Maximum supported temperature of devices ?

[FelicioGS]

The product guides (like the one of 7500 - http://www8.hp.com/h20195/v2/GetHTML.aspx?docname=c04111585 and the one of 5900 - http://www8.hp.com/h20195/v2/GetHTML.aspx?docname=c04111469) show only "operating temperature" as I undestand that is environment maximum supported temperature.

But I undestand that SNMP OID show internal device temperature and on "diplay environment" command there is a "warning", "alarm" and "shutdown" parameters with "shutdown" as NA (NotApplicable or NotAvailable?).

So how to evaluate if the temperature it's not recommended or how to define what is unsupported for network devices ? There is any public document that describe this ? There is any document or article correlating the "operating temperature" with internal (SNMP OID) temperature (it's not possible establish this from devices as 7500 had same "operating temperature" of 5900, but the "display environment" of 7500 it's 80/97c while 5900 it's 60/70c) ?

TIA,

Felicio Santos, CAPM

[sdide]

Hi,

The documents you refer to (i could only access the one for the 7500-series) talks about operating temperature

e.g (from the technical specifications of the 7500s)

"Environment, Operating temperature, 32°F to 113°F (0°C to 45°C)"

It says so in all the different entries for the different chassis. The 7500 is "just" a chassis. And basically it should be kept when operating (regardsless of what you put in the chassis) in an environment where the temperature is between 0°C and 45°C.

Now when it comes to the entries in

] display environment

or what you get via SNMP (which is by the way the same values) - those values are specific for a certain sensor that is placed near a cetain ASIC or CPU on s specific linecard or MPU. Hence these values for the sensors will differ, and so will the thresholds.

Example. HP-5130-24 (Comware 7 Ver. 7.1.045, R3106)

]display environment

System temperature information (degree centigrade):
----------------------------------------------------------------------
Slot Sensor Temperature Lower Warning Alarm Shutdown
1 hotspot 1 52 0 92 102 NA
1 hotspot 2 55 0 98 108 NA
1 hotspot 3 32 -20 63 70 NA
1 hotspot 4 25 0 110 130 135

As you can see they differ and that sensor 4 actually has a shutdown limit I guess NA means the unit does not shutdown no matter what the temperature of that sensor is.

Note that even tho the temperature in the surrounding environment is ok (0-45C) the different sensors can still get too hot (malfuction of component or fans, etc).

Another example is the HP 5700 ( Comware Version 7.1.045, R2311P04)

]display environment

System temperature information (degree centigrade):
-------------------------------------------------------------------------------
Sensor Temperature LowerLimit WarningLimit AlarmLimit ShutdownLimit
hotspot 1 36 0 84 94 NA
hotspot 2 36 0 84 94 NA
hotspot 3 29 0 53 58 NA

I have 7500's but only one type of linecard (the 48port SFP, LSQ1GP48SC) and the MPU LSQ1SRP2XB

They both only have 1 sensor and they both have the same limits, so it looks like this:

(Comware 5 Version 5.20.105, R6708P08)

]display environment

System temperature information (degree centigrade):
----------------------------------------------------------------------
Slot Sensor Temperature Lower Warning Alarm Shutdown
0 hotspot 1 41 0 80 97 NA
1 hotspot 1 37 0 80 97 NA
2 hotspot 1 40 0 80 97 NA
3 hotspot 1 38 0 80 97 NA
4 hotspot 1 39 0 80 97 NA
5 hotspot 1 32 0 80 97 NA
7 hotspot 1 37 0 80 97 NA
8 hotspot 1 38 0 80 97 NA
9 hotspot 1 37 0 80 97 NA
10 hotspot 1 36 0 80 97 NA
11 hotspot 1 37 0 80 97 NA
12 hotspot 1 30 0 80 97 NA

So thats a bit boring - threshold-wise

So if any sensors go beyond the warning-threshold, it will probably mean that the "time till failure" will be less, and if you go beyond alarm the component might break soon. Keep environment temperatures in the 20ies I would recommend.

Regards.