I just had to remedy something like this myself. If it's not already working, it may be helpful to see if you can schedule downtime to get vMotion working. Otherwise, it may just be worth your while to switch to a new boot drive and do a new install of ESXi from scratch. Get a vCenter up and running as a virtual appliance, or not (to reduce downtime you can build the vCenter on a notebook with workstation and then upload it), then import in your hosts and VMs. It may seem radical as an approach, but it removes all the unknowns and uncertainties from your setup. Also, you may end up fixing your problem along with others you have not found yet, and get some bonus points for swinging and upgrade at the same time. If you can't install another array or attach more storage, do a quick install to a thumbdrive and boot from USB - image a few USB drives, but you only need them connected at boot time.
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