If you use VMFS3 datastores, you must upgrade them to VMFS5.

You can perform an upgrade while the datastore is in use with virtual machines powered on.


  • If you have a VMFS2 datastore, you must first upgrade it to VMFS3 using an ESX/ESXi 3.x or ESX/ESXi 4.x host. Use the vSphere Host Client to access the host.
  • All hosts accessing the datastore must support VMFS5.
  • Verify that the volume to be upgraded has at least 2 MB of free space. Check the datastore Summary tab for this information.


  1. In the vSphere Web Client navigator, select Global Inventory Lists > Datastores.
  2. Click the datastore to upgrade.
  3. Click the Configure tab.
  4. Click Upgrade to VMFS5.
  5. Verify that the hosts accessing the datastore support VMFS5.
  6. Click OK to start the upgrade.
  7. 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.