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cluster:123 [2013/10/10 13:48] hmeij [Replace Dell Racks] |
cluster:123 [2013/10/10 20:05] hmeij |
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+ | To be send to Dave Baird. | ||
==== Replace Dell Racks ==== | ==== Replace Dell Racks ==== | ||
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Subtitle: A win-win solution proposed by Physical Plant and ITS | Subtitle: A win-win solution proposed by Physical Plant and ITS | ||
- | Once upon a time, back in 2013, two Dell racks full of compute nodes, sat noisily chewing away energy on the 5th floor of Science Tower. | + | Once upon a time, back in 2013, two Dell racks full of compute nodes, sat noisily chewing away energy on the 5th floor of Science Tower. |
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+ | The Dell racks contain 30 compute nodes, two UPS units, two disks arrays and two switches. We have measured 19 nodes power consumption (pulling one of the dual power units out) with a Kill-A-Watt meter for over 775+ total hours. The mean power consumption rate is 418.4 watts. That totals to 109,956 KwH/year in power consumption ((watts/ | ||
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+ | Next we need to convert to a dollar value. | ||
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+ | Based on 12.5 cents the Dell compute nodes consume $13,744.50 per year in power. Best guess is cooling costs are at least that (another possible low water mark). So the total cost for both power and cooling consumption is $27,489 per year. | ||
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+ | Next step was to collect vendor quotes for a target budget of $82K, 3 years of Dell energy consumption, | ||
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+ | Old hardware: | ||
+ | 30 nodes, 2.66 ghz, 4 mb L-cache (for cpu), 240 cores (job slots), | ||
+ | 80 gb local drive, 340 gb total ram, 12,555 watts (power no cooling), 670 gigaflops (actual measure) | ||
+ | |||
+ | New hardware: | ||
+ | 14 nodes, 2.60 ghz, 20 mb L-cache (for cpu), 224 cores (job slots), | ||
+ | 1TB local drive, 1,792 gb total ram, 5,400 watts (power no cooling), 4,659 gigaflops (theoretical) | ||
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+ | In the representative example for new hardware the total energy consumption would be 10,800 watts. | ||
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+ | The total cost of running the new hardware would be $5,913 per year. That would imply savings of $21,576 per year. The job slot count would be 112 but with hyperthreading technology that can be doubled. We'd still want the 1,792 memory footprint (8 gb/core) and the gigaflops (2,329) still far exceeds Dell's performance. | ||
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+ | In two years, the new hardware would have saved $43,152 on energy costs based on the low water mark (Dell' | ||
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+ | * There are enough Infiniband ports available to put all new hardware nodes on such a switch (add cards and cables cost for each node) | ||
+ | * The internal disks on each node need to be of a high speed (10K or better) and of a certain size (300 GB or larger) mimicking the Dell disk arrays (adds costs) | ||
+ | But it is all very doable within a budget of $45-$50K. | ||
- | The end. | + | The Libert family rejoices. |
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