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CHAPTER 1 PROPOSING VIRTUALIZATION
Virtualization allows you to manage your production environment more fl exibly, from any-
where, at lower costs and with a reduced level of risk. By leveraging virtualization, you can pro-
vide small-scale environments that are cost effective and that scale up very easily.
Hyper-V R2 increases this level of fl exibility by introducing a new processor compatibility
feature. Processor compatibility allows you to move a running virtual machine to a physical
computer with different set of processor features, without having to restart the virtual machine.
This setting may reduce the overall performance of the application in the virtual machine on
nodes that would otherwise support advanced virtualization hardware techniques. However, it
will allow virtual machines to be live or quick migrated between nodes of differing processor
capabilities.
High Availability
Leveraging virtualization for high availability purposes provides businesses with a vast array of
high availability solutions from both Microsoft and third parties. These solutions provide high
availability for applications that need to recover from failures to complete fault-tolerant solu-
tions for those critical applications that must run continuously without service interruption.
Virtual machines that do not have cluster-aware software can leverage the high availability
features in Windows 2008 R2 to implement high availability through host-based clustering.
The level of availability that a host-based clustering provides is not as high as with application-
specifi c clustering or guest-based clustering, because the operating systems or applications
deployed within the virtual machines are not necessarily cluster-aware.
With Hyper-V R2, a confi guration with host-based clustering provides support for both
planned and unplanned downtime. During unplanned downtime, the virtual machines will be
restarted on a node within the cluster, and during planned downtime, the virtual machines will
be transferred, either via Live or Quick Migration, from one node to another.
Conversely, guest-based clustering enables high availability of services and applications at
the virtual layer.
The Private Cloud
The private Cloud is an internal service-oriented infrastructure, optimized for both per-
formance and cost, which is deployed inside your datacenter. You can think of the private
Cloud as IT-as-a-service, where virtual machines are provisioned to meet business demand.
Virtualization effectively unlocks Cloud computing and is a fundamental building block of
Cloud computing. The private Cloud in Microsoft’s terms is powered by a number of differ-
ent server products, including Windows 2008 R2, Hyper-V R2, and the System Center family of
products. The private Cloud offers a number of benefi ts:
u A fl exible and familiar infrastructure with a common platform to build and deploy appli-
cations between clouds and reduce development and deployment time on new services
u Integrated resource access that enables federated services between clouds, helping ensure
capacity and resources needed to achieve the business requirements
u The agility to develop applications and services once and then deploy them in and across
any cloud environment, enabling rapid response to changing business needs
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