In VMware Cloud Foundation (VCF), a workload domain is a logical unit managed by a single vCenter Server and an associated NSX Manager cluster. A key architectural feature of VCF is that a single workload domain can contain multiple vSphere clusters. To add a new vSAN storage cluster without deploying new management components (like another vCenter or NSX instance), the administrator must add it to the existing workload domain. This action leverages the current management plane, directly fulfilling the requirement. Creating a new workload domain would necessitate deploying a new, separate set of management components, violating the stated constraint.

A. Deploy an additional VCF instance and workload domain with a vSAN storage cluster.

This is incorrect because it creates an entirely new VCF environment with its own management components, rather than expanding the existing one.

B. Deploy additional hosts as vSAN storage-only nodes within the existing cluster.

This is incorrect as it only adds capacity to the existing cluster. The task is to deploy a new, separate vSAN Storage Cluster.

D. Deploy an additional workload domain with a vSAN storage cluster within the existing VCF instance.

This is incorrect because creating a new VI workload domain in VCF provisions a new vCenter Server and NSX Manager cluster, which violates the constraint.

1. VMware Cloud Foundation 5.1 Architecture and Deployment Guide:

Section: "Workload Domains in VMware Cloud Foundation"

Content: This section explains that a VI workload domain consists of one or more vSphere clusters managed by a vCenter Server instance. It clarifies that you can scale out a workload domain by adding clusters. This supports the concept of adding a new cluster (Option C) to an existing domain.

2. VMware Cloud Foundation 5.1 Administering VMware Cloud Foundation:

Section: "Clusters in a VI Workload Domain"

Content: "You can add a vSphere cluster to a VI workload domain to scale up its capacity and availability. The new cluster is managed by the vCenter Server instance of the VI workload domain." This directly confirms that adding a cluster to an existing workload domain uses the existing management components

validating Option C and invalidating Option D.

3. VMware Cloud Foundation 5.1 Administering VMware Cloud Foundation:

Section: "Creating a VI Workload Domain"

Content: The procedure for creating a VI workload domain explicitly details the deployment of a new vCenter Server and NSX appliance cluster for that domain. This confirms that Option D

creating a new workload domain

would introduce new management components.