VMware Cloud Foundation (VCF) 5.2 offers various architecture models (Consolidated, Standard) and topologies (Single/Multiple Instance, Single/Multiple Availability Zones) to meet different requirements. The client’s needs—high security, isolation, six vSAN-ready nodes, and no additional budget—guide the architect’s choice. Let’s evaluate each option:
Option A: Single Instance - Multiple Availability Zone Standard architecture model
This model uses a single VCF instance with separate Management and VI Workload Domains across multiple availability zones (AZs) for resilience. It requires at least four nodes per AZ (minimum for vSAN HA), meaning six nodes are insufficient for two AZs (eight nodes minimum). It also increases complexity and doesn’t inherently enhance isolation from other infrastructures. This option is impractical given the node constraint.
Option B: Single Instance Consolidated architecture model
The Consolidated model runs management and workload components on a single cluster (minimum four nodes, up to eight typically). With six nodes, this is feasible and capacity-efficient, but it compromises isolation because management and user workloads share the same infrastructure. For a “highly secure” and “isolated” project, mixing workloads increases the attack surface and risks compliance, making this less suitable despite fitting the node count.
Option C: Single Instance - Single Availability Zone Standard architecture model
This is the correct answer. The Standard model separates management (minimum four nodes) and VI Workload Domains (minimum three nodes, but often four for HA) within a single VCF instance and AZ. With six nodes, the architect can allocate four to the Management Domain and two to a VI Workload Domain (or adjust based on capacity). A single AZ fits the budget constraint (no extra nodes), and isolation is achieved by dedicating the VCF instance to this project, separate from other infrastructures. The high-density vSAN nodes support both domains, and security is enhanced by logical separation of management and workloads, aligning with VCF 5.2 best practices for secure deployments.
Option D: Multiple Instance - Single Availability Zone Standard architecture model
Multiple VCF instances (e.g., one for management, one for workloads) in a single AZ require separate node pools, each with a minimum of four nodes for vSAN. Six nodes cannot support two instances (eight nodes minimum), making this option unfeasible given the budget and hardware constraints.
Conclusion:TheSingle Instance - Single Availability Zone Standard architecture model(Option C) is the best fit. It uses six nodes efficiently (e.g., four for Management, two for Workload), ensures isolation by dedicating the instance to the project, and meets security needs through logical separation, all within the budget limitation.
References:
VMware Cloud Foundation 5.2 Architecture and Deployment Guide (Section: Architecture Models and Topologies)
VMware Cloud Foundation 5.2 Planning and Preparation Guide (Section: Sizing and Isolation Considerations)
