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PostPosted: Wed Jun 25, 2008 4:41 pm 
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JohnBick wrote:
It is my intent to write this up for the wiki...

That's great news! :D... there's a few forum topics I should have migrated over to the wiki by now but I still haven't gotten around to doing it. Maybe someone will do another one for me if I delay further :P

Instead, I've been fiddling with AlternativeOS's (OpenSolaris, FreeNas/BSD) but without the results I was hoping for... Hardware Compatiblity Issues with FreeNAS/BSD and 'not quite the configuration I want' issues with OpenSolaris. What's nifty about FreeNAS is that it would be small enough to fit on the onboard flash memory! I'm still hoping to find a way to get a slick ZFS setup going but I might abandon if/when HP publishes the fix for the corruption bug.

And on that (off)topic, cakalapati will some day have some very cool contributions to make on the linux front. 8)


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PostPosted: Fri Jul 04, 2008 1:44 pm 
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We now have a far better alternative than anything mentioned previously in this thread: MSS Fan Control from our founder and hero, Yakuza! Discussion of that can take place in a new thread: http://www.mediasmartserver.net/forums/ ... highlight=. I encourage you all to check out the thread and use the Add-In.

Yakuza has done a fine job on this Fan Control. SpeedFan and other tools have a problem because they are controlling the fans directly. As a result, when the HP software on the MSS determines that a temperature threshold has been crossed (either increasing or decreasing temperature) it asserts it's control and sets the fan speed as dictated by the MSS registry values -- overriding SpeedFan (et al). If, for example, uou use SpeedFan to force a 100% (2500rpm) fan speed and the CPU temperature gors up to 55C anyway, the fans will slow down as the default MSS settings issue new commands. SpeedFan (et al) is unaware of this and cannot adjust accordingly.

Yakuza's Add-In changes the registry values associated with the MSS fan controls and then allows the HP logic to control the fan speeds as it has all along. Now if you set the fan speed to be "fixed" at 100% that speed will be applied for the entire temperature range. If you set it for 75% then it will remain at 75% -- with one caveat: if the temperature exceeds the upper bounds of the HP controls then the HP speeds are left in place to prevent damage to your unit. (I.e., if you really need that 100% you get it! There may be some changes in this logic going forward so I am not going to try to explain the current logic, only point out that there is a safety net there.)

This is a much better approach that the alternative approaches and certainly easier than computing values, manually editing the registry and then restarting the MSS. I highly recommend this approach over all the others I have seen.

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PostPosted: Mon Jul 14, 2008 11:38 pm 
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As requested over in the "Temperature alerts" thread, I've posted some pictures (front and back) of the SATA backplane.

These photos were big, but ImageShack resized them. Gotta get them under 1.5 MB each, I guess. I'll try harder tomorrow; this has frustrated me enough for tonight!

Edit: Here are the new, full-size versions:
Image
Image


Last edited by Karyudo on Tue Jul 15, 2008 11:39 pm, edited 1 time in total.

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PostPosted: Tue Jul 15, 2008 1:21 pm 
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Can anyone locate a temperature sensor on the photos above?

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PostPosted: Tue Jul 15, 2008 1:57 pm 
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The sensor is the red surface mount, I believe labeled R10. It's under the top drive in the center, on the back side of the board.

I thought that was it for a while, but didn't have a good way to verify until today when I had the system running at 33C, I stuck my little finger on an icecube for a minute then place it on the sensor and it instantly dropped to 25C.

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PostPosted: Tue Jul 15, 2008 3:02 pm 
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yakuza wrote:
The sensor is the red surface mount, I believe labeled R10. It's under the top drive in the center, on the back side of the board.

Good to know...! Thanks...

By "back side" do you mean "component side" in this case? I am trying to locate a "red spot" in the pictures posted by Karyudo. (Can you add a pointer to the appropriate picture?)

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PostPosted: Tue Jul 15, 2008 3:49 pm 
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Here, this should help.


Attachments:
backplane temp sensor.jpg
backplane temp sensor.jpg [ 52.37 KiB | Viewed 22994 times ]

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PostPosted: Tue Jul 15, 2008 6:27 pm 
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Thanks! It does answer the question!

I wonder if any of the other "temperature problems" might also be a bad connection to the motherboard, one introduced in the factory (or shipping) rather than by user dis-assembly? I posted a comment about that on another thread...

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PostPosted: Tue Jul 15, 2008 11:41 pm 
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As promised, I've upped new, larger versions of my photos. I edited my original post of yesterday, rather than cluttering things up here.


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PostPosted: Wed Jul 16, 2008 7:10 am 
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Karyudo wrote:
As promised, I've upped new, larger versions of my photos. I edited my original post of yesterday, rather than cluttering things up here.

THANKS! Now we can really see that temperature sensor clearly!

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PostPosted: Thu Jul 17, 2008 4:37 pm 
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I was looking for a semiconductor sensor not a thermistor but now it is clear.

Uses a voltage divider R12 (resistor) & R10 (thermistor) filtered by C5 (capacitor). It is interesting to note that the track leads to an exact duplicate divider before heading off to the lower connector. This is made up of R11, R9 & C4 and would have averaged the temperature over two measure points but it is left unpopulated on the card.

jarrod


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PostPosted: Thu Jul 17, 2008 5:08 pm 
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jarrods wrote:
I was looking for a semiconductor sensor not a thermistor but now it is clear.

Uses a voltage divider R12 (resistor) & R10 (thermistor) filtered by C5 (capacitor). It is interesting to note that the track leads to an exact duplicate divider before heading off to the lower connector. This is made up of R11, R9 & C4 and would have averaged the temperature over two measure points but it is left unpopulated on the card.

jarrod


Thanks for the technical details, Jarrod, you can tell I'm more software oriented since I stuck my ice-cube cooled finger on it while the system was running to see if the temp changed. :lol:

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PostPosted: Thu Jul 17, 2008 5:41 pm 
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Thanks for the technical details, Jarrod, you can tell I'm more software oriented since I stuck my ice-cube cooled finger on it while the system was running to see if the temp changed.


Ya know, that was actually impressive to me...a real test of logic and deductive reasoning...I thought that was some time-tested method. Now I find it was Yakusa-Science. And, hey, it worked! Still impressed. But Yak, like the.338 test.....

:lol:

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PostPosted: Thu Jul 17, 2008 6:09 pm 
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He must be a Software ENGINEER -- or a Test ENGINEER. Practical solutions for a read world. (Spoken by an engineer, by the way, one with a license to prove it, too!)

By the way, since it is more "blessed to give than to receive", Plan B is to give .38 or .45 shots milliseconds before the ones to the back are released! Moral: You must face your problems in life!

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PostPosted: Thu Jul 17, 2008 6:13 pm 
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jarrods wrote:
I was looking for a semiconductor sensor not a thermistor but now it is clear....

NICE pic, by the way... Thanks!

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