By Nelson Ruest, Danielle Ruest
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Extra resources for Virtualization, A Beginners Guide
This means that since a machine is now completely contained within a single folder, it becomes mobile and transportable. The same machine can run on a workstation, on a server, on a cluster, or even in a remote location. If you want to protect the VM, simply copy the files that make it up to another location. This is why server virtualization technologies are so revolutionary. Try doing any of this with a physical machine! Because all virtual machines are composed of a series of files, it is easy to duplicate them and repurpose them at any time—providing, of course, you have the appropriate physical disk space.
Other tools are available, but the most common are MAP, VGC, VMware Capacity Planner, CiRBA’s, and PlateSpin’s. Keep in mind that whichever tool you use, you must run the analysis over time. Your intent is to identify which systems are running, when they need resources, how many resources they require, when resources are at a low threshold, and when they peak. For this reason, you should run the analysis for at least one month. Running it for this period of time will at least give you the high and low utilization ratios for each server during a monthly cycle.
Because all virtual machines are composed of a series of files, it is easy to duplicate them and repurpose them at any time—providing, of course, you have the appropriate physical disk space. Also, because virtual machines are always made up of at least two files, it is a good practice to place each machine into a folder of its own on the host hard disk. Then, if you need to make a copy, you simply copy the whole folder. Virtual machines are also easy to back up and restore. Because backing up involves only copying a set of files, you can make regular backups at critical phases of any project.