Which step is necessary for implementing VMware vSAN?

Selecting eligible disks on each host is a crucial step in implementing VMware vSAN because vSAN is designed to use local storage resources on each host to create a unified storage pool. By designating the appropriate disks, which can include SSDs and HDDs, for the vSAN datastore, administrators ensure that the system has the necessary resources to provide high performance and redundancy for virtual machines.

When implementing vSAN, it's essential to understand that the disks selected need to fulfill specific requirements, such as being in the correct configurations (e.g., capacity tier and caching tier), and being compatible with vSAN. The eligibility of the disks is determined by their availability and characteristics, which are necessary for vSAN to function optimally and support the desired storage policies.

Networking and additional hardware can be important in a broader vSAN setup, but the immediate requirement is selecting the right disks that will participate in the vSAN environment. Configuring network settings is relevant but typically follows after the initial storage setup, and creating snapshots is not part of the vSAN implementation process. Thus, focusing on the disks available on each host is essential as a foundational step in setting up VMware vSAN.