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Changes to VMware High Availability in vSphere 4.1
Purpose
This article provides information about the changes to VMware High Availability (HA) in vSphere 4.1.
Resolution
What's new?
HA calculates normalized shares for a virtual machine when it is powered on after an isolation event. Prior to vSphere 4.1, an HA failed over virtual machine can be granted more resource shares than it should be causing resource starvation until DRS balances the load.
In vSphere 4.1, before powering up a failed over virtual machine, the capacity for the virtual machine resources are assigned temporarily until the resources become available. They are then deleted and the failed over virtual machine powers up on the host that has the capacity for the virtual machine.
Limitations
HA in vSphere 4.1 has these limitations:
320 virtual machines per host
3,000 virtual machines per cluster
32 host clusters
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