For example, you may bless each VM with two vCPU cores because of vague attitudes like “Hey, multitasking is important” or “Well, performance surely will be horrible with a single core-it ain’t 2003 anymore!” Even when the server is designed solely for virtualization purposes, it may not be necessary to give every VM more oomph than it really needs, specifically when it comes to CPU resources. You just gleefully unboxed your shiny new 32-core server rack equipped with near-infinite amounts of RAM. (My examples primarily use Windows but are equally applicable to virtualization on Linux.) No. Let’s identify the common mistakes and how to avoid them. Complexity always means an increased potential for errors, both in practical terms and mistakes at the conceptual level. Yet the Matryoshka doll principle of having something sit inside another thing (and maybe sit inside yet another thing, as with nested virtualization) makes some computing tasks more complex. On one front, virtualization makes your life easier. Virtualization is used on client PCs, servers, and clouds as well as in seemingly unrelated technologies such as gaming emulation, which is, in essence, just another form of virtualization. Making one system work on another system likely will always be a requirement in our industry. Although we often discuss virtualization as a new thing, the need for the technology is almost as old as computing itself, dating back to the 1960s.

What happens when you run out of ram