What is the key benefit of a vSphere cluster?

A vSphere cluster provides significant advantages in terms of high availability and resource optimization, which is why this option is the correct answer. When multiple hosts are grouped into a cluster, vSphere can leverage features such as Distributed Resource Scheduler (DRS) and High Availability (HA).

High Availability ensures that virtual machines (VMs) remain operational even in the event of a host failure. If a host goes down, VMs running on that host are automatically restarted on another available host in the cluster, thereby minimizing downtime and improving resilience.

Resource optimization is achieved through DRS, which dynamically balances workloads across the cluster by distributing resources based on demand. This ensures that all VMs receive the necessary resources to perform efficiently, preventing scenarios where some hosts are overutilized while others are underutilized.

In contrast, although increased disk space, improved hardware compatibility, and enhanced user interfaces may contribute to the overall performance and usability of the environment, they do not capture the core functional benefits that a vSphere cluster is designed to provide. The focus of clustering is primarily on ensuring availability and efficient resource management, making it a powerful tool for maintaining operational continuity and performance in a virtualized environment.