BENEFITS OF VIRTUALIZATION IN ON DEMAND With virtualization, On Demand customers benefit even further through:
A highly available and serviceable architecture.
The current On Demand policy contains deployment scenarios that require additional physical servers, for example the deployment of a DMZ function or an additional instance. With virtualization, the complexity associated with managing additional servers could be reduced in some cases and in others, may be eliminated altogether. For example:
A non-production DMZ server could be deployed as a virtual machine and still provide the testing function it serves
An additional instance could be deployed as a virtual machine in the existing non-production infrastructure
Although it is preferable to avoid it, downtime is sometimes inevitable. These outages are either planned or unplanned and often require recycling physical servers. Each time a server is brought down, it must be brought back up and tested before returning the service to affected customers. After virtualization is in place, fewer physical servers will require restarting, therefore reducing the overall downtime when outages occur. As virtualization evolves, there may be opportunities to reduce, or in some cases eliminate, the downtime required to service a customer.
Maintain High Standards While Optimizing the Infrastructure
Oracle has continually enhanced services by separating and isolating specific functions while providing customers with updated technology. Today, On Demand customers are provisioned on 64-bit Oracle Enterprise Linux systems running dual- core or quad-core servers. These powerful systems—backed by the enterprise-class support of Oracle Unbreakable Linux, enable Oracle to consolidate functions while retaining the integrity of the architecture. Examples include:
Keeping the same topology between production (PROD) and test (TEST) environments. For example, if multiple middle-tier servers are in production, Oracle can provide multiple virtual machines in the test environment to support proper testing of the multiple middle-tier environments;
Providing a virtual DMZ in the test environment to support proper testing of external functions;
Segregating application and database tiers into two separate environments.
Oracle On Demand Server Virtualization Page 5