Upgrade the vSAN disk format on AMP-VX cluster

About this task

Upgrade the AMP-VX cluster up in the following sequence:
  1. VMware vCenter Server.
  2. VMware ESXi hosts.
  3. vSAN disk format.
CAUTION: Failure to follow the sequence of upgrade tasks leads to data loss and cluster failure.

Before you begin

  • Ensure you have a full backup of all data stored on the vSAN before upgrading.
  • The disk groups are upgraded one at a time. For each disk group upgrade, all data from each device is evacuated and the disk group is removed from the vSAN cluster. The disk group is then added back to vSAN with the new on-disk format.
  • Ensure that enough free space is available. The space available must equal the logical consumed capacity of the largest disk group. You need a separate disk group with the available capacity from the one you are migrating.
  • WARNING: While the upgrade is in progress, do not remove or disconnect any host, and do not place a host in maintenance mode. When any member host of a vSAN cluster enters maintenance mode, the member host no longer contributes capacity to the cluster. The cluster capacity is reduced and the cluster upgrade might fail.
  • Verify that the disks are in a healthy state. Navigate to the Disk Management page to verify the object status.
NOTE: Once you upgrade the on-disk format, you cannot roll back software on the hosts or add certain older hosts to the cluster.


  1. Navigate to the vSAN cluster.
  2. Select the Configure tab.
  3. Under vSAN, select Disk Management.
  4. Click Pre-check Upgrade.

    The upgrade precheck analyzes the cluster to uncover any issues that might prevent a successful upgrade. Some of the items that are checked are host status, disk status, network status, and object status. Upgrade issues are displayed in the Disk pre-check status text box.

  5. Click Upgrade.
  6. On the Upgrade dialog box, ensure Allow Reduced Redundancy is cleared, and then Click Yes to perform the upgrade of the on-disk format.