I wonder if the xleases volume mentioned here refers to ovf_store ?
* A new xleases volume to support VM leases - this feature adds the
ability to acquire a lease per virtual machine on shared storage without
attaching the lease to a virtual machine disk.
A VM lease offers two important capabilities:
* Avoiding split-brain.
* Starting a VM on another host if the original host becomes
non-responsive, which improves the availability of HA VMs.