Information Technology Reference
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with proper care. However, you cannot stop there; you absolutely must test, test, and test again
any solution to make sure that your solution works as designed and, most important, that it will
work when you need it.
h
e Bottom Line
Understand Windows clustering and the different types of clusters. Windows clustering
plays a central role in the design of any high-availability solution for both virtual and physi-
cal servers. Microsoft Windows clustering gives us the ability to have application failover to
the secondary server when the primary server fails.
Master It Specii cally with regard to Windows clustering in a virtual environment,
what are three different types of cluster coni gurations that you can have?
Master It What is the key difference between NLB clusters and Windows failover
clusters?
Use vSphere's built-in high-availability functionality. VMware Virtual Infrastructure
has high-availability options built in and available to you out of the box: vSphere High
Availability (HA) and vSphere Fault Tolerance (FT). These options help you provide better
uptime for your critical applications.
Master It What are the two types of high-availability options that VMware provides in
vSphere, and how are they different?
Recognize differences between different high-availability solutions. A high-availability
solution that operates at the application layer, like Oracle Real Application Cluster (RAC), is
different in architecture and operation from an OS-level clustering solution like Windows
failover clustering. Similarly, OS-level clustering solutions are very different from hypervisor-
based solutions such as vSphere HA or vSphere FT. Each approach has advantages and dis-
advantages, and today's administrators will likely need to use multiple approaches in their
datacenter.
Master It Name one advantage of a hypervisor-based high-availability solution over an
OS-level solution.
Understand additional components of business continuity. There are other components
of ensuring business continuity for your organization. Data protection (backups) and repli-
cation of your data to a secondary location are two areas that can help ensure that business
continuity needs are satisi ed, even in the event of a disaster.
Master It What are three methods to replicate your data to a secondary location and
what is the golden rule for any continuity plan?
 
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