AIC J2012-01, Руководство пользователя, Страница: 59 / 96

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J2012-01User Manual Chapter 3 Sub-system Configuration Setup
3.6.5.7 How to manually change PWM (fan speed) for all Cooling elements
Cooling control element
BYTE/BIT 7 6 5 4 3 2 1 0
0
COMMON CONTROL
SELECT PRDFAIL DISABLE RST SWAP Reserved
1
RQST
IDENT
Reserved
2 Reserved
3 Reserved RQST FAIL RQST ON Reserved REQUESTED SPEED CODE
The "RQST IDENT" for Cooling is defined in the bit7, byte1 and the "REQUESTED SPEED
CODE" is defined in the bit2 ~ 0, byte3 of the "Cooling control element" in the SES
specification. Set "RQST IDENT" bit to disable the smart fan function, and then change
PWM or fan speed for all Cooling elements by setting the "REQUESTED SPEED CODE"
bits. Clear "RQST IDENT" bit to enable the smart fan function again. Please disable
the smart fan function before changing PWM or fan speed. Only Cooling element 0
supports this feature. We use the software package "sg3_utils" on Linux for example,
and have a SAS HBA and a cable to connect your host with the expander.
(A) Show the device for AIC Expander Controller (canister)
$ sg_map -i
/dev/sg2 AIC 12G 2U12SAS3swap 0c01
(B) Set "RQST IDENT" of Cooling element 0 to disable the smart fan function
$ sg_ses --descriptor=SystemCoolingElement01 --set=1:7:1 /dev/sg2
(C) Set "REQUESTED SPEED CODE" of Cooling element 0 to change PWM or fan
speed
for all Cooling elements. Set "REQUESTED SPEED CODE"=7 (100% PWM) for
example.
$ sg_ses --descriptor=SystemCoolingElement01 --set 3:2:3=7 /dev/sg2
REQUESTED
SPEED CODE
PWM
7 100%
6 90%
5 80%
4 70%
3 60%
2 50%
1 40%
0 Leave at current speed