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Server Virtualization As A Way To Improve Flexibility

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Server virtualization is a main IT trend on which firms are focusing their attention and their investments. Virtual servers are primarily used for the purpose of server consolidation, which is running two or more virtual machines on a single physical system. Virtualization is an effective method to save money on hardware, maintenance, management and administration.

Server Virtualization As A Way To Improve Flexibility

Most of server virtualization projects are also server consolidation project in the sense that one of the main project results is an impressive reduction of the number of servers. There are server virtualization projects that do not aim at reducing the number of servers, but those that focus on server consolidation produce impressive reductions of the number of servers. The net result is that large server farms consisting of hundreds of servers are replaced by very few servers hosting hundreds of Virtual Machines (VMs).

The power consumption can be significantly reduced and if that is what the company aims at, the results can be pretty successful. A server virtualization project entails new software licenses costs, e.g., for the Virtual Machine Monitor software, but under some circumstances it can also deliver a significant reduction of software licenses costs.

Flexibility is very important in the long term. On a non-virtualized server the only technology that you can buy to improve the dependability of your system is all in all a high availability cluster. Unfortunately these clusters are expensive, complex to maintain and moreover to have full support they entire solution must be certified by the SW vendor. Protection can be delivered at the Virtual Machine Monitor level rather than the application level. This is somewhat less appealing because there is no protection in case of application failure or freezing when the hosting operating system is up and running. But on the other hand it is a very simple to implement, application-agnostic technology that makes it possible to improve the dependability of all the servers in the server farm.

Server virtualization projects can deliver significant financial and other benefits. However, before selecting the software, it is advisable to conduct in-depth comparative analysis concerning performance and proficiency. The analysis will help you to find a virtual server exactly according to your unique requirements.

You need to be aware of the fact that many applications do not run properly in the virtual environment. Some might not give optimal performance, while other might not utilize the power of the resources fully. To get maximum benefits of server virtualization, you should make sure that the applications run appropriately in the virtual environment.

Server virtualization enhances the overall security of the system. Keep in mind that the complete set of benefits of virtualization can only be achieved when the hardware capabilities match perfectly with the server requirements. In order to achieve this objective, intensive capacity planning becomes crucial. For the virtual servers to give optimum performance, you would need to provide adequate RAM, appropriate physical and virtual hard disks, good network adaptors and sufficient number of CPUs.


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