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vSphere High Availability (HA) fails to restart a virtual machine when VMware vSAN network is partitioned (2073949)

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Symptoms

When a VMware vSAN network is partitioned, you may experience these symptoms:
  • vSphere High Availability (HA) fails to restart virtual machines protected by HA
  • vSphere High Availability (HA) cannot restart virtual machines protected by HA
  • Virtual machines do not power on as expected

Cause

This issue occurs when vSAN uses VMkernel adapters for internode communication, which are on the same subnet as other VMkernel adapters in a cluster. Such a configuration can cause network failure and disrupt vSAN internode communication, while vSphere HA internode communication remains unaffected.

In this situation, the HA master agent may detect the failure in a virtual machine, but is unable to restart it. For example, this can occur when the host on which the master agent is running does not have access to the virtual machine objects.

Resolution

This is a known issue affecting VMware vSAN 5.5 and VMware vSAN 6.0.

To work around this issue, ensure the VMkernel adapters used by vSAN do not share a subnet with the VMkernel adapters used for other purposes.

Note: It is recommended to set the HA isolation response to Power Off for virtual machines protected by HA on a  vSAN datastore.

Additional Information

For more information, see:
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Update History

03/12/2015 - Added vSAN 6.0 to Products.

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