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cluster:123 [2013/10/10 13:08] hmeij created |
cluster:123 [2013/10/10 14:08] hmeij [Replace Dell Racks] |
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==== Replace Dell Racks ==== | ==== Replace Dell Racks ==== | ||
- | A Novella: Replace the Dell Racks with new hardware | + | **A Novella: Replace the Dell Racks with new hardware**\\ |
- | Subtitle: A win-win solution by Physical | + | Subtitle: A win-win solution |
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+ | 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 the dual power units out) with a Kill-A-Watt meter for over 775+ 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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+ | Based on 12.5 cents per Kwh (this is an all inclusive cost including natural gas cost, heat recoup costs, distribution, | ||
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+ | If we could replace, or approximate, | ||
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+ | So, I've collected quotes and they are rolling in. I've taken $82K target as a budget so I can downscale from there. Here is a comparison | ||
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+ | old racks: 30 nodes, 240 job slots, 12,552 watts, 670 gigaflops (a measure of computational performance) | ||
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+ | vendor 1: 14 nodes, 224 job slots, 5,400 watts, 4,659 gigaflops | ||
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+ | vendor 2: 10 nodes, 200 job slots, 4,597 watts, 4,480 gigaflops | ||
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+ | So we can do it with about 40% of the energy consumption. And I can do it with half the number of nodes listed because with hyperthreading the number of job slots can be doubled (just need more memory). | ||
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+ | My intention is to convince the faculty of this. Do you agree? | ||
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+ | -Henk | ||
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+ | From: Meij, Henk | ||
+ | Sent: Wednesday, October 02, 2013 12:10 PM | ||
+ | To: Staye, Peter | ||
+ | Subject: RE: Meeting with Peter 01Oct13 Summary | ||
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+ | oh, btw the nodes are on 208V utility power, makes no difference in our calculations though. | ||
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+ | -Henk | ||
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+ | From: Meij, Henk | ||
+ | Sent: Wednesday, October 02, 2013 11:42 AM | ||
+ | To: Staye, Peter | ||
+ | Subject: Meeting with Peter 01Oct13 Summary | ||
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+ | My attempt at summarizing our conversation. Make corrections if I got things wrong. | ||
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+ | -Henk | ||
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+ | will save y'll the details but after many measurements and meeting with Peter Staye (physical plant) we are both in agreement that the dell 30 compute nodes "total cost for all energy consumption is $27,489 per year" | ||
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+ | Next step was to collect quotes for a target budget of $82K, 3 years of dell energy consumption. | ||
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+ | dell: | ||
+ | 30 nodes, 2.66 ghz, 4 mb L-cache (for cpu), 240 cores, | ||
+ | 80 gb local drive, 340 gb total ram, 12,555 watts (power no cooling), 670 gigaflops (actual measure) | ||
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+ | microway: | ||
+ | 14 nodes, 2.60 ghz, 20 mb L-cache (for cpu), 224 cores, | ||
+ | 1TB local drive, 1,792 gb total ram, 5,400 watts (power no cooling), 4,659 gigaflops (theoretical) | ||
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+ | That means microway hardware burns but 40% of the dell's power (not cooling). | ||
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+ | If we take half the microway nodes, turn hyperthreading on (like on queue mw256, doubling the core count), raise the memory to 256gb/node (8gb/core) we would be very close to dell's job slot offering (224 vs 240), have 5x more memory, and 7x more gigaflops. | ||
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+ | That will easily fit within $55K (two year of Dell power costs) and obtain a ROI of 2 years. | ||
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+ | Peter Staye agrees. | ||
- | Once upon a time, back in 2013, two Dell racks full of compute nodes, sat noisily chewing away energy. | ||