Considerations For Running Multiple Virtual Machines Part II

If you are running a single virtual machine on your host, you do not have to be too concerned about the virtual machine settings. It is when you get into a multiple virtual machine configuration that you need to start thinking about them because some of the settings can affect all the virtual machines running on a host, not just one. So let’s take a look at some of the settings you need to pay close attention to.

File Name
When you create a new virtual machine, you are prompted to provide a file name. This is the name assigned to the virtual machine configuration (.vmc) file. This file name can not exceed 150 characters and if you are running multiple virtual machines, each one must have a unique file name.

CPU Resource Allocation
You need to pay close attention to the CPU Resource Allocation settings when running multiple virtual machines. For example, if one of your virtual machines will not start, it may be due to over-allocated CPU resources. In other words, some virtual machines have been assigned more CPU resources than others.

Since only those virtual machines that you have permissions to appear on the CPU Resource Allocation page, it is easy for someone to mistakenly over-allocate CPU resources to the virtual machines listed. This can prevent other virtual machines from turning on or affect the performance of virtual machines running in the background.

Virtual Hard Disks
Each virtual machine uses a virtual hard disk (vhd file). This is where a virtual machine will store files and install programs – the same way that the host operating system uses a physical hard disk. When you are running multiple virtual machines on a host remember that a virtual hard disk can only be used by one virtual machine at a time. Therefore if you plan to run two virtual machines simultaneously, you will require two virtual hard disks.

[tags]virtual machine, networking[/tags]

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