Search the VMware Knowledge Base (KB)
View by Article ID

Changes to VMware High Availability in vSphere 4.1 (1022843)

  • 2 Ratings


This article provides information about the changes to VMware High Availability (HA) in vSphere 4.1.


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.


HA in vSphere 4.1 has these limitations:
  • 320 virtual machines per host
  • 3,000 virtual machines per cluster
  • 32 host clusters

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


  • 2 Ratings

Did this article help you?
This article resolved my issue.
This article did not resolve my issue.
This article helped but additional information was required to resolve my issue.

What can we do to improve this information? (4000 or fewer characters)

Please enter the Captcha code before clicking Submit.
  • 2 Ratings