Slashdot Mirror
Homebrew Rackmount Watercooling
Airspirit writes "For those of you who believe that bigger is always better and have multiple computers in your house,
this system may be a way to keep them all cool and organized. As an added bonus, it will heat a medium sized apartment all by itself!
This article at Pro/Cooling gives a step by step walkthrough describing the evolution of this five gallon monstrosity. Not only does this cover the construction of the cooling system, but the drawbacks such as algae prevention and maintenance as well."
What?
Oh, Mountain Dew...
Darn!
You don't need a rackmount water cooler to heat a medium sized apartment, one AMD processor will do quite nicely ;)
And for those who think I'm joking, I haven't run my heater in my apartment since I bought my AMD last winter.
std::disclaimer<std::legalese> sig=new std::disclaimer; sig->dump(); delete sig;
You know, for when you don't want your computers heating your house, one way or the other.
... hate to see the AC bill in the summer though. Especially here where there really is no spring, it just goes directly to hot and humid.
I'd get one if for nothing else but the coolness of it.
Technology, the cause of and solution to all of life's problems.
Please don't even remind me about homebrew rackmount watercooling... Just remember to always check if the water is not leaking anywhere before you turn it on together with $15000 equipment. This is a lesson I learned the hard way...
Karma: Positive (probably because of superiour intellect)
You don't need a rackmount water cooler to heat a medium sized apartment, one AMD processor will do quite nicely ;)
...that he lives in southern Florida too.
And for those who think I'm joking, I haven't run my heater in my apartment since I bought my AMD last winter.
this makes you wonder how long it will be before information surpasses transportation as the largest consumer of energy on the planet
MP3 Search Engine
Ok, the web site is down. Bring on the traditional
.
jokes! It has to do with water cooled systems. So,
let's see...
1. The water must be boiling! Har har har!
2. Time for some more coolant! Har har har!
3. The radiator must have blown a gasket! Har har har!
4. Imagine a beowulf cluster of . .
5. They need to switch to a better coolant than water! har har har!
Oy, this is sooooo predictable. Mod this down because I
close with a traditional "slashdot sucks" comment.
I first heard about this on an episode of the screensavers a couple years ago. Yoshi, the king of all Case Mods, built a case out of plexi and attached a resevoir which was filled with dry ice and an chemical of some sort from 3M. For cooling a PC with Liquid, that seems to be a much more viable, albeit expensive option than this. I don't have a link to Yoshi's mod, but a search on TechTV would turn one up.
I have no regrets, this is the only path.
My whole life has been "UNLIMITED BLADE WORKS"
*I can say this, for I too am in desperate need of a shower. :P
I'm looking at the green water on the diagram and I see the blackish smudge and I'm wondering if that's a plecostomos???
Now I suppose someone's gotta code Perl::FishFeed to make sure the algae prevention measures are in place....
-B
Google Cache. Of course, no pictures....
Algae prevention is a drawback? Remind me to never eat from the submitter's refridgerator.
Trolling is a art,
" Being that I'm in physics and I barely need a home computer, I'm always mystified by people who have things like rack-mount systems in their homes. I never manage to understand why you'd need that sort of thing."
;-)
Oh, music, movies, games, web, chat, photos... you know - fun!
You, dear sir, are trolling. Plenty of people need lots of power in house. Some like to do 3D artwork which requires a lot of power for rendering. Others yet work at home, serving their websites and the such, and want to keep their computers managable and neatly tucked away somewhere so that their spouce doesn't lash them for all the cables running everywhere. I'de have a rackmount system myself if I could afford such a thing.
;).
I just feel sorry for the poor guy. The heat must get unbearable when those things start churning. Maybe he should use the water cooling system to cool himself off instead
"Victory means exit strategy, and it's important for the President to explain to us what the exit strategy is." G.W.Bush
Because desktops take up loads of space... And when you are developing for multiple platforms, rendering 3d or hardware testing you NEED access to multiple systems.
Why prevent the growth of algae? With algae, this object fully supports your personal biosphere.
7:17 a.m. - article posted on Slashdot.
7:19 a.m. - water cooling system begins to be put to the test
7:27 a.m. - Slashdeath results in a high pitched whistle caused by steam venting from piping.
7:27:05 a.m. - Apartment dweller wakes.
Rube Goldberg would be proud.
__ Someday, but not this morning, I'll finally learn to use the preview button.
wouldn't it be nice if Slashdot had a temporary copy /cached web sites they linked to instead of the original? I'm sure this would greatly reduce sladotting problems.
Argh I saw homebrew and excitedly clicked in because I thought it was a way to keep the PC cool while brewing your own beer. Boy was I surprised.
before information surpasses transportation as the largest consumer of energy on the planet
No, see, they'll be combined. We'll leave our bodies, transform ourselves into pure energy, and travel among the wires à la Matrix or Serial Experiments Lain.
And instead of traffic jams, we'll have DoS jams.
The coolest voice ever.
No, that would make too much sense.
Ps. wouldn't it be nice if slashdot didn't make you wait 20 seconds to reply.
It would be more than nice. With the current setup (no help from Slashdot) we show our appreciation for the pointed-to websites by crashing their servers, getting their sites shut down, or massively enlarging the owner's bill for bandwidth. In other words, currently we do to the people we like the same as we do to people we don't like. Its a shame that the majority of Slashdoters, as well as Slashdot themselves, can't seem to figure this out.
I want a new quote. One that won't spill. One that don't cost too much. Or come in a pill.
CPU heat exchange engine providing enough energy to power your PC.
Behold the perpetual PC!
No, no, no, Slashdot _can't_ do this, for one because it would simply be illegal to copy random sites like that, secondly because it might imply that Slashdot is somehow responsible for a 'quality of service' and if their copy does not work, could be sued, and lastly because if this was done, we couldn't enjoy ourselves flaming people like yourself who think that this obvious, useful, and practical solution to a real and annoying problem is worthwhile. Anyhow, the principle of caching web sites has probably been patented by Google. /irony
Sig for sale or rent. One previous user. Inquire within.
Apparently all 5 gallons of water evaporated due to the Slashdot effect.
This
You are bound to have the following happen.
1.) Be marked as overrated, troll, or offtopic to a -1 karma
2.) If someone other than me does reply they will either mention the FAQ, or provide you with a link.
3.) Someone will actually "tell" you what the FAQ Says
Slashdot should cache pages to prevent the Slashdot Effect!
Sure, it's a great idea, but it has a lot of implications. For example, commercial sites rely on their banner ads to generate revenue. If I cache one of their pages, this will mess with their statistics, and mess with their banner ads. In other words, this will piss them off.
Of course, most of the time, the commercial sites that actually have income from banner ads easily withstand the Slashdot Effect. So perhaps we could draw the line at sites that don't have ads. They are, after all, much more likely to buckle under the pressure of all those unexpected hits. But what happens if I cache the site, and they update themselves? Once again, I'm transmitting data that I shouldn't be, only this time my cache is out of date!
I could try asking permission, but do you want to wait 6 hours for a cool breaking story while we wait for permission to link someone?
So the quick answer is: "Sure, caching would be neat." It would make things a lot easier when servers go down, but it's a complicated issue that would need to be thought through in great detail before being implemented.
Answered by: CmdrTaco Last Modified: 6/14/00
4.) Someone might actually answer your question ...
Basically it all boils down to slashdot doesn't care if it causes an effect similar to that of a denial of service attack. They feel that since they are linking to a public webserver that they are doing no more harm than say a search engine. The caching of a webpage would mean that they would have to invest time and technology into a caching system (which they have neither the programming experience or capabilities) and not to mention money in the hardware (gotta store the things).
It's a weird situation, slashdot publishes a story acknowledging That there are smaller servers that never intend to have the amount of traffic that they get. Just so happens that no one has actually sued slashdot yet, which happens to be the only thing the editors fear more than being fired.
So will you see a change, no, and why? Because of the above mentioned reasons and because those responsible for building slashdot are lazy and not innovative. You want innovation and caching then I would highly reccomend google. Just post in the subject line of most slashdot stories, since most of them are usually a week old, they've already been cached.
Ignore the "p2p is theft" trolls, they're just uninformed
Every time I see a slashdot headline with the word "homebrew" in it I think that at last there's an article about beer, but no :-(
Stick Men
I have 5 machines in my home office, it seems like overkill but I use these to replicate/test deployment environments. I deal with multi-tiered systems for a living and a single machine simply isn't close enough to the "real world" for developing/testing. That said, I'm not crazy about my rack being 6 feet aways from my desk since a) it's noisy and b) it generates heat, but longer monitor cables create pixel bleeding on my LCD so I tolerate it, well, at least until somebody comes out with a wireless monitor to go along with my wireless keyboard and mouse.
Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws-Plato
It must be time to go to bed. I just worked all night and at first I read "Hebrew rackmount cooling." I was so confused.
There appears to be nothing 'superiour' about your spelling however.
Warm water breeds all sorts of wildlife. Use waterbed disinfectant in there (or a small amount of bleach) to keep things clean.
The trick then is that the water containment needs to be waterproof sealed, otherwise as the water evaporates, you'll have chemicals floating around in the air of your house.
Karma: Chameleon (mostly due to the fact that you come and go).
This is actually my system. I don't think Joe, the owner of Pro/Cooling (not hosted on a watercooled system, btw), had any warning that his server was about to be slashdotted. I suppose spraying your systems down with a fire extinguisher is not the best way to spend a Monday morning, but who am I to judge?
... oddly enough, she uses Windows for the "heavy lifting" and Linux because she loves the games!).
And he always said he wanted more traffic, hehe.
Anyway, the reason I have so many machines is that I do professional web design and database programming, an obscene amount of gaming, and host multiple network services. From top to bottom you have:
PC 1: Gaming, development (WinXP/Mandrake 9.1)
PC 2: Wife's office computer (WinXP/Mandrake 9.1)
PC 3: Linux network server
I host a mini-ISP out of my house for the neighborhood, so the Linux server helps keep bandwidth consumption down as well as providing other services my customers demand.
I have a KVM that allows me to swap between PCs 1 and 3, and she has her own equipment for her PC (I just leave it alone
Anyway, I better go run and hide before Joe hunts me down!
Airspirit
You steaming piles of cat shit!!! Motherfucker has a fucking point....don't cry like little bitches and mod him down....
fuck, i hope the meta-mods strap you over a 55gal barrel and sodomize your anuses with Garden Weasels (tm).
100% Offtopic
Cute ...
Ignore the "p2p is theft" trolls, they're just uninformed
We're sooo happy to see you!
Yoshi DeHerrera of TechTV has an article about how to use HFE from 3M to build a submerged cooling system for a computer. Find it here.
Check out the Google Cache of the page
Easy, one is a firewall for your internal LAN, one is a shell/web/irc/ftp/DNS/mail server for your friends and family, one is the backup mail and DNS server, one is a file server on your internal network for Samba/NFS sharing and general purpose Linux stuff, one is your desktop (not in the rack usually), one is your laptop, one is your wife's laptop, one is an old Sparc 20 you had lying around, one is an old AlphaStation 200 you had lying around, one is a P90 running Win95 used for nothing really, one is a PPro-150 box running Win98, one is a dual PPro-200 box running Linux... err, you get the idea. Add in networked printers and your wireless access point and you have a rack full of shit.
I almost spat beer on my monitor there :D
.
Obviously NOT Pro Hosting!
...so that their spouce doesn't lash them for all the cables running everywhere...
That is the reason why I don't have a rackmount system.
Wife: (dressed in red and black leather with 12" heels) Clean up this electronic mess CRACK!
Me: (in a submisive, but slightly excited tone of voice) Yes mistress, thank you mistress, may I have another?
..how this works." "The white stuff requires two types of glue to form a seal. First you apply primer, rubbing the brush around until the PVC starts dissolving and looks milky (do this on both parts on all areas that will be connected), and then you apply PVC glue until the primer and glue are completely mixed (on both parts).." You don't /mix/ the primer and glue! The primer is a alchohol-based cleaning compound! If you don't wait until it dries, the joint won't bond.
".. and then you slide the parts together and hold on for dear life."
Hell yes! He mixed the glue and primer: "Pal, you're going to be holding that for a loooong time.."
Oh, and I /do/ work with Sch 40; think 200 psi pressure lines. Don't mix the primer, man. It ain't purty.
"The most looniest, zaniest, spontaneous, sporadic Impulsive thinker, compulsive drinker, addict"
We always hear people complain about the slashdot effect and I was earnestly asking for clarification which you provided and am happy with.
Contrarily to some people that just mod me down and keep me in the dark you actually did something constructive by explaining things to me. Thank you.
I've got conduit running from the second floor computer room in my house into both the attic and crawlspace. I'm thinking of doing something like this, and running the heat exchanger portion under the house, to take advantage of the cool climate under there, and provide and emergency outlet for leaks. I'm thinking of using copper tubing on the two heat-exchange ends, with polymer tubing in between (in the conduit). I'm wondering what the flow rate would need to be, and how big the tubing would need to be to support that flow rate. Not being a fluid-flow or heating/cooling engineer of any type, I'm posting this question. :) It would be convenient to be able to use ordinary fish-tank equipment. The height of the water loop will play into that -- it has to be pumped up and down about 20 feet.
Napster-to-go says "Fill and refill your compatible MP3 player", which is a lie. It's not MP3. It's WMA with DRM.
"My computer has an algae problem."
HD: "Well, is it blue-green algae, or just regular green algae?
"How do I tell?"
HD: "Oh for pity sake! Go to START, Programs, Algae Management."
"Ummm.. Maybe I should just shut down and go spend some time outdoors?"
Operator, give me the number for 911!
"He is wise, but inexperienced. His pattern indicates two-dimensional thinking."
-Mr. Spock
I invested in rack mount cases and an enclosure a few years back, and haven't regretted it. If you have little floorspace and need several machines, racks can't be beat. They use airspace that is otherwise wasted. Mine uses a closet.
But God Allmighty, it's not cheap.
"This is the greatest country on Earth!
We've got a whole system set up just to guarantee that people like you don't become president!" -- Abe Simpson knows where it's at!
That is the first time I have _ever_ been moderated down. Can someone explain why it's offtopic?
Other posts, same topic, moderated up...
Contrarily to some people that just mod me down and keep me in the dark you actually did something constructive by explaining things to me. Thank you.
I stopped caring about karma and moderation a long time ago, I post how I feel and I figured you asked a decent question and deserved a decent answer.
Ignore the "p2p is theft" trolls, they're just uninformed
The exception is if you use a large ventilation fan to blow into an open case. (been there done that.)
I DO use my computer as a whitenoise generator at night though. I've seen people charge $100-200 for whitenoise generators, when a simple program on a PC can do the trick. Under Linux, do a search for "whitenoise". Nice small program.
Under Windows, so far the best solution I have come up with is to use Octave to generate a white noise (actually, "pink" noise, i.e. white noise that has been lowpass filtered) waveform, save it to .wav, and set Winamp to play it in an infinite loop.
Octave code to do this:
This creates white noise at a high level up to abour 2.2 kHz, and then additional noise at a much lower volume up to 4.4 kHz or so. You can adjust the cutoff frequencies (Second arguments to both fir1() functions and the ratios of volumes to your preference.Note that I generate a noise array and then dupe it three times before filtering it and then truncating it again. This prevents discontinuities in the final waveform that would present audible clicks/pops after every loop. (Similar theory to some of the tricks used to make seamless tiles in The GIMP.)
retrorocket.o not found, launch anyway?
Thank God Algore took the initiative in inventing the internet!
Back when I was a kid, my fishtank had a nasty algae problem.
So my parents bought a pleco. Tiny little thing, maybe 1-2 inches long. We called it "Lucky" due to the abundance of food in the tank.
Lucky lived for 12 years, far longer than any other fish we've ever had. And man do those things GROW. By the time it died it was nearly a foot long and thicker than its original length. It probably would've been twice the size if we'd had a larger tank.
retrorocket.o not found, launch anyway?
It's a weird situation, slashdot publishes a story acknowledging That there are smaller servers [slashdot.org] that never intend to have the amount of traffic that they get. Just so happens that no one has actually sued slashdot yet, which happens to be the only thing the editors fear more than being fired. "
And they are wrong. Slashdot is different than and indexing service in that it produces a large number of hits in a short period of time. Google pushes traffic to you fairly evenly distributed over time.
This kind of attitude is just more proof that the "editurs" are a bunch of amatures that just happened to luck into tapping into vibrant community.
key word being "shit". you need to invest in some new hardware bro.
As an added bonus, it will heat a medium sized apartment all by itself!
It's not a design flaw, it's a feature!
I can hear it now.
"Dad. It's getting cold in here. Can I run something computationally expensive?"
What about using antifreeze? would that work?
Easy, one is a firewall for your internal LAN, one is a shell/web/irc/ftp/DNS/mail server for your friends and family, one is the backup mail and DNS server, one is a file server on your internal network for Samba/NFS sharing and general purpose Linux stuff, one is your desktop (not in the rack usually), one is your laptop, one is your wife's laptop, one is an old Sparc 20 you had lying around, one is an old AlphaStation 200 you had lying around, one is a P90 running Win95 used for nothing really, one is a PPro-150 box running Win98, one is a dual PPro-200 box running Linux... err, you get the idea. Add in networked printers and your wireless access point and you have a rack full of shit.
Damn! You've almost perfectly described my home network!
Ender
Nothing to see here
Interesting as there are a few of us out there that use geothermal cooling for our households. Mine is an example. I have an open-loop geothermal system that pumps water out of my well and discharges it elsewhere on my property. It works very well in both the summer and winter to keep my house in my comfort zone. Now all I need to do is redirect some of that cooling power to my equipment in the basement.
Viewsonic Airpanel
a ne lv150.htm
http://www.viewsonic.com/products/airpanel_airp
It must've overheated.
What benefit do you gain from having wireless input devices when you are cable-tied to your rack?
But I've got about 100 8 foot racks in the back office that I've been trying to get rid of, cheap. :)
(relay style racks)
j
-- There is no sig line, only Zuul.
Yep. I've got a water cooled machine sitting right next to me. I don't even have it cooled as a matter of overclocking (although that is a nice little bennie) I have it WC'd because I can't stand fan noise.
01101001 01100001 01101101 01101110 01101111 01110100 01100001 01101100 01100001 01110111 01111001 01100101 01110010
I set up my own very first rack (21U of space) in the equipment closet in my house (custom built so it'd have an equipment closet). The rack houses an Ethernet switch, patch panel, UPS, two 1U servers, and a 2U RAID server. (Yes, I need this much equipment.)
I originally placed all the equipment right on top of each other, leaving 12U open. What a mistake! It was up about 30 minutes before the RAID array complained of multiple drive failures and one of the other servers was hung hard. The entire rack itself was painfully hot to the touch.
Leaving 1U of space between the equipment was all it took to solve the problem. Convection---you gotta love it.
I have an Athlon XP 2000 and a Pentium 3/500 in my room.
This last winter, the heat in my old apartment died 10 times between January 1st and April 30th. Most notable was a week where the temperature outside never got above 15 Farenheit. I never noticed in the night because my room never went below 65, even with failed heat.
My poor roommate was not so lucky, not only did he not have an Athlon room heater, the air intake from outside was in his closet, and the seals broke. He had a 1.5'x1.5' hole to the outside.
"The heat must get unbearable when those things start churning. Maybe he should use the water cooling system to cool himself off instead"
Uh, isn't the point of water-cooling / air conditioning etc. that you put the radiators outside? Perhaps the next project will involve a steam-powered turbine to provide combined heat and power to the neighbour's home.
10% discount for hosting your server-farm near to a power-station, water-cooling provided for free...
Their site was working enough that the page loaded from the Google cache would, after a (long) delay, pull in the images. I saved all three pages with Mozilla and zipped them up. Enjoy.
20 January 2017: the End of an Error.
Yeah, I started with a relay rack, and the discovered why it was so cheap :) Damn thing did nothing for noise control or air circulation, and cable management sucked hard.
So, I picked up a fully-enclosed rack at an auction, and haven't looked back.
The "expensive" part I was referring to was the rack-cases themselves. I know you can just use a shelf, but sliding-drawer-style rails are soooo much nicer.
This is how I would do it. During the period where only subscribers can see the story, Slashdot would quickly build a cache of the site.
Then, every minute, it would send a small HTTP request (like for robots.txt) and keep track of the response time. Maybe it could even generate a small postage-stamp sized log-scale graph of the response time as a PNG and insert or link to it from the front page, so you'd know how the site is holding up before clicking on the links.
Once the response time has increased by a certain factor, the bot assumes the site has crashed under load. It then automagically posts a comment to the story with the subject "uhhh... it seems to be slashdotted" and then spits the site (stripped of HTML) into the comment body. This would save karma whores a lot of time.
> currently we do to the people we like the same as we do to people we don't like
I guess DRTFA should be a new common (polite) phrase...
(actually spare bedroom).
From 5 machines (firewall/router, mail/directory, database/appserver for development, file/print server for music and crap and one more box I was not sure what it was running), it went to one giant antec case with lots of drives and dual PIII 450 and Linksys access point/router.
Now I can actually enter the room and spend time in it and my electricity bill went down by about $20 a month.
I use 8 parts distilled water, 3 parts "G12" (pink colored) VW/Audi/Mercedes engine coolant* and 1 part denatured alcohol.
I've been algae and critter free** for over year now with no maintenance required at all.
* This is probably the best coolant you can buy. It is free of all corrosive chemicals that "regular" coolant has, and it prevents corrosion due to dissimilar metals better than other coolants. ** My PC watercooling rig is pristine and clear and free of bacteria and algae and small animals. If it weren't for the toxic coolant and alcohol, I could drink it.
I'd rather be a conservative nutjob than a liberal with no nuts and no job.
This is an excellent idea. I think it could be implemented like a caching proxy for all URLs referenced through slashdot.
there are 3 kinds of people:
* those who can count
* those who can't
Get thee to the swimming pool section of your local Lawn & Garden. There you will find gallon bottles of 40% Algacide, about $12 US. Aqua Chem is the brand 'round here.
Quatanary Ammonium - pretty useful stuff.
Treats 200,000 gallons. A little dab will do 'ya. Safe and effective usage requires substantial dilution. Not only good for you swimming pools and CPU cooling loops either...
1) Use the same stuff in your Waterbed. A few oz, every year or two.
2) If you're really cheap, you can refill those hang on the back of the tank toilet cleaner bottles. No blueness, tho. Calculate dilution v. flush volume and dispenser's lifecycle. Add cheap laundry blue if you want blueness.
3) It is also used in those disposable "sanitary' wipe dispensers, marketed at the kitchen and bath. I forget the brands, little plastic bottle from which you pull wet naps out of the top. Just use a regular rag and dilute in a squirty bottle.
4) It is also used as a sanitizer dip/wash in the food trade. The machine the spit out that frosty Milk 'A Like(tm) shake you're sucking down probably soaked in the stuff just last night.
What is needed is probably something more effective, an inert substance that has a extremely high specific heat. Liquid sodium in a high pressure system may be a good choice to convey the heat, as it has an extremely high specific heat, allowing for much more heat to be conveyed with less substance, though the results may be disasterous if the system loses containment. I have also heard about a really expensive inert liquid from 3M that electronics could be submerged in without any negative effects, though I'm not sure of its specific heat values.
Hey, wait a moment.
You make noise?
I mean, you MAKE noise so that you can sleep?
Hell, I turn off my Apple/PC to have NO noise.
And I live in the middle of town.br.
You can go with a cooling tower construction. The inner is your traditional rack. The outer is a metal plexiglass construction with a front door, and the top and bottom is open. Top and bottom fans (big and slow) optional. Also cuts down on noise[1]. For additional fun, run big diameter plastic pipe to the outdoors (don't forget to screen properly), intake and exhaust. There can be any number of variations. Cooling radiator at the bottom. For the more industrious, one can even cludge something together from say open wire metal shelving. mount some integrated mobo's vertically. Modified power supplies. HDDs are a dicier problem. SATA can help here, or try NAS.
[1] Also makes it easier to control other parameters like humidity for example.
> Oh, music, movies, games, web, chat, photos... you know - fun! ;-)
Man, you've forgotten the pr0n!!!
Try paraffin wax (Guess what's used in lava lamps?). Or a light viscosity oil. Hey! It works for your transmission.
Admittedly, not much, one less set of cables running across my desktop. When I purchased the mouse and keyboard (Logitech combo) I *had* expected to run a much longer monitor cable and move my rack into a closet about 10 feet away, but the pixel-bleed nixed that idea.
Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws-Plato
Our office has desks with little computer cubbyholes in them. One day I decided to burn a big stack of CDs to send off to customers (we make & sell small volumes of reference CDs). After about 4 disks, my machine (AMD Athlon XP 1800+, 52x CDR) kernel panicked. I burned my hand on the top of the case. I took the machine out of the cubbyhole and there hasn't been a problem since, even when burning many CDs in a row.
You're "in physics"? I'm "in physics" and I can picture lots of reasons (simulations, data analysis) where I could justify a cluster. Well, OK my wife won't let me...
But, more to the point: put in fast internet access. Add a hardware firewall. Run that into a Switch / Router. Have a machine for development. A test environment (a separate machine so we don't hose the development machine). And any number of machines for cross compiles. Oh, and we can't forget the machine for my wife to surf on. Add a UPS big enough to support all of the above.
Now we're talking about a professional set-up that will easily take up a full rack.
That's kinda cool but it's XP only and it's too small. I use 17" screens now and I'm considering 21" screens to get some more coding space. Also, since it's not wireless in the sense of "works just like a VGA monitor" it's not quite the solution I'm looking for.
Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws-Plato
Funny, my house is already full of chemicals floating around. Nitrogen, oxygen, etc.
Surprisingly, I am also made of chemicals.
Some forms of noise are more pleasing to the human ear than others, and monotonous noises (like fans) can actually be soothing. I actually CAN'T sleep without some background noise such as a fan (or my PC's whitenoise generator) running.
:)
CPU fans are the exception, as these emit rather high-frequency narrowband noise. I'm talking about larger fans of the 2-foot+ variety. Hard drives are also too high pitched, plus the heads make all sorts of nice clicking sounds.
The output of that program is broadband noise at low frequencies that sounds rather similar to a waterfall. It's a soothing sound, but more importantly, it masks out spurious background noises (birds chirping, cars passing by, etc.) all of which tend to keep you awake/wake you up. The code I put in to add the small amount of higher frequency noise makes the output LESS comfortable to hear, but helps because it assists in masking out some noises in the 2.2-4.4 kHz spectrum.
Use of white noise to mask other noises is an established procedure in many office environments to mask out the sounds of things such as keys clicking. (In these cases the amplitude is VERY low so as to be not consciously noticeable.)
Someone emailed me about some other aspects of noise, so I might be able to improve the program tonight.
retrorocket.o not found, launch anyway?
The other cool advatage about a /. caching system is that they could add a little bit to your karma for actualy loading the links in the article.
Apocalypse Cancelled, Sorry, No Ticket Refunds
For example, commercial sites rely on their banner ads to generate revenue.
translation: We're to lazy to figure out how to write a caching script intelegent enough to realize that if it's caching example.com, the links to doubleclick.com are ad banners and should be drawn off the URL listed instead of the translated cache URL.
Apocalypse Cancelled, Sorry, No Ticket Refunds
Jewish wet t-shirt contests?
Get rid of everything Micro and Soft: Buy Viagra and/or Linux
Liquid sodium makes a great reactor-vesel coolant. It has a low viscosity, and a high specific heat. Unfortunately it's melting point is 97.72 C. You'll notice that this is about 27 C above the maximum operating temperature of almost all consumer electronics.
Somebody else suggested parafin wax. I'm not sure, but I think they were also pointing out this flaw. Strangely, I had thought of experimenting with parafin to provide cooling... but not for a running system. I thought of useing a sealed case with hollow walls filled with solid parafin as a container for backup tapes inside a fireproof safe. Hopefully the melting parafin would absorb some of the heat, protecting the tapes longer. As long as it doesn't leak and catch on fire.
Ethylene glycol also is not so good... It's most efficient at about 200 C, which is what makes it such a good coolant for car engines.
Methanol works great at the temperatures you want to strive for in computer cooling. unfortunately, it's corosive, volatile, odourless, and extremely toxic.
See this article for more.
At first I thought your comment was an obscure Perl module.
Vino, gyno, and techno -Bruce Sterling
First I've heard that one. You must spec "Avion, or better".
Really, tho, the trouble with water is twofold.
1) Bugs. Antifreeze will take care of that. But, you can still use 60% fancy water.
2) Conductivity. If it leaks, ever, you will lose your gear a few microseconds later. Glycol and water, however fancy, won't help here.
There are better (and cheap) fluids, mostly the low viscosity hydrocarbons. Low conductivity, no bugs, and they kill your MOBO quite a bit more slowly if they leak. But, you have to upsize the system's radiator and flow rate.
I don't claim to be a scientist, but one thing struck me when I was reading the page about your project. At the end you kind of complain about the ambient temperature in the room from your cooling system. But you also complain that your stage 3 temperatures were higher then your Stage 2 temperatures. Yeah, I'll bet. If you really want to know what is just from the cooling system you have to adjust the room temperature so it is constant.
I mean, it it's the winter time in the first example and your temperature is low, but your room temperature is 65F, then that's one thing. But, if your temperature is high and it's the summer and your room temp is 85F then that's something else entirely.
It seems to me it's possible you have an uncontrolled variable roaming around destroying your data.
his profession: sanitary engineering! ...
his avocation: cooling!
the computer is online
i am not at it
what a waste of ressources
i'll just remark, that this has been discussed a gazillion times before. now let me finish my hat, i didn't have breakfast today.
*gnaw*
%-)
the computer is online
i am not at it
what a waste of ressources
A few people emailed me indicating that they were having problems getting the Matlab/Octave code to run.
Most of those lines require Matlab's Signal Processing Toolbox or the Octave equivalent. Octave-Forge (http://octave.sf.net/) implements most SPT functionality. (Still no psd() function...)
The ausave() function is Octave-specific and probably needs to be replaced if running the code under Matlab.
retrorocket.o not found, launch anyway?