DL380 variable fan speed

[martin van es]

We have 2 DL380 servers which run perfectly on windows2003. They are in a climate controlled room. So temperature is constantly low.

Beacause of this, there is no need for all 8 fans per server to be working on full power.

Is there a way (utility) to make the vans temperature controlled? so under normal conditions the vans turn a lot slower and thus produce less noise. right now they produce a lot op sound. this is totaly not neccesary.

Hope someone can help

[NMory]

Have you tried loading the latest BIOS on the server?

LN

1. https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_2b402b8cbf264e3d998d1f0d23

[martin van es]

yes, i have the latest bios...but...

I found out yesterday, that the fans ARE running on low speed :-S

In each server there are 8 fans. I read somewhere that the minimum amout of fans is 4, so i thought... what would happen when i pull out 4 fans.

So i opened the server and pulled out 4 fans. at first it looked ok, less noise and still more then enough airflow. But i noticed a red light come up in front of the server, and whitin a minute, the remaining 4 fans turned to high speed....!

Wow... i didn't know they can blow so hard... it was like a huricane in there!!

So the problemm is not that the fans not get turned down...beacasue they do...

But now the problemm is, that at the lowest speed, the fans still produce a lot of sound.
And i still don't see any reason why this should be this way.

first of all i think the fans themselves are pretty noisy. Why can they not put in fans that produce less sound? Normal computer fans produce far less sound.

second, i think the fans can be turned down even more. in the current state, the most slow rpm state of the fans, there is still A LOT of air moved thru the server. This is totaly un-necassary in a climate controled room. Why not implement real step-less variable fan-speeds depending on the temperature??

So...still the question remains...

Does anybody know how to get these servers a bit more silent???

[RGP]

What is the generation of DL380? is it a DL380 G2/G3/G4?

[martin van es]

They are 2 G4 servers...

[RGP]

I guess it is a G3 or G4...

With the Health Driver loaded and Thermal Shutdown enabled in RBSU, the Health Driver performs an orderly shutdown if it detects a cautionary temperature level. If the server detects a critical temperature level before the orderly shutdown occurs, the server performs an immediate shutdown.

Additionally, the Health Driver performs an orderly shutdown if the following minimum requirements are not met: one working fan in the I/O zone, five working fans in the processor zone, and one working fan in the power supply zone.

With the Health Driver loaded and Thermal Shutdown disabled in RBSU, the server performs an immediate shutdown if it detects a critical temperature level.

Without Health Driver loaded, the server performs an immediate shutdown if it detects a critical temperature level.

So.. I am coming at disabling the Thermal Shutdown & unload the Health Driver.. at your risk!!!

[martin van es]

Ok... so it was normal for the server to shut down when i pulled out 4 fans. :-)
It performed a normal shutdown.

Disabling the Termal Shutdown and unloading the Health Driver is not something i would like to do.

If i do this...there is no control over the server temperature... so i guess the fans wil not speed up if the temperature rises.

maybe i think to simple, but :
The fans can be software controlled i guess.

so why is it not possible to write a simple little program that controls the fan speed according to the server temperature?

Programs that can do this for desktop pc's (like speedfan) don't recognise the fan control on the server.

[RGP · Accepted solution]

The ProLiant DL380 G4 features hardware fan control. With earlier fan control versions, the fan ran at 100% speed when the server was started. The fan stayed at 100% speed until the system health driver was installed and took control of the fan. For customers who chose not to install the system health driver, the fan continued to run at 100% speed all the time. In the ProLiant DL380 G4, the system PAL automatically initializes the fan at low speed and a temperature-sensing device begins monitoring conditions inside the server as soon as the server is started. There are temperature-sensing devices in each of three zones; I/O, processor, and power supply. When any of these zones reaches a predefined limit, the fans in that zone are kicked to 100% to ensure proper temperature control in the system. A hand-off of fan control occurs when the system health driver is installed or removed. Once installed, the health driver lets the system PAL know that it is ready to take over and all fan control is handed over to the health driver. If the health driver is uninstalled or turned off, fan control is handed back over to the system PAL. One advantage of using the health driver for fan control instead of the system PAL is that the health driver has the capability to step the fan speed up and down in increments to account for changes in temperature. The System PAL only knows two speeds: low and full.

[martin van es]

ok... that is a good explanation. Thank you.

But then i have a next question....
Can the health driver step down the fans below the "LOW" point of the system PAL?

And how do i check if the health driver is loaded?

[RGP]

Hey Martin,

That was good question....

You can not change the fan settings with the Health Driver. It is automatic...

You may check the SMH .. if you find the temparature and fan speeds there.. you can be sure that the health driver is loaded.
I am not sure abt the device manager / services.. :(

In case of Servers its better to let the health driver / hardware controle the temparature and fan speeds because they are "Servers" which run 24*7 - 365 days in a Server Room! Noise is not a major concern but reliability and performance is..unlike Desktops!