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.