The issue is the heat dissipation… so the software is trying to prevent you from damaging the hardware.

Hello.

Will this work for RS modules, using a non CMHS fan tray and invoking these commands?

I am having the same problem.

thanks for confirmation

Hi Pali,

You should be fine with the 8005PS… if you had 8004 or 8001 then you might need to upgrade the power supplies.

Cheers!

Does this high speed fan modules requires special power specification.
Currently ,am having two 8005 1140/1372W 120/240V AC-DC Power Supply in 8010 chassi.

Thanks

You’ll see the option “highspeed” in the output of a ‘show tech’;

Fan Info :

        Fan#1: up, type: highSpeed, air temp: 31 C
        Fan#2: up, type: highSpeed, air temp: 28 C

As opposed to ‘

Fan Info :

        Fan#1: up, type: regularSpeed, air temp: 32 C
        Fan#2: up, type: regularSpeed, air temp: 33 C

I had a similar problem running 8600’s in a concrete 8’x10′ room at the 2010 Winter Olympics. The building was brand new, and they had yet to get HVAC into that room. The solution was to help the fans out by creating a vacuum. Air flow on the 8010/06/03 chassis is IN on the left, Out on the right. I took a standard BOX FAN from Canadian Tire, used the cardboard box that it came in to create a venturi. Using duct tape on the RIGHT (exhaust) side of the switch the Box Fan SUCKED the air from the the switch. This meant that the internal fan trays did not have to work as hard to suck air through the switch, thus increasing the CFM through the chassis. I have also used this trick when I have multiple fan failures in a fan tray, buying time until I get a replacement fan. The chassis has thermistors that will shut down the system if it gets too hot. This trick can buy you a lot of time.

I have run the High Speed fans using 8001PS.

After reboot, if the slot still has not booted then:
(config)# int slot 1 (replace “1” with the appropriate slot #)
(config-if)# no shutdown
(config-if)# exit

I don’t believe there is any requirement for an 8004PS or 8005PS, other than you need some extra KW to drive the high-speed fans.

I believe the 8010CMHS is fine to use in any chassis given you have the extra KW power available.

Cheers!

My chassis are type a8010 rev A and another one is a8010 rev 06.

Just checked and the chassis temp shows as 41C. Probably because it is cooler outside now. It was a real furnace in the summer – ~50C.

The B&G folks did a great job sealing the room up for the Automatic Fire Suppression System!

I hear you Tom… We should probably run a contest – how hot is your hottest closet?

I have several ERS8600s that run at 42C all day and night long. I will admit that I’ve seen a pair of my core ERS 8600 reach 52C, I was sweating on that night and thought I was going to have a disaster on my hands but those switches just kept on running.

Cheers!

You’re preaching to the choir. I asked for the closet to be cooled but it will have to wait until next year.

But getting more air moving, even warm, should help preventing thermal pockets build up in the chassis.

We’ll see once I check the temps on current fan tray vs. high speed fan tray.

Thanks for the comment Richard!

I believe they would physically function although they might be mis-reported by the switch software.

If your closet is hot, blowing more hot air won’t help the situation – you need to vent the hot air out of the closet and introduce cold air.

Thanks for the comment!

Would the high speed fan trays even function in pre 5.x.x.x software?

It’s was a classic “DoH!” moment for me… :)

Thanks for the comment!