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--- cluster:123 [2013/10/10 14:44]
hmeij
+++ cluster:123 [2013/10/10 15:21]
hmeij
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 TB local drive, 1,792 gb  total ram, 5,400 watts (power no cooling), 4,659 gigaflops (theoretical)
-In the representative example above we almost match Dell's job slots total (224 vs 240 However the power consumption would be 2,700 watts and the gigaflops 2,329 (we're doing more work per clock cycle but not increasing performance of the CPUs). That means the new hardware consumes 20% of the Dell's power consumption (does not include not cooling). The total KwH cost of running the new hardware is 20,402 KwH/year or $5,100.
+In the representative example total energy consumption would be 10,800 watts.  If we reduced the node count to 7 the total energy consumption would be 5,400 watts (47,304 KwH/year) or 43% of the Dell's power consumption (does include cooling). And that's against the low water mark.
+The total cost of running the new hardware would be $5,913. That would imply a savings rate 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 still far exceeds Dell's performance.
+Within two years, the new hardware (about $41K) will have paid for itself based on the low water mark (Dell's cost would equal $55K). We still need to adjust some minor issues:
+  * there is enough Infiniband ports available to put all new nodes on such a switch (add cards and cables cost)
+  * the internal disks need to be of higher speed (10K or better) of a larger size (300 GB or larger) mimicking the Dell disk arrays (add costs)
+But it is all very doable within budget of $45-$55K
 The end.

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