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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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agenda
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

buzzword green it

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

ohio university initiatives

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

a brief overview of vdi

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

benefits and considerations of vdi

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

vdi savings potential

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

power basics

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

equation for vdi power savings

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

method for finding pc hours

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

pc rate of consumption

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

typical workplace pc

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

thin client

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

server power a speculative method

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

results sample

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

what s important

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