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HA Advanced Settings
Below are some of the Advanced HA Settings you can find on vSphere 5 and prior Please note that each bullet details the version which supports this advanced setting: das.maskCleanShutdownEnabled – 5.0...
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Can you have VMware hosts with different amounts of RAM?
Yes you can have hosts with different amounts of RAM in a cluster. HA will work ok as long as one host doesn’t have less RAM than an actual VM needs as a reservation For example: If you have 3 hosts...
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Configure HA Redundancy
HA in vSphere 5 The way HA works in vSphere 5 is quite different to the way it worked in vSphere 4. vSphere HA now uses a new tool called FDM (Fault Domain Manager) which has been developed to replace...
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Configure customised isolation response settings
HA Isolation Responses As seen in the below diagram, when HA detects a failure on one of the hosts, a response is triggered to deal with the Virtual Machines on that host Host Isolation Responses First...
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Configure HA Related alarms and monitor a HA Cluster
Monitoring a cluster Highlight the cluster Select Summary You will see the following page Click Advanced Runtime. This tells you the current state of your cluster including the slot information and...
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Understand interactions between DRS and HA
Using vSphere HA and DRS Together Using vSphere HA with Distributed Resource Scheduler (DRS) combines automatic failover with load balancing. This combination can result in a more balanced cluster...
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Analyze vSphere environment to determine appropriate HA admission control policy
Choosing an Admission Control Policy You should choose a vSphere HA admission control policy based on your availability needs and the characteristics of your cluster. When choosing an admission...
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Analyse performance metrics to calculate host failure requirements
Performance Metrics to use Use the inbuilt vCenter Performance charts The vCenter Performance charts have 3 advanced settings which allow you to see Effective CPU Resources, Effective Memory Resources...
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Analyze HA cluster capacity to determine optimum cluster size
Cluster Capacity Recommendations How many hosts do you have How many VMs do you have Do you have reservations on your VMs Remember the limit of 32 hosts per cluster Do you have Oracle clustering...
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HA in VMware vSphere 5.x – What actually happens?
The HA Question? We were asked what actually happens to the hosts and VMs in vSphere 5.5 if an isolation event was triggered and we completely lost our host Management Network. (Which I have seen...
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