How to setup fake raid for vmware virtual machines?
ESXi is not supporting fake raid. You need to create 2 VMFS and add 2 disk each on one of the data stores and setup software RAID on the guest OS. You will have redundancy for VM, but not for ESX itself.
You should use supported hardware. Fakeraid solutions aren't in the scope of VMWare ESXi blessed setup. You can make things work by acquiring a hardware RAID controller from the VMWare Hardware Compatibility List, though.