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Modeling capacity in virtual environments

This blog post was written by Megan Santosus, features writer for

By now, server virtualization has pretty much proved its mettle as a way to consolidate data centers and reduce costs. As virtualization has gone mainstream, some of the management challenges have become top of mind. Consider the situation for a senior IT manager at a financial services company, who spoke on the condition of anonymity. “Virtualization is great stuff,” he said. “But it does change the way you manage things.”

Two years ago, the financial services company began implementing virtualization — specifically VMware and ESX Server, although the company has since deployed virtualization with Sun Solaris clusters. At that time, the company realized that it had a gap in virtual server management capabilities. “We are making a large push with ESX servers, and we want to manage them holistically with some of the other servers in our environment,” the IT manager said.

To that end, four months ago the company began beta testing CA Advanced Systems Management r11.2; the company already uses the previous version of the software, and one of the enhancements with 11.2 is integration with VMware VirtualCenter. By installing an agent on VirtualCenter and another on the CA management server, the company now collects and aggregates the performance data for virtual machines into a centralized Web-based system. “We take the performance data on the physical ESX server and provide that to our capacity team so they can plan and manage our virtual environment,” the IT manager said.

For the capacity team, virtualization means being able to figure things out in advance such as how many hosts can run on an ESX server, what’s the footprint of the application, and whether it’s best to put components on the same physical box or spread them out. “We can now give the capacity team performance data they need to make the decisions about moving things around,” the IT manager said. Rather than planning, the IT manager likens the process now to capacity modeling. “If we want to move virtual servers running Oracle, Apache and Weblogix, we look at the performance data to make our decisions.”

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