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Activating Existing Resources

Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.

In this approach, users activate the existing or embedded capacity that may already be available on the enterprise machines. A good example would be HP Superdome computer system. HP often ships such built-in capacity with its Superdome computer systems and makes it possible for users to activate that capacity when needed to acquire additional computing power. Using this approach, HP charges its customers on the basis of CPU utilization.

In IBM?s case, additional CPU power is shipped with certain IBM servers and that CPU power can be activated or turned-on using a software key. IBM?s approach packages what it calls CUoD (capacity upgrade on demand) on many of the servers.

Reconfiguration of Existing Resources

In this approach, the applications can be prioritized ? and when an application requires additional computing power, storage, or memory it can acquire those resources by dynamically reconfiguring other systems to support its computing requirements. A good example is seen in blade servers. They can be re-configured with the required system image on the fly.

Using Grid Resources

When used in the context of utility computing, an application would demand and receive additional computing power from a grid network.

Service Provisioning

The final way that utility services can be obtained is to purchase the services from an external source, called utility service provisioning.

IBM has been spearheading the On-Demand vision for quite some time. It follows a new approach to system management, leveraging its WebSphere enterprise services bus and supported by techniques inherited from grid computing, involving virtualization and dynamic configurable systems. Grid computing techniques such as virtualization, dynamic provisioning, self-discovery and service isolation are the key elements in delivery of on-demand solutions.

There are many companies that are designing and marketing utility computing solutions. IT vendors such as Veritas, Sun, and HP etc., are quite active in this space. Many research analysts believe On-demand computing is on the rise.

A recent survey by Saugatuck Technology indicates that the use of on-demand or pay-as-you-go (PAYG) IT services has grown tremendously in the past year, to the point where more than 20 percent of firms recently surveyed report using one or more such services. An additional 45 percent of firms are considering using PAYG services, with the majority of those expecting to use pay as you go IT and business services within 24 months.

Grid Enablers

So far, many aspects of the grid and grid requirements have been covered. In the next section, some significant grid enabling technologies that are making a big difference will be examined. Particularly, the growth of low cost blade servers as Infiniband communication infrastructure and commodity operating such as Linux are very significant. The helping factors can be briefly summarized as follows:

* Availability of inexpensive, commodity blade servers

* Inexpensive OS optimized for 1 to 4 CPUs such as Linux

* Storage no longer tied to a single server: NAS and SANs

* Fast interconnect technologies such as Gigabit Ethernet and Infiniband


This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters, Rampant TechPress, by Mike Ault and Madhu Tumma.

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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