topic N-Class temperature in Operating System - HP-UX

N-Class temperature

ralf klausch — Thu, 12 Oct 2000 06:42:27 GMT

Hello,

how can I check the temperature of my HP N-Class. I need a text based tool.

Any Ideas.

Regards

Ralf

Re: N-Class temperature

Andreas Voss — Thu, 12 Oct 2000 06:53:09 GMT

Hi,

i think there is no unix tool to get the actual temperature. Only at GSP console you can see with PS the status where it says normally Temperature : Normal.

Additional i found this at document 26393dhtm:

What is the operating temperature range and heat dissipation for the
L-Class?
Here are the L-Class specs.

SPU Operating Temperature Range
Operating Temperature 5?- 35?C (41?- 95?F)
Operating Humidity 15% - 80%, non-condensing at 26?C (65?F)
Maximum rate of change 30% RH/hour

SPU Power Dissipation:
A maximally-configured N-Class server can currently dissipate as
much as 1283 watts, or 4375 BTU per hour or 1103 kcal per hour.
This translates to about one-half ton of cooling capacity per SPU.

--------------------------------------------------------------------------------

How does the L-Class system Overtemperature Detection and
Response work?
The L-series system has one temperature sensor. It is located on the Platform Monitor
board (U15) and it samples the incoming air temperature. There is no sensor that examines
the exhaust air temperature. The Platform Monitor board uses this temperature sensor to
determine how fast to run the cooling fans. The two 6" fans are speed controlled by the
Platform Monitor. The 4" fans always run at full speed. The power supply fans speed are
not controlled by the Platform Monitor but the if a power supply fan fails, it will report that
event to the Platform Monitor board.

If the ambient incoming air temperature exceeds 31 to 35 degrees C, the Platform Monitor
board will compensate by changing the fan speed of the two 6" fans and will send the
OVERTEMP_CRIT event to the operating system envd deamon.

If the incoming ambient air temperature exceeds 35 to 40 degrees C, the Platform Monitor
will exceed the OVERTEMP_EMERG value and send the appropriate message to the envd
daemon - which typically results in an OS shutdown.

If the incoming ambient air temperature exceeds 40 degrees C, the Platform Monitor will
turn off the DC power in the SPU. It will not do a graceful shutdown - the ERS documents
report that it will "immediately turn off power".

The L-Class system envd does not monitor fan failures. If a fan fails the Platform Monitor
will put the two 6" fans into high speed and log the event in the GSP. If two fans go out,
the Platform Monitor will power off the system

Regards

Re: N-Class temperature

John Palmer — Thu, 12 Oct 2000 07:28:26 GMT

Hi,

Do you need to get the information from a script?

If so then one possibility is to connect the GSP LAN interface and use 'expect' to drive a telnet connection to it and extract the information.

Regards,
John

Re: N-Class temperature

ralf klausch — Thu, 12 Oct 2000 07:32:21 GMT

Hi John,

is there no tool in the operating system ? like EMS or support tools ? Are they any scripts.

regards

ralf

Re: N-Class temperature

John Palmer — Thu, 12 Oct 2000 09:55:21 GMT

Hi,

Not that I am aware of. However EMS is able to obtain information about the status of power supplies so it ought to be capable of interrogating the temperature as well. However as per the earlier post, I suspect that the only value that you can obtain is OK - or not in which case the server will have shut down anyway.

Regards,
John

Re: N-Class temperature

Anonymous — Thu, 12 Oct 2000 10:22:38 GMT

What do you think of scanning syslog.log for envd messages? Ok, you don't get the current temp but at least sth if it's too warm.

RGDS
Thomas

[1] man envd

Re: N-Class temperature

ralf klausch — Thu, 12 Oct 2000 10:43:19 GMT

Yes, but at the moment I don't get any temperature message. I've read the envd man-pages, but I'am not sure that it works!
It would be fine, when I could get the temperature in celsius or fahrenheit.

regard

ralf

Re: N-Class temperature

Anonymous — Thu, 12 Oct 2000 11:08:25 GMT

"not sure that it works": just try it ;-)

-be prepared that your N-class shuts down
-Andreas' doc above says: "sensor ... samples the incoming air temperature"
-set up an experiment with a hair dryer!
-whatch your syslog (or whatever you configured in /etc/envd.conf )

BTW if you search the forum for "envd" you find multiple refs that it works fine :-)

RGDS,
Thomas

Re: N-Class temperature

ralf klausch — Thu, 12 Oct 2000 11:17:36 GMT

hi thomas,

I think thats not a good idea. the maschine is very productive. many people work with it.

regards

ralf

Re: N-Class temperature

Cheryl Griffin — Thu, 12 Oct 2000 12:14:36 GMT

For the Nclass, under Calculating Cooling Needs, Temperature and humidity specifications:
"you should measure the operating temperature and humidity directly in front of the cabinet cooling air intakes rather than check only ambient room conditions. "

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/N4000/N4000_top.html&con=/hpux/onlinedocs/N4000/00/00/31-con.html&toc=/hpux/onlinedocs/N4000/00/00/31-toc.html&searchterms=temperature&queryid=20001012-061017

Re: N-Class temperature

Anonymous — Thu, 12 Oct 2000 12:45:41 GMT

Hi Ralf,

a simulation of real error conditions is a good idea (at least for me :)- but I wouldn't do that in a productive environment, too.

However, it worked well for Simon:

[1]
http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0xc2ed6c96588ad4118fef0090279cd0f9,00.html

RGDS
Thomas