In fact, some switches have a firmware toggle to reverse the fan direction.
On Thu, Oct 20, 2011 at 3:00 PM, Brian Mathis < [email protected]> wrote: > On Thu, Oct 20, 2011 at 2:26 PM, Luke S. Crawford <[email protected]> wrote: > > > > I've been mounting switches backwards forever; I mean, the ports are on > > the back of the servers, right? it only makes sense. Now, normally, > > I put it at the top of the rack and it works fine; excess heat gets > > sucked out through the fan at the top of the rack. > > > > Well, in my most recent racks, I decided to be clever and mount it in the > > middle. Less cable travel for everyone, right? > > > > The idea turned out less brilliant than planned. I mounted a server > > above it that was already, ah, iffy heat wise, and as soon as it was > > loaded, it crashed, I believe due to thermal stress. > > > > So my thought is to just mount some powerful fans opposite the switch[1], > > pushing the hot air out the front of the rack. I mean, it would warm > > the intake of the servers above, but most of my servers are not thermally > > iffy, and the data center is reliably cold, so that seems to be less of > > an evil than dumping all the heat into the server immediately above > > through the bottom of the case. (though, I suppose, that is also an > option; > > I have some massively overcooled 3u chassis that could take that heat > > and a lot more and dissipate it before anything unpleasant happened. > > Heck, I should put the 'thermally iffy' server in a new case anyhow, > > and that wind tunnel sounds like just the thing;) > > > > [1]perhaps something like this: > > http://www.amazon.com/Tripp-Lite-SmartRack-Rack-fan/dp/B001DW8J5M > > > I wouldn't consider this backward, but the correct way. If the fans > in the switch are blowing the wrong way, that's a design mistake made > by whoever built the switch. > > The problem here is the server that's crashing. If it crashed > immediately then it was already far too close to thermal failure and > you need to address that. I'd remove the CPU coolers, clean them off, > then remount with some fresh thermal compound. Clean out any dust in > the fans, make sure all fans are working, etc... > > > -☙ Brian Mathis ❧- > _______________________________________________ > Tech mailing list > [email protected] > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ > -- LITTLE GIRL: But which cookie will you eat FIRST? COOKIE MONSTER: Me think you have misconception of cookie-eating process.
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