My ramblings about all things technical

VCAP5-DCA: Objective 4.1

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Implement and Maintain Complex VMware HA Solutions

There isn’t much that is different for this over what was in the VCAP4-DCA Blueprint objective. I’ve been watching the HA videos from the Trainsignal VMware vSphere 5 Training course and the vSphere 5 Clustering Tech Deepdive book by Frank Denneman and Duncan Epping. Due to HA and DRS being revamped for vSphere 5 I think the book covers it all perfectly and more. Duncan also did a blog posting covering HA here: (it’s a serious deepdive)


  • Identify the three admission control policies for HA
  • Identify heartbeat options and dependencies

Skills and Abilities

  • Calculate host failure requirements
  • Configure customized isolation response settings
  • Configure HA redundancy

Management Network – Simply down to setting two management connections/vmkernel ports

Datastore Heartbeat – this is new to vSphere 5 and is therefore something new to this objective. I’ve learnt it via the clustering tech deepdive book and from this blog posting by Duncan It is also covered in the trainsignal videos and is something you should know from your VCP5 studies

Network partitions – This is also new and is covered in the book and the deepdive posting. I also learnt how to fix it should a host alert that it is network partitioned as I think this could be a task and so I learnt this kb article it is also covered here

  • Configure HA related alarms and monitor an HA cluster
  • Create a custom slot size configuration
  • Understand interactions between DRS and HA
  • Analyze vSphere environment to determine appropriate HA admission control policy
  • Analyze performance metrics to calculate host failure requirements
  • Analyze Virtual Machine workload to determine optimum slot size
  • Analyze HA cluster capacity to determine optimum cluster size

Due to objective 3 having DRS as objective 3.3 and this objective being about HA it has worked in well that I have been re-reading the vSphere 5 Clustering Tech Deepdive book as it covers both of these 100%. All that you need to do now is practice doing it all in your lab



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