LUN reached a thin provisioning warning

I continue to get this error on my Xenservers on a newly provsioned 500GB LUN. I have thin provisioning enabled and have checked the VAAI option. I've tried setting it to 5%, 95% and leaving it blank, I still get the error. Running 11.2 U4.1

There's plenty of free space, I have 2 volume groups and it does this for LUNs on both of them.