What impact does server virtualization have on resource allocation?

Server virtualization significantly enhances resource allocation by creating isolated environments for multiple virtual machines (VMs) on a single physical server. This technology enables better utilization of hardware resources, as it allows several operating systems to run concurrently on a single physical server while maintaining their independence. Each VM operates as if it were a separate physical machine, enabling efficient management of resources such as CPU, memory, and storage.

This improved allocation leads to better performance and scalability, as resources can be dynamically adjusted based on the needs of each isolated environment. It optimizes hardware usage, reduces costs associated with physical servers, and increases the flexibility to deploy and manage applications in the data center.

The other answers do not align with the benefits of virtualization. For instance, the mention of restrictions on resource access does not consider how virtualization actually improves access and sharing among VMs. Only allowing a single operating system per server contradicts the fundamental concept of virtualization, which is to enable multiple systems. Lastly, the idea that it increases the need for physical servers is misaligned with the reality that virtualization often reduces the overall physical server requirement by maximizing the potential of existing servers.