VMFS5 is a new version of the VMware cluster file system that provides performance and scalability improvements.


  • Open a vSphere Client connection to a vCenter Server.
  • If you use a VMFS2 datastore, you must first upgrade it to VMFS3. Follow the instructions in Upgrade VMFS2 Datastores to VMFS3.
  • All hosts accessing the datastore must support VMFS5.
  • Verify that the volume to be upgraded has at least 2MB of free blocks available and 1 free file descriptor.


  1. Log in to the vSphere Client, and select a host from the inventory panel.
  2. Click the Configuration tab and click Storage.
  3. Select the VMFS3 datastore.
  4. Click Upgrade to VMFS5.
    A warning message about host version support appears.
  5. Click OK to start the upgrade.

    The task Upgrade VMFS appears in the Recent Tasks list.

  6. Perform a rescan on all hosts that are associated with the datastore.