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6: A Most-Significant Step—“Virtualizing” Your IT Systems 89

…
APP 1 APP 2 APP 3 APP 4 APP 7 APP 8

System 1 System 2 System 4
10% Busy 10% Busy 10% Busy
2KW 2KW 2KW

APP 1 APP 2 APP 3 APP 4 APP 5 APP 6 APP 7 APP 8

Consolidated system
70% Busy ptg
4KW
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®
IBM Redbooks publication REDP-4413-00 The Green Data Center: Steps for the
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© 2008 International Business Machines Corporation. ALL RIGHTS RESERVED.
Figure 6.1 Consolidation of applications from under-utilized servers to a single, more-efficient server

Virtualization: The Greenest of Technologies
An alternate method to consolidation is virtualization, the concept of
dealing with abstract systems. As discussed at the beginning of this chapter,
virtualization allows consolidation of physical servers without requiring
application consolidation. So, as discussed earlier, with server virtualization
we can take ten servers with completely different applications and consoli-
date them onto one large physical server, where each of the ten stand-alone
servers can retain their server name, IP address, and so on. The virtual servers
still look to users as if they are separate physical servers, but through virtual-
ization, we can dramatically reduce the amount of IT equipment needed in a
data center.
Virtualization eliminates the physical bonds that applications have to
servers, storage, or networking equipment. A dedicated server for each