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cluster:123 [2013/10/10 14:08] hmeij [Replace Dell Racks] |
cluster:123 [2013/10/11 13:15] hmeij |
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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. |
- | 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/ | + | 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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- | Based on 12.5 cents per Kwh (this is an all inclusive cost including natural gas cost, heat recoup costs, distribution, | + | Next we need to convert to a dollar value. A residential electric bill contains a KwH cost as well as generation, distribution, |
- | + | 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 | |
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- | If we could replace, or approximate, | + | |
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- | So, I've collected quotes | + | |
+ | Next step was to collect vendor quotes for a target budget of $82K, 3 years of Dell energy consumption, | ||
- | + | Old hardware: | |
- | old racks: 30 nodes, | + | 30 nodes, |
- | + | 80 gb local drive, 340 gb total ram, 12,555 watts (power no cooling), 670 gigaflops | |
- | vendor 1: 14 nodes, 224 job slots, | + | |
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- | vendor 2: 10 nodes, 200 job slots, 4,597 watts, | + | |
- | + | New hardware: | |
- | 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). Our conclusion was " all power consumption is $27,489 per year". That means $55K is enough and our ROI is 2 years. | + | 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) | ||
+ | In the representative example for new hardware the total energy consumption would be 10,800 watts. | ||
- | My intention is to convince | + | The total cost of running |
- | + | In two years, the new hardware would have saved $43,152 on energy costs based on the low water mark (Dell' | |
- | -Henk | + | * There are enough Infiniband ports available to put all new hardware |
- | + | * 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 | |
- | + | * we maybe able to add two more nodes by switching to a more exapansive lower wattage CPU (and remain within budget as well as below the 50% energy consumption threshold as compared with Dell' | |
- | From: Meij, Henk | + | * accomplished by switching from 8 core 2650v2 |
- | 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 | + | |
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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 | + | |
- | 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 | + | |
- | 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' | + | |
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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 | + | |
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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. | + | |
+ | But it is all very doable within a budget of $45-$50K. And it can be the solution for: | ||
+ | * replace Dell's racks functions and match or exceed its performance | ||
+ | * seriously reduce energy consumption benefiting Physical Plant' | ||
+ | * allow ITS to treat the third Liebert cooling tower as backup/ | ||
+ | * being way green | ||
- | The end. | + | The Libert family rejoices. |
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