VMware VIEW COMPOSER 2.5 - ARCHITECTURE Manuale Utente Scaricare il pdf (Pagina 37)

EMC Infrastructure for Virtual Desktops Enabled by EMC VNX Series,

VMware vSphere 4.1, VMware View 4.5, and VMware View Composer 2.5 Proven Solution Guide

Sizing on the average IOPS can yield good performance for the virtual desktops in

steady state. However, this leaves insufficient headroom in the array to absorb high

peaks in I/O and the performance of the desktops will suffer during boot storms,

desktop recompose or refresh tasks, antivirus DAT updates and similar events.

Change management becomes the most important focus of the View administrator

because all tasks must be carefully balanced across the desktops to avoid I/O

storms.

To combat the issue of I/O storms, the disk I/O requirements can be sized based on

the 95

percentile load. Sizing to the 95

percentile ensures that 95 percent of all

values measured for IOPS fall below that value. Sizing by this method ensures great

performance in all scenarios except during the most demanding of mass I/O events.

However, the disadvantage of this method is cost because it takes 77 disks to satisfy

the I/O requirements instead of 23 disks. This leads to higher capital and operational

costs.

Use cases

Six common use cases were executed to validate whether the solution performed as

expected under heavy load situations.

The following are the tested use cases tested:

• Simultaneous boot of all desktops

• View refresh operation on all desktops

• View recompose operation on all desktops

• Full antivirus scan of all desktops

• Installation of five security updates using SCCM on all desktops

• Login and steady state user load simulated using the Login VSI medium workload

In each use case, a number of key metrics are presented showing the overall

performance of the solution.

To run a user load against the desktops, the Virtual Session Index (VSI) tool was

used. VSI provided the guidance to gauge the maximum number of users a desktop

environment can support. The Login VSI workload can be categorized as light,

medium, heavy, and custom. A medium workload was selected for testing and had

the following characteristics:

• The workload emulated a medium knowledge worker, who uses Microsoft Office,

Internet Explorer, and PDF.

• After a session had started, the medium workload repeated every 12 minutes.

• The response time was measured every 2 minutes during each loop.

• The medium workload opened up to five applications simultaneously.

• The type rate was 160 ms for each character.

• The medium workload in VSI 2.0 was approximately 35 percent more resource-

intensive than VSI 1.0.

• Approximately 2 minutes of idle time were included to simulate real-world users.

Each loop of the medium workload opened and used the following:

• Microsoft Outlook 2007—Browsed 10 messages.

• Internet Explorer—One instance was left open (BBC.co.uk), one instance browsed

Wired.com, Lonelyplanet.com and a heavy Flash application gettheglass.com (not

used with MediumNoFlash workload).

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