nanog mailing list archives
Re: Routers in Data Centers
From: Joel Jaeggli <joelja () bogus com>
Date: Sun, 26 Sep 2010 11:09:24 -0700
Joel's widget number 2 On Sep 26, 2010, at 10:47, Chris Adams <cmadams () hiwaay net> wrote:
Once upon a time, Joel Jaeggli <joelja () bogus com> said:On Sep 26, 2010, at 8:26, Chris Adams <cmadams () hiwaay net> wrote:There are servers and storage arrays that have a front that is nothing but hot-swap hard drive bays (plugged into backplanes), and they've been doing front-to-back cooling since day one. Maybe the router vendors need to buy a Dell, open the case, and take a look.The backplane for a sata disk array is 8 wires per drive plus a common power bus.Server vendors managed cooling just fine for years with 80 pin SCA connectors. Hard drives are also harder to cool, as they are a solid block, filling the space, unlike a card of chips.
It's the same 80 wires on every single drive in the string. There are fewer conductors embedded in 12 drive sca backplane as there are in a 12 drive sata backplane, in both cases they are generally two layer pcbs. Compared to what 10+ layer pcbs that are a approaching 1/4" thick on the router. Hard drives are 6-12w each, a processor complex that's north of 200w per card is a rather different cooling exercise.
I'm not saying the problems are the same, but I am saying that a backplane making cooling "hard" is not a good excuse, especially when the small empty chassis costs $10K+. -- Chris Adams <cmadams () hiwaay net> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble.
Current thread:
- Re: Routers in Data Centers, (continued)
- Re: Routers in Data Centers James P. Ashton (Sep 24)
- Re: Routers in Data Centers Marshall Eubanks (Sep 24)
- Re: Routers in Data Centers Warren Kumari (Sep 24)
- Re: Routers in Data Centers bmanning (Sep 24)
- RE: Routers in Data Centers Alex Rubenstein (Sep 24)
- Re: Routers in Data Centers Seth Mattinen (Sep 25)
- Re: Routers in Data Centers Joel Jaeggli (Sep 25)
- Re: Routers in Data Centers Chris Adams (Sep 26)
- Re: Routers in Data Centers Joel Jaeggli (Sep 26)
- Re: Routers in Data Centers Chris Adams (Sep 26)
- Re: Routers in Data Centers Joel Jaeggli (Sep 26)
- Re: Routers in Data Centers Seth Mattinen (Sep 26)
- RE: Routers in Data Centers Alex Rubenstein (Sep 26)
- Re: Routers in Data Centers Richard A Steenbergen (Sep 26)
- Re: Routers in Data Centers Christian Martin (Sep 26)
- RE: Routers in Data Centers Simon Lyall (Sep 26)
- Re: Routers in Data Centers Steven King (Sep 25)
- Re: Routers in Data Centers Richard A Steenbergen (Sep 25)
- Re: Routers in Data Centers Steven King (Sep 25)