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.