[AusNOG] Cooling Pads for Juniper SRX?

Tue Dec 2 15:34:20 EST 2014

On the topic of the cooling pads, the laptop ones I have seen are either using
1. Just some fans in a molded base, usually cheap USB ones that barely help (the stand does more than the fans generally)
2. A Peltier cooler

The Peltiers are pretty power hungry for the minimal “cooling” they provide, they just move the heat to the other side anyway which is probably not ideal in a rack or anywhere you likely have these.

There is no way to just increase the air flow through the devices using additional rack fans etc? If the ambient is only getting to 32-36 simply increasing air flow through / around them should be enough to drop it under the shut off temperature, though it is obviously still going to have an impact on the lifespan of them.

Somebody else may have a better suggestion but that would be a decent basic starting point…

Thanks,
Ayden Beeson

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Skeeve Stevens
Sent: Tuesday, 2 December 2014 3:27 PM
To: ausnog at ausnog.net
Subject: [AusNOG] Cooling Pads for Juniper SRX?

Hi all,

I have an issue with some Juniper SRX100's overheating.  I've seen them get hot before, especially placed on something similar (i.e. another SRX100)... and given warnings of overheating, but never shut down.... but this situation is different.

These SRX100's are shutting down as they are reaching a core temperature of 70c as they are located in racks that are outside in the sun and on particularly hot days - around 32c-36c they overheat and turn themselves off.

Some might say this is understandable... and I sort of agree.  Although their operating system says they are good to 40c, that doesn't really seem to be the case.  The SRX110's are a little more tolerant given they are bigger units - but have the same operating environmentals (along with the EX2200-C).  But at the moment I have the SRX100's and would prefer not to swap them out as it will cost significantly.

Then one of my staff had (what I think) a good idea today... to use cooling pads... maybe like the ones you use for laptops or something.

So I am wondering if anyone has been some solid - not $20 junk or such.. but something that runs off mains, and works well 24x7x365 - maybe even something that only kicks in once a certain temperature has been reached.

I thought if anywhere, a couple of these mailing lists might have had some experience with these kinds of things - especially for those who have built regional pops and have had to cool some equipment.

Thanks all!

...Skeeve

Skeeve Stevens - eintellego Networks Pty Ltd
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