Take a look at the following link:https://www.experts-exchange.com/questions/27032673/VMware-wants-to-format-an-existing-VMFS.html
May be a signature issue with the LUN. Good luck.
Take a look at the following link:https://www.experts-exchange.com/questions/27032673/VMware-wants-to-format-an-existing-VMFS.html
May be a signature issue with the LUN. Good luck.