This preview shows page 1. Sign up to view the full content.
Unformatted text preview: mply by cutting the
number of servers required to run a given set of production
applications, server virtualization can cut IT operating
costs dramatically. The utilization rate of non-virtualized
Windows and Linux servers is typically in single-digit
percentages, and can be comfortably raised to 50% or
more after virtualization. This alone has been enough to
justify the first wave of server virtualization.
But the technology also improves application performance
and availability, and lowers the cost of disaster recovery
systems. These benefits are arguably even greater than
those delivered by consolidation, because they allow IT
departments to improve service levels as well as to reduce
This frees up resources for the development of new
applications, and virtualization has a multiplier effect in
that it also speeds up application development. Virtual
resources can be provisioned to development projects far
faster than physical resources, and with much less labor
and capital cost. When development and testing have been completed, applications can also be moved into
production more quickly. Similarly, pilot programs or proofs
of concept can be completed more quickly and cheaply in
the virtual world than in the physical world. Do not underestimate the challenges
These virtues cut the other way, and can be vices. The
flexibility that virtualization introduces can exacerbate
existing problems or weaknesses in IT management.
Exactly as for physical servers, IT departments need to
maintain security, minimize costs, and maximize service
levels by knowing what virtual servers are running, where
they are running, how they are configured, and what
resources they are consuming. In virtualized environments,
these duties are hugely complicated by the ability to create
virtual servers with ease, and move them from host to host
at will. Furthermore, existing server management tools
built to work only with physical servers can deliver only
a blinkered view of virtual environments. In addition, IT
teams need reorganizing, because vir...
View Full Document
This document was uploaded on 12/31/2013.
- Fall '13