ML370 G5 Fan Speed

[stuart errington]

My server got warm yesterday and the cooling fans have speeded up as normal, however the room is now back to a cool temperature but the fans are still spinning like crazy? How do I slow them?

[Prabhulj]

Hi Stuart,
Looking for answers to control the Fan Speed.

I came across an Customer Support Notice, which states that the behaviour of Power Supply fan's in G5 servers are different from that of the previous ones.

Link:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c00772855&jumpid=reg_R1002_USEN

Regards,
Prabhu

[Prabhulj]

Hi Stuart,

System FAN Control:

For some ProLiant servers that include multi-speed fans, the HP ASM driver controls the speed of the system fans. When the internal ambient temperature of the server is high, the HP ASM driver ensures that the fans are running at high speed to allow proper heat dissipation. When the internal ambient temperature is within acceptable limits, the HP ASM driver decreases the speed of the fans. This helps to reduce server fan noise and preserve the life of the fans.

Without the HP ASM driver loaded, the system fans may constantly run at high speed.

Please check if you do have the HP ASM driver installed.

Refer Link :
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01236933&prodTypeId=15351&prodSeriesId=1121474

Regards,
Prabhu

[KarloChacon]

hi stuart

what you can do is clear NVRAM.
page 84 for location of the system maintenance switch - item 10

http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00710498/c00710498.pdf


procedure

1. Power down the server.
2. Remove the server cover.
3. Locate the System Maintenance Switch, position S6, and move the switch to the "On" position.
4. Power the server back on until Power-On Self-Test begins.
5. After POST has started, power-cycle the server off.
6. Move the System Maintenance Switch back to the "Off" position.
7. Replace the server cover and power on the system. The server will boot normally.

regards

[DanaPrewit]

Hi Stuart,

Just because we had this happen, I'll add my two cents. Run the system diagnostics and check the system temperature monitor readings. We had a failure that was causing the fans to continuously run at high speed with no indications that anything else was going on with the system. Turns out the board needed replacing because the monitor was reporting 100C for the system temperature! This happened after a heat up and cool down in the room. Fixed the monitor, no problems since.

Dana

[Brian_Murdoch]

Stuart,

Check the power supply revision levels and have them replaced by HP if they meet the bad revisions reported in this article.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1158001

If you have two psu's fitted and can't afford downtime, you can reset them by removing the power plug on one for a few seconds and then re-inserting it, then doing the same to the other psu. You won't need to shut the system down for this if you have dual power supplies.

Regards,

Brian

[hallasha]

Thank you Brian,

Your post gave me a clue I missed!

The backup power supply was making the noise and all I did is to unplug then plug again and everything is back to normal.

Regards,

hallasha