Change the vSAN Witness Host in a Stretched Cluster

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.
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.
  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
    .
  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
    .