Can I assume that the RAID controller detected the disks correctly, and the RAID set is healthy?
What you may try in this case, is to see whether you can mount the VMFS datastore manually by following the steps in the "Command line" section in https://kb.vmware.com/kb/1011387
If you need help with recovering inaccessible VMs, don't try to many things on your own. Rather try to contact continuum, who's a specialist in data recovery.
André