12-27-2016
The fans are controlled by the service processor due to the enviromental conditions. If something is of with the fans, a firmware update might help.
So updating the ALOM and OBP to latest level might solve your problems.
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http://zone11.codemicroinc.netdna-cdn.com/large_1054367.jpg
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mbmon(1) General Commands Manual mbmon(1)
NAME
mbmon - MotherBoard Monitor
SYNOPSIS
mbmon [options] <seconds for sleep> (default 5 sec)
This manual page documents briefly the mbmon command. This manual page was written for the Debian distribution because the original pro-
gram does not have a manual page.
Recent motherboards have functionalities to monitor the CPU temperatures and the frequency of CPU cooling fans etc. Although some programs
utilizing these hardware monitoring facilities have been developed for the Microsoft Windows platforms, no programs seem to exist for PC-
UNIX and the X Windows System platforms.
mbmon used at the command line reports the temperatures, voltages and rpm (rounds per minute) of cooling fans. It can also be used remotely
via telnet, thanks to the "-P" option.
OPTIONS
-h Show summary of options.
-V, -S, -I, -A
Access method (using "VIA686 HWM directly"|"SMBus"|"ISA I/O port"|"All this methods").
-d Debug mode (any other options except (V|S|I) will be ignored).
-e [0-2]
set extra temperature sensor to temp. Need -A.
-p chip
For probing chips. chip=winbond|wl784|via686|it87|gl52|lm85|lm80|lm90|lm75
-Y For Tyan Tiger MP/MPX motherboard.
-f Display temperature in Fahrenheit.
-c count
Repeat <count> times and exit.
-P port
Run in daemon mode, using given port for clients.
-T|F [1-7]
print Temperature|Fanspeed according to following styles:
style1: data1
style2: data2
style3: data3
style4: data10ata2
style5: data10ata3
style6: data20ata3
style7: data10ata20ata3
-r Print TAG and Value format.
-u Print system uptime.
-t Print present time.
-n, -N print hostname (long|short style).
-i Print integers in the summary (with -T option).
EXAMPLES
mbmon -P 11000; telnet localhost 11000; sudo killall mbmon
mbmon -c1
mbmon 1 (yeah, real time baby !)
SEE ALSO
/usr/share/doc/mbmon/*
AUTHOR
This manual page was written by Nicolas Rueff <n.rueff@tuxfamily.org>, for the Debian project (but may be used by others).
November 10, 2003 mbmon(1)