In the old model, if you lost a resource you might impact one application or one user. Now losing one resource could mean many people and many applications are affected. Your backup and disaster recovery strategy for each individual server might not be sufficient for this new model, as the slightest problem can have a much farther reaching impact. Each resource must now be given more priority and be more extensively monitored and backed up. Similarly, your IT staffing model might be as streamlined and efficient as possible in your current environment, but might be lacking necessary skills to properly set up and maintain a virtual environment. Virtualization is not just a project or a small change; it is a complete shift not only in hardware and software, but in thinking as well.
When moving to a virtual environment you are taking a distributed set of resources and centralizing them. To understand fully what that means, let's consider a few simplified examples of the different types of virtualization.
Storage Virtualization. Data sets that used to be distributed among multiple physical servers and hard drives are all loaded on a centralized device (such as a storage area network or SAN) that different servers can access. You can even boot your servers from a SAN so you no longer need dedicated hard drives in your physical servers.
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