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A Descriptive Study of Virtual Desktop Power Savings

A Descriptive Study of Virtual Desktop Power Savings . Greg Campbell and Adam Stephens. Agenda. 1) Introduction Green IT Initiatives at OU 2) Virtual Desktop A Brief Overview OU VDI Trial 3) Method Power Basics VDI Power Savings Equation Filling the Equation. 4) Results

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A Descriptive Study of Virtual Desktop Power Savings

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  1. A Descriptive Study of Virtual Desktop Power Savings Greg Campbell and Adam Stephens

  2. Agenda • 1) Introduction • Green IT • Initiatives at OU • 2) Virtual Desktop • A Brief Overview • OU VDI Trial • 3) Method • Power Basics • VDI Power Savings Equation • Filling the Equation • 4) Results • Sample of Power Savings • 5) Discussion • Significance of Power Savings • VDI In Higher Education • 6) Extended Results • Full Spreadsheet VDI Power Savings Ohio University

  3. 1) Introduction Buzzword: Green IT • Environmental Responsibility or Common Sense? • 55% of Businesses Say Money is Number 1 Reason for Green Initiatives. - Forrester, 2007 • Other Higher Education Incentives: • PR for Enrollment and Student/Faculty Attitude • State Mandate (Ohio HB 251) • 20% Energy Reduction by 2014 from a 2004 Baseline VDI Power Savings Ohio University

  4. 1) Introduction Green Initiatives at Ohio University VDI Power Savings Ohio University

  5. 1) Introduction Ohio University Initiatives • Established and Standardized ESX (VMware) Environments • Migrated 50 Servers to Virtual Machines • Decommissioned 50 Physical Servers • Consolidated to New SAN Storage Environment • Trial Environment for VDI VDI Power Savings Ohio University

  6. 2) VDI A Brief Overview of VDI • Computing at the Server • Use of Thin Clients • In Theory: Same Desktop Experience Diagram: VMware VDI Power Savings Ohio University

  7. 2) VDI Benefits and Considerations of VDI • Security • Data Stays in Data Center • Organizational Changes • Difference in VDI Environment • How does support change? • Cost • Thin Clients vs Desktops • Storage and Backups • Technology Limitations • Multimedia Support VDI Power Savings Ohio University

  8. 2) VDI VDI Savings Potential • ICT Responsible for 2% Global Emissions • Gartner, 2007 • VDI context: PCs and Monitors • 39% of 2% • But How to Find Real Power Savings? 39% Chart: Gartner, 2007 VDI Power Savings Ohio University

  9. 3) Method Power Basics • Watt (W) is a Rate of Energy Use • One Joule Per Second • Kilo-Watt Hour (kWh)an Amount of Energy Use • Total Hours × Total Watts / 1000 • Metric for Final Savings VDI Power Savings Ohio University

  10. 3) Method Equation for VDI Power Savings • VDI Factors: (1) Traditional Personal Computers (PCs) (2) Thin Clients (TCs) + (3) Server (S) • For Each, We Need to Know Total Hours and Total Watts • Savings = Before − After PCH×PCW − (TCH×TCW + SH×SW) VDI Power Savings Ohio University

  11. 3) Method Method for Finding PC Hours • Two Types of Desktop Users: 1) Aware: • Leaves Device Turned on 9 Hours Per Workday • Turns Off Desktop for Weekends and Vacation/Holiday • 9 (Hours/Day) × 254 (Days/Year) = 2286 Total Hours 2) Unaware: • Leaves Device Turned on 24 Hours Per Workday • Leaves Device Turned on Over Weekends • 24 (Hours/Day) × 365 (Days/Year) = 8760 Total Hours • Ratio of Awareness: 36% VDI Power Savings Ohio University

  12. 3) Method PC Rate of Consumption • States of Operation: Off, Idle, Max Utilization, and Everywhere in Between • All of Which Draw Different Power • Compromise: Assume Two States (Idle & Load) • Determine Power Draws at Idle and Load • Actually Metered or Online Specs • Determine Time Ratio: 90% Idle VDI Power Savings Ohio University

  13. 3) Method Typical Workplace PC • Specs • 2.1 GHz AMD Single-Core CPU • 1.5 GHz Memory • 40 GB HDD • Power Results – Metered From Wall • Idle: 65 W • Load: 120 W • Average: 70.5 W (Given 90% Idle) VDI Power Savings Ohio University 13

  14. 3) Method Thin Client • Same Method for Hours • OU VDI Trial As Case Study • Wyse V10L Thin Clients • Found: • 3 W Off • 13 W Idle • 13 W Load • Average: 13 W VDI Power Savings Ohio University

  15. 3) Method Server Power: A Speculative Method • Find Maximum Draw • APC online calcultor • Inputs: Model, CPU(s), Data Storage • NOT Nameplate Power Rating • Multiplier: Utilization Percentage • 74.5% Industry Average • Multiplier: PuE (www.thegreengrid.org) • 2.3 Industry Average Average Draw = Max. Draw × Util. % × PuE VDI Power Savings Ohio University

  16. 4) Results Results Sample • VDI Application: 100 Users, Replacing Typical Workstation PCs with Thin Clients • Energy Pricing is Regional (OU) VDI Power Savings Ohio University

  17. 5) Discussion What’s Important? • Power Savings Are Not Massive, However: • HB 251: Need for Power Savings • Additional Benefits (Security, Management) • Power Is Not The Only Money Consideration • Collective Green IT Potential • Innovate To Transform • Large Variation in Results VDI Power Savings Ohio University

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