Page 126 -

6: A Most-Significant Step—“Virtualizing” Your IT Systems 91

longer needed. The virtualized systems can communicate using the virtu-
alization system’s capabilities, often transferring in-memory data at enor-
mous speed. Performance and energy efficiency increase because the
network components are dropped. Once again, this method reduces the
need for site and facilities resources.
■ Each of the separate systems has its own storage system, namely disks.
The virtualized systems can now share the disks available to the virtual-
ization system. By virtualizing its storage, the virtualization system can
provide optimal disk capacity—in terms of energy efficiency—to the
virtualized systems.

…
APP 1 APP 2 APP 3 APP 4 APP 7 APP 8

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

…
APP 1 APP 2 APP 3 APP 4 APP 7 APP 8

Virtual Virtual Virtual
System 1 System 2 System 4
Virtualization
70% Busy
4KW
These materials have been reproduced by Pearson IBM Press, an imprint of Pearson
Education, Inc., with the permission of International Business Machines Corporation
®
from IBM Redbooks publication REDP-4413-00 The Green Data Center: Steps
for the Journey (http://www.redbooks.ibm.com/abstracts/redp4413.html?Open).
COPYRIGHT © 2008 International Business Machines Corporation. ALL RIGHTS
RESERVED.
Figure 6.2 Virtualization enables us to consolidate systems, keep the same server names, and so on.