54 The Green and Virtual Data Center
3.2 Virtualization Beyond Consolidation—Enabling
Transparency
There are many facets of virtualization. Aggregation is a popular approach
to consolidate underutilized IT resources including servers, storage, and
networks. The benefits of consolidation include improved efficiency by
eliminating underutilized servers or storage to reduce electrical power, cool-
ing, and floor space requirements as well as management time, or to reuse
and repurpose servers that have become surplus to enable growth or support
new application capabilities.
Another form of virtualization is emulation or transparency providing
abstraction to support integration and interoperability with new technologies
while preserving existing technology ...