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VCAP5-DCD Objective 2.1 –Map Business Requirements to the Logical Design

Knowledge

  • Explain the common components of logical design.

The common components of a Logical Design are:

  • Focuses on satisfying the design factors (requirements, risks, constraints  assumptions)
  • relationships between all major infrastructure components
  • How to arrange components
  • Does not contain physical detail like ports or ip addresses etc

Image below is an example of a logical design, very simple and clearly shows servers running vSphere running VMs which is all managed by vCenter.

logical-diag-vcenter

  • List the detailed steps that go into the makeup of a common logical design.
    • Step one – Gather information from various sources (stakeholder interviews, current state analysis and any exisiting documentation)
    • Step two – Define Requirements
      • Goals (why and when)
      • Scope (What and what not)
      • Constraints (must have or must not have)
      • Risks (what will stop this from happening)
      • Assumptions (Already have but is not backed by any evidence )
      • Requirements – Functional ( what the system must do )
      • Requirements – Non Functional (behaviour of system)
    • Step three – Determine dependencies (what and who is affected by this project)
    • Step four – Create conceptual design that meets the goals and requirements.
    • Step five – Project approves the above
    • Step Six – Create the Logical Design.
  • Differentiate functional and non-functional requirements for the design.
    • Functional Requirement – What the system or project must do. for example all service desk staff must be able to reboot and console into the virtual machines.
    • Non Functional – also can be considered a constraint that’s been placed on the project by the client. for example – vitrual machine storage must use the existing NetAPP iSCSi storage and have less than 10ms latency.

Skills and Abilities

  • Build non-functional requirements into a specific logical design.

Below I have put in the above non functional design of having to use the existing iSCSI storage.

logical design

  • Translate given business requirements and the current state of a customer environment into a logical design.

Same as above take a business requirement function or non functional and give a high level design. for example the new project needs to take the current site and provide fail-over to a remote site with SAN replication, here we just show how it should work with no details on what technology or how we are going to do it.

logical design 2

  • Create a Service Catalog

A service catalog is introduced from ITIL and should contain the following

  • Service name (Extended Support)
  • Service description (Maintenance and support of servers and components)
  • Services included (Patch management, upgrades, incident support)
  • Services not included (Non-standard changes)
  • Services availability  (24x7x365)

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