The Ultimate Do-It-Yourself Linux Box
Never underestimate the importance of a good power supply for your do-it-yourself system, especially if you intend to use two video cards configured in SLI mode. You can experience all kinds of bizarre symptoms of instability if you underpower your system with an inadequate power supply. Don't go for anything less than a 500-Watt power supply if you intend to use two video cards in SLI mode. Go even higher if you intend to add other PCI cards to your system. And, when you shop for power supplies, be careful to look for efficiency ratings. Some power supplies boast good peak output, but the sustained output can still be inadequate.
There's almost no point in choosing a power supply based on its rated mean time between failures (MTBF), that is, how long it should last. We suspect these figures reflect how long the power supply lasts assuming the fan never fails. Unfortunately, power supply fans fail all the time. The power supply overheats, and kablooey, so much for the mean time between failure rating. Your mileage may vary, but we've had the best luck with Enermax power supplies and their fans.
You will need a power supply with a 24-pin power connector to the motherboard for any of the motherboards we tested. You also will need a power supply with connectors for two video cards, so that you can use these motherboards in SLI mode. We chose the Enermax ELT500AWT 500-Watt power supply for our system. It sells for about $100 US, depending on your source. We also used a Silverstone SST-ST65ZF 650-Watt power supply for a similarly configured system. It sells for about $170 US, depending on your source. We've had these power supplies only for a few weeks at the time of this writing, but they both work well so far—knock on wood.
We pulled out all the stops when it came to a case for our Ultimate Do-It-Yourself System. We chose the Silverstone TJ07-S case, which sells for about $365 US, depending on your source. This is quite expensive for a case, but it is worth the investment. First, the thing is huge. It's larger than any tower case we've ever tried. This gives you tons of room to work when you insert cards and cable the system. On the other hand, if you're looking for a case you can place on top of the desk instead of beside it, this is definitely not the case for you.
The hard drives are tucked away in two separate removable compartments, and each compartment is cooled with its own separate 120mm fan. It has two more 120mm fans at the top of the case, and two rear 92mm intake fans. The case is remarkably quiet, considering it has six fans, not including the CPU fan, power supply fans and so forth. All this ventilation keeps everything very cool without having to invest the time and effort in creating a liquid-cooled system.
The case has a flip-down front accessory panel with connectors for audio, USB and FireWire. The panel is flush with the front of the case, so you simply press on the bottom of the panel to open it. Some people might be annoyed that there's no spring loading, no button and no catch for the panel, either in its open or closed state. We have no complaints with it though.
The only way to press the reset switch is to use a wire tool, which you insert into a small hole in the front of the case. Some people will hate this feature, others will appreciate how it protects you from accidentally resetting your system.
You can certainly find adequate cases for far less money, and some of them may even place things like the accessory jacks in more convenient locations. But, we found this to be a superb case primarily because of how easy it is to work inside it (thanks to its gigantic size) and superior ventilation without having to use liquid cooling.
If you're going to go the budget route, there are so many decent cases from which to choose, we're hard pressed to recommend one over another. Each has its advantages and disadvantages. We chose the Thermaltake Tsunami VA3000BWA, which sells for just over $100 US at most outlets. It's not as high class as the Silverstone, and we found it frustrating to get the DVD drive installed, but it's a fair case for the price. It has a flip-up top accessory panel. People who leave things on top of their computer case will find this inconvenient, but the same must be said of the Silverstone case, as it has top-mounted fans you can block by leaving manuals or other paraphernalia on top of the computer.
Yes, you can use two NVIDIA cards in SLI mode on Linux—if you don't mind running the proprietary NVIDIA driver, which taints the Linux kernel. We chose a pair of eVGA GeForce 7900GT cards with 256MB of RAM. These cards are a great compromise between price and performance. The combination of cards totals at about $500 US, which is less than the price of a single NVIDIA 7900 GTX card (about $570 US). eVGA sells basically the same cards with different clock speeds at different prices. For example, budget-minded folks can get a single eVGA GeForce 7900GT Signature 256MB (same basic model as the ones we used in SLI mode) with higher clock speeds for about $360 US.
You obviously have more choices than eVGA when it comes to video card manufacturers. We chose eVGA for our examples simply because the company produces a large selection of prices and configurations of NVIDIA cards, which made it easy to pick cards to fit varying budgets. We've had good success with other brands as well.
If you opt to use the NVIDIA proprietary drivers, you need to add the following line to your xorg.conf file:
Option "SLI" "Auto"
We also recommend that you dig through the NVIDIA HOWTO to learn how to specify whether you're using a digital or analog connector. Some monitors like to guess which interface you're using for five seconds or so, which can cause annoying delays when you start your desktop.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide