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Oracle Tips by Burleson
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Designing Equipment for Real Application Clusters
It is
critical to ensure that there is no single point of failure in a high
availability configuration. Figure 13.2 illustrates exactly what
eliminating single points of failure means.
Figure 13.2:
Example of a Redundant RAC Configuration
In Figure
13.2, the following redundancies have been added:
-
A second
firewall with an independent connection to the web.
-
A second
application server.
-
A second
fabric switch with redundant pathways.
-
A second SAN
array.
-
A set of
load balancers.
A geo-remote
RAC Guard configuration.
Now, the
single points of failure in Figure 13.1 have been eliminated. A third
server has also been added, as well as a SAN array in a geographically
remote location. This third server and SAN ensure that not even a
disaster at the primary location will bring the application down. (Not
shown is the application server and firewall for this third server. It
may not be required if the firewalls and application servers are in a
different location from the database servers.)
For more information,
see the book
Oracle 11g
Grid and Real Application Clusters 30% off if you
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Written by top Oracle
experts, this RAC book has a complete online code depot with
ready to use RAC scripts.
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