VM Rightsizing

What Does VM Rightsizing Mean?

VM rightsizing is an administrative process wherein system administrators optimize the allocation of resources within a virtualized hardware environment.


Techopedia Explains VM Rightsizing

In general, virtual systems are set up to be as efficient as possible. However, common problems with the operation of virtual systems arise over time. Individual virtual machines (VMs) are supposed to have the right levels of processing power, memory and disk space. Sometimes, though, they do not use what has been allocated to them, which results in inefficiency.

In VM rightsizing, system administrators assess the virtual CPU processing power allocated to a VM. They also look at the assigned RAM and virtual disk space, and what the VM uses.

Although administrators can use manual VM rightsizing, there are software tools available that provide this kind of administration. These tools can either suggest manual pre-provisioning of resources or, in some cases, change the provisioning automatically. All of these strategies are subject to hardware and software requirements, and must work with administrative schedulers and other software tools that support ongoing operations.


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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.