot -r reconfiguration command is required each time the machine is booted to attach the ASM driver.
enabled-with-fans
12 V Fan voltage depends on measured temperature
readings:
enabled
12 V 8 V
disabled
12 V 12 V
disabled*
12 V 12 V
Reading of
thermistor under
CPU module
heatsink
Voltage to
Front/CPU Fan
(J3603)
Voltage to
Back Fan
(J3602)
0
o
C — 27
o
C 8 V 8 V
28
o
C — 39
o
C 10 V 10 V
40
o
C — 51
o
C 11 V 11 V
52
o
C — 111
o
C 12 V 12 V