“热IT”是虚假经济？温度和位置对效率的真正影响.pdf

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1、OCP Regional Summit|April 19,2023|Prague,CZRichard KennyManaging Director,InteractGroup Research and Sustainability Director,TechbuyerVisiting Research Fellow London South Bank University(LSBU)School of Engineering“Hot IT”a false economy?The true impact of temperature and location on efficiencyDCD a

2、rticle February 2023Movement towards higher temperature envelopesEvidence of energy savings as a resultDecreased incidence of failure as a result But is this the full story?Raising temperatures a false economy?Enterprise servers,not OCP hardwareServer age variation 2012-2017 release date Primary var

3、iable is CPUAir cooled,not liquid cooledAiredale case study of LDEX DC3Assuming homogeneous racks of profiled serversModelling for enterpriseEnvironmental control:Temperature:15-35CPressure:0-25Pa Laminar flow at server inletBenchmarking with SPEC SERTVariation limited to 20-30C,aligns with ASHRAE r

4、ecommendedPressure tested at 0Pa and 20Pa(Compatible with Open Rack width equipment)First benchmark testing,published IEEE Profiling Results:EfficiencyEfficiency scores drop due to power increases,workload performance unaffected.Other factors coming into playEffects of temperature and pressure most

5、obvious at extremes of utilisation.2-6%more power due to temperature.Reduced by 2-4%by increasing pressure.Oldest server(R620 E5-2690)worse performer at highest temperatures.R640 Silver 4116(A3 class)performs best.Least change due to temperature but low performance.Server Metrics(CPU)CPUs stay withi

6、n recommended ranges,small variation in power and temperaturesServer Metrics(Fan)Fan speeds increase significantly at higher temperatures,less so with higher pressures.Changes in fan speed dont wholly reflect changes in power.Cooling and utilizationTemp raised