You can replace or change the vSAN witness host for a stretched cluster using the vSphere Client without affecting life cycle operations of SDDC Manager.

Prerequisites

Verify that the vSAN witness host is not in use by another cluster, has a VMkernel configured for vSAN traffic, and has no vSAN partitions on its disks.

Procedure

  1. In a web browser, log in to vCenter Server at https://vcenter_server_fqdn/ui.
  2. Select Menu > Hosts and Clusters.
  3. In the inventory panel, expand vCenter Server > Datacenter.
  4. Select the stretched cluster and click Configure.
  5. Under vSAN, click Fault Domains.
    The vSAN menu options showing Fault Domains.
  6. Click the Change button.
  7. Select a new host to use as the vSAN witness host and click Next.
  8. Claim disks on the new witness host and click Next.
  9. Review the configuration and click Finish.