On 13-03-15 04:18 PM, Jeff Johnson wrote:
Greetings,
I'm beating my head against the desk trying to use sg_ses to change the cooling
control element requested speed code for a fan connected to an LSI SAS2X36 SAS
expander.
I have tried the raw->edit<-raw method and tried the --data/--index/--control
method and neither seems to work.
Polling status for the cooling element (--index=26) gets me:
Element 26 descriptor:
Predicted failure=0, Disabled=0, Swap=0, status: OK
Ident=0, Hot swap=0, Fail=0, Requested on=1, Off=0
Actual speed=4920 rpm, Fan at lowest speed
Issuing the following command doesn't change the rpm speed:
'sg_ses --page=0x2 /dev/sg1 --index=26 --control --data=70,00,00,27'
Per the SES spec that string should select "Fan at highest speed".
I have also tried taking the raw output, editing the bytes for the element and
sending it back and it also does nothing. The sg_ses command succeeds but there
are no intended results.
Am I using the command syntax correctly? I want to be sure before I go after the
vendor for improper support of the SES specification.
Jeff,
Assuming you have a recent version of sg_ses, say from
sg3_utils version 1.35:
# sg_ses -V
version: 1.70 20121211
Try this:
# sg_ses --index=coo --set=3:2:3=7 /dev/sg1
That assumes there is only one cooling element. If there are more
then:
# sg_ses --index=coo,0 --set=3:2:3=7 /dev/sg1
# sg_ses --index=coo,1 --set=3:2:3=7 /dev/sg1
etc. **
Also the SES device embedded in that expander communicates with your
array using SGPIO (see wikipedia). I hoping you know that and have
the correct cable(s). I have a cheapie Supermicro array and it doesn't
take much to trip up SGPIO here, connecting more than two SAS disks
is usually enough. On a good day I can set the ident LEDs and sound
the warning. I'd love to be able to slow down its !@#$ fan :-)
[It doesn't have a cooling element.]
Doug Gilbert
** I could introduce the element name speed_code so that becomes:
# sg_ses --index=coo --set=speed_code=7 /dev/sg1
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