After you mount the VMFS3 datastore that failed to upgrade automatically, upgrade it to VMFS5.
- Navigate to the VMFS3 datastore.
- Select Upgrade to VMFS5 from the right-click menu.
- Verify that the hosts accessing the datastore support VMFS5.
- Click OK to start the upgrade.
- Perform a rescan on all hosts that are associated with the datastore.
The datastore is upgraded to VMFS5 and is available to all hosts that are associated with the datastore.