User guide

© 2011 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Cisco Validated Design Page 108
●
This workload emulates a medium ―knowledge worker‖ using the Office 2007, IE and PDF applications and
opens up to 5 applications simultaneously with a type rate of 160ms for each character. The workload
observes approximately 2 minutes of idle time which closely simulates real-world users.
●
Once a session has been started the medium workload will repeat every 12 minutes. During each loop the
response time is measured every 2 minutes.
●
Each loop consists of the following operations:
◦ Browse and compose Outlook 2007 messages.
◦ Open multiple instances of Internet Explorer based browsing sessions including heavy multimedia
websites.
◦ Open multiple instances of Word 2007 performing open, close and edit operations.
◦ Print and review PDF documents using Bullzip PDF Printer and Acrobat Reader.
◦ Open, edit and close a randomized large Excel 2007 sheet.
◦ Review and edit a PowerPoint 2007 presentation.
◦ Perform zip operations using 7-Zip.
6.4.3 Success Criteria
There were multiple metrics that were captured during each test run, but the success criteria for considering a
single test run as pass or fail was based on two main metrics, Login VSI Max and Login VSI Correct Optimal
Performance Index (COPI). The Login VSI Max evaluates the user response time during increasing user load and
the Login VSI COPI score assess the successful start-to-finish execution of all the initiated virtual desktop
sessions. These two main metrics are important not only based on the raw data that they provide, but also in their
ability to align the test results between the Hosted Shared and Hosted VDI models.
6.4.3.1 Login VSI Corrected Optimal Performance Index (COPI)
The Corrected Optimal Performance Index (COPI) is a calculated from specific measurements during each test
run to determine how many desktops can be run simultaneously without excessively impacting user experience.
The corrected optimal performance index is based on these measurements:
●
The Uncorrected Optimal Performance Index (UOPI) is based on the first 5 consecutive
●
sessions that hit the‖Optimal Performance Max Reached‖ threshold. The ―Optimal
●
Performance Max Reached‖ value is calculated on the response time average of four sessions higher than
2000ms (4 session average response time > 8000 ms).
●
The Stuck Session Count (SSC) represents sessions which have become stuck before UOPI, and must
therefore be accounted for in the Optimal Performance Index.
●
The Lost Session Count (LSC) is a count of completely missing log files; these tests are discarded
completely in the corrected index.
●
The Corrected Optimal Performance Index (COPI) is then calculated:
Incorporating the SSC and LSC into a corrected index helps ensure that the test results are fair and
comparable. Therefore, the COPI is calculated as:
COPI=UOPI - (SSC*50%) – LSC
6.4.3.2 Login VSI Max
VSI Max represents the maximum number of users the environment can handle before serious performance
degradation occurs. VSI Max is calculated based on the response times of individual users as indicated during the
workload execution. The user response time has a threshold of 2000ms and all users response times are