FAN rpm incorrect, fixed

[getmythe]

To all of you using a replacement fan! Did you notice that the rpm values are to low?

I tried three different brands of fans and each time I noticed that the rpm values are only half of what I expected. While sifting through the firmware I found the reason: File /img/htdocs/adm/system.htm contains the following piece of code


if (preg_match("/FAN 1 RPM: *(\d*)/",$stat[$i], $matches)){                                            
   $fan_rpm= round($matches[1]/2);                                                                    
}                                                                                                      
if (preg_match("/FAN 1 top RPM: *(\d*)/",$stat[$i], $matches)){                                        
   $top_rpm= round($matches[1]/2);                                                                    
}                                                                                                      


I have modified the SSH module from mshapf such that the correct values are shown. If I can find a guinea pig who is willing to test my module I can distribute it later.

[getmythe]

since I could not find any issues with the module, here it is

www.freeside.ch/thecus/FANRPM.mod.tgz

Download, gunzip, untar, install file FANRPM.mod and enable it, done!

[mshapf]

So what about the fan that comes with the N2100 ? Does it report correct RPM? In other words, is it a general bug or is the module only for replacement fans?

M.

[getmythe]

When I apply the FANRPM patch my 60mm Pabst rated 2200 rpm correctly displays around 2200 rpm when hooked up to the 12V power supply line. A SlienX 60 mm fan rated 2000 rpm will also display roughly 2000 rpm using the patched code. The original ADDA fan provided by Thecus will display around 10600 rpm when hooked up to the 12V power supply line; A value which cannot be correct. I can only assume that the ADDA delivers twice as many pulses per revolution as opposed to most other fans.

E.g. use the patch only if you replace the stock fan!

[chemist]

I have a problem with this module in combination with ml_donkey. The problem I have is already described on the forum, but I was unable to find a solution.

What I see happening is that over time a lot of processes are started which stay active .. This starts eating away my memory to the point where I can no longer access my web interface and a reboot is needed

My guess (although it is more a hunch) that it has something to do with the temperature logging of the module ...

Is there a workaround for this problem ?
Since I have no need for temp logging; is it possible to create a FANRPM module without the temp logging (or can I in some way remove it myself via an editor) ?

[tonosity]

Has anyone experienced the N2100 fan turning on and off continuously. At least, believe it's the fan. In any case, something--ether the fan or the disks--spin up and down at intervals of about 15 seconds, after the unit has been powered up for about 5 minutes. Very annoying.

I have it configured as RAID, with two WD 500Gb Raptor drives.

Any insight on this would be appreciated. Thanks!

[lordmyschkin]

Can it be that this module itself does help keeping my tmerperature low?
After installing this (great) mod, my hdd temperature dropped from 58 to much more comfortable 51 Degrees.
are there any not-to-invasive -Mods to lower it further?

Regards!