Oracle On Demand Infrastructure Virtualization with Oracle VM

Short Description
Oracle On Demand offers the broadest portfolio of solutions in the industry, including subscription and managed applications that accelerate business results, reduce costs, and lower risks. For customers to achieve these benefits, Oracle On Demand invests in advanced technologies and continuously improves services.
Reviewing the evolution of the Oracle On Demand Managed Services Grid gives context and rationale to Oracle’s virtualization efforts. Over the last four years, Oracle has leveraged commodity servers to enhance services by hardening security and adhering to new deployment standards. Oracle further enhanced services by improving the test infrastructure and isolating critical production workloads. While these operational enhancements were being deployed, Oracle continued to rapidly adopt new infrastructure technologies that increased customer capacity. Most recently, Oracle has been replacing single-core servers using two units of space in a server rack (2U) with dual-core servers using one unit of space (1U) - in effect, quadrupling the capacity of the Oracle On Demand Managed Services Grid.

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SERVER VIRTUALIZATION
Server virtualization enables a single physical server to house multiple operating environments. Virtualization emulates the physical presence of a server so that more than one server, for example a Windows print server and a Linux file server, can be hosted on a single computer. Each of the software server environments is referred to as a virtual machine. Virtual machines are independent operating environments comprised of the underlying operating system and all required server software and data.
Virtual machines appear to the guest operating system as independent systems but are actually simulated by the host system. Virtualization, in effect, decouples software from the hardware on which it runs. As a result, virtualization provides a method for managing systems and resources by function rather than by locations or how they are organized.
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Consolidation Versus Virtualization
Sometimes the terms consolidation and virtualization are used interchangeably because both achieve the same end, but by different means. Virtualization provides a way to retain a function (for example, two middle-tier servers in a test environment) while optimizing the underlying hardware. Consolidation is a process that completely removes the function and the underlying hardware.
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