VMware vSAN: Plan and Deploy [V7] — Lesson 3: Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom

Learning Objectives

• Translate a realistic infrastructure or application requirement into an executable approach for Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom.
• Use capacity model and policy-to-workload mapping to verify configuration, connectivity, security, and expected behavior.
• Explain how to recover safely when a usable-capacity estimate omitting object overhead and expected growth occurs.

Detailed Topics

• Capacity modeling
• Slack space
• Failures to tolerate
• RAID choices
• Object overhead
• Resynchronization reserve
• Storage policies
• Encryption
• And operational headroom
• Decision ownership, prerequisites, and acceptance evidence for Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom
• Relevant access, security, capacity, dependency, performance, recovery, and support considerations

Instructor Demonstration

The instructor builds a representative scenario for Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom, narrating each decision and showing how it contributes to a defensible vSAN 7 plan and deployment that translates workload requirements into compatible hardware, network, capacity, availability, policy, and rollout decisions. The demonstration records capacity model and policy-to-workload mapping so learners can compare design intent with observable behavior.

Hands-On Exercise

Configure and test Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom with representative infrastructure or application data. Use “a usable-capacity estimate omitting object overhead and expected growth” as the troubleshooting challenge, compare hypotheses, retest the affected path, and complete capacity model and policy-to-workload mapping for review.

1. Define the requirement and identify dependencies before changing the environment.
2. Create a baseline result that can be compared with later changes.
3. Reproduce the exception and test one hypothesis at a time.
4. Complete the evidence record and obtain peer or instructor review.

Scenario Analysis

• Clarify the service trigger, affected components and roles, prerequisites, and acceptable result for Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom.
• Compare at least two implementation or correction choices and identify which evidence would distinguish them.
• Decide how capacity model and policy-to-workload mapping should be reviewed, approved, retained, and handed to the next owner.

Troubleshooting Guidance

Avoid changing multiple settings at once while troubleshooting Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom. Preserve the failing example, review capacity model and policy-to-workload mapping, and verify whether “a usable-capacity estimate omitting object overhead and expected growth” is the root cause. After remediation, confirm downstream effects and add a monitoring action.

Validation Checklist

• The scope of Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom is clear, including what is deliberately excluded from the test.
• Evidence in capacity model and policy-to-workload mapping supports each material decision and outcome.
• A negative test demonstrates that controls reject or expose an invalid condition.
• Open risks, owners, due actions, and production safeguards are documented.

Lesson Outcome

Learners can apply Capacity modeling, slack space, failures to tolerate, RAID choices, object overhead, resynchronization reserve, storage policies, encryption, and operational headroom, explain the decisions made, and defend the result with capacity model and policy-to-workload mapping.