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vSAN Health Service - Witness host within vCenter cluster (2130587)

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The Witness host within vCenter cluster check in the vSAN Health Service verifies that the witness host is a standalone host, and not part of the vSAN-enabled cluster. If this health check is not green (OK), the stretched cluster has configuration issues that affect its operation.

If the witness host resides within a vSAN-enabled cluster, it causes problems with vSphere DRS, HA, and EVC. The witness host must not be a member of any vSAN-enabled vCenter cluster.


To resolve the error state:
  1. Place the witness host in Maintenance Mode, with No Data Migration as the evacuation mode.  
  2. In the Web Client Hosts and Clusters view, drag the witness host out of the vSAN cluster but within the parent data center.
  3. Exit Maintenance Mode on the witness host.
  4. Under Fault Domains (Manage > Settings), remove the witness host from the cluster, then add it back to the cluster.

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