Metering and Managing University of Sheffield Data Centres. Chris Cartledge Independent Consultant

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1 Metering and Managing University of Sheffield Data Centres Chris Cartledge Independent Consultant

2 Summary ICT Electricity Use Footprint Data Centre Electricity Use European Code of Conduct The Electricity Bill Data Centres Metering IT equipment, Measuring and Costing

3 University of Sheffield ICT Electricity Use: 2008 More than 1M/year ~20% institutional use PCs dominate Servers >30% (including HPC & departmental) PCs Servers Network Telephony Printing AV

4 University of Sheffield Data Centres Electricity Servers, Network, PABX, including departmental, remote cabinets Over 40% of ICT use ~ 400,000 p/a Possibly more PUE estimate 1.5 PCs Data Centres Printing AV

5 Sheffield Data Centres Two conventional central data centres Secure, dark, open plan no aisle separation Both with Generator, Room UPS Conventional aircon - no passive cooling Low set point of 21o C Input air cold at 14 o C Hot spots because of poor circulation

6 Data Centre Provision Primary Secondary Offices above Dedicated building 64 racks (plus 15 data) 28 racks 300 (3*100) kw power 120 (3*40) kw power 100kW cooling (N+1) 120 kw (N+1) cooling False floor and ceiling False floor, low ceiling 130,000 p/a 90,000 p/a electricity

7 Electricity Cost 10p per unit (per kilowatt hour) or more! Perhaps plus VAT (5%) and climate change levy? Increasing, so say 12p per unit Overheads for air conditioning and the rest Power conversion, UPS, aircon, fans, lighting, In a cooled space: perhaps 20p per unit Over a year of 365*24 = 8760 hours 1.60 to 2.10 per watt per year

8 Metering currently partial Main Estates meters manual readings or CSV Not real time, but important for PUE, tallies with other sources UPS - SNMP input and output available Real time, online, but not fine grained enough Servers - some (about 40%) have internal metering Not all models (Sun Tx but not Mx), some at additional cost Network boxes, tape drives, PDUs, fans, etc Spot measurements on cabinets with clamp meters Needed to balance phases 2bm imeter intelliamp is simple to use Unite CL-amp unit needs calibration

9 Metering futures Want to meter each rack Some investment necessary and ROI not clear Does allow monitoring and control for changing air conditioning Strategic way: monitor at the distribution point as part of install Possible to retrofit at rack, in line at the socket Solutions in increasing complexity include Metermaid Cheap - manual kwh readings only Olsen Remote SNMP - comprehensive real time reading readings APC, Unite and others Metered PDUs per socket readings, remote power management, etc

10 Power Use Data Centre A Registered for EU CoC Average PUE: 1.7 Consultants estimated conservatively 2.0 kwh Overall/day IT/day /12/ /03/ /07/ /10/ /01/ /05/ /08/2010

11 Power Use Data Centre B Newer carefully designed Spot PUE: 1.7, but average PUE: 1.86 Kwh Overall/day IT/day /12/99 09/01/00 19/01/00 29/01/00 08/02/00 18/02/00 28/02/00

12 Machine Room A: Machine Room B: CoC Figures PUE and Bills PUE: 1.70 (Consultants estimated 2.0) Over 15 months, for EU Data Centres CoC Annual consumption: 1,300,000 kwh PUE to end of 2010: 1.85 Spot measurement by consultants: 1.7 Annual consumption: ~900,000 kwh Average EU CoC PUE: 1.8 (DCiE 56%) Best practice PUE ~1.2 Sheffield wasting perhaps 65,000 p/a on cooling

13 Project to Improve PUE Project underway to manage airflow Salix funded Phased approach with Data Centres live Equipment now relocated Containment to be fitted Hot aisle in DC A Cold aisle in DC B (no ceiling void) Seal racks Potentially include free cooling units Increase set point temperatures Metering needed to watch IT consumption

14 Data Centre Set Point ASHRE recommend input air: 18o C to 27 o C was 20 o C to 25 o C up to late % saving claimed, for 1o C higher Up to 20% aircon saving by raising to 26 o C? But equipment fans may work harder And aircon performance not simple Issue over managing this change

15 PUE Not Everything CoC sets out a complete plan Practical examples: Virtualisation processors SAN Switching off Idle equipment Sheffield HPC idle nodes are powered down Buying energy efficient equipment low power processors/memory efficient power supplies smaller 2.5 disks

16 Measuring Power Use Manufacturer's figures, where they exist Measure devices instantaneously or over a period Use meter readings Remember aircon, UPS overheads

17 IT Equipment Buying Typically, it is blind to electricity consumption The bill is somebody elses responsibility Information not easily available from suppliers Cost from configuration tool Complex IT issues dominate Dell and HP now have calculators Sheffield includes life cost of electricity in VFM

18 Example - Sun X2200 HPC Server 25% Power Saving: 140 p/a Standard, 2PSU, 16*2GB Standard, 1 PSU, 16*2GB Working Idle Standby Standard, 1 PSU, 8*4GB HE Processor, 1PSU, 8*4GB

19 European Code of Conduct European Code of Conduct on Data Centres Energy Efficiency adopted in Best Practice Guidelines to enable change About 120 good practices: over all aspects Unlikely to become compulsory HEFCE mindful of University independence But good for reputation Organisations can sign up

20 Group Involvement Establish a cross disciplinary change board Consider impacts, ensure effective solution Definition of standard IT hardware M&E implications of new services Audit existing equipment optimise and consolidate where possible Virtualisation Set point Identify and deal with little used and unused services

21 Some Top Rated Practices Buy energy efficient IT devices Use virtualised servers and storage Switch off hardware for unused services Virtualise little used services Separate cold air from heated return air Use free or economised cooling Increase temperature set points

22 Conclusion There is a lot that can be done to Improve PUE Reduce electricity consumption and costs Meet wider agenda There are issues Good information needed - metering Split responsibilities Costs are currently hidden Investment needed to make progress

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