No documentation that I could find. To get it working I had to solve a few puzzles. How to make NVRam persist accross reboots, how to get 2 VMs shared access to the simdisks, and how to get NVRam mirroring working accross nodes. More accurately, I had to figure out how they solved them. Ultimately it involved moving the simdisks to an nfs share, a number of settings in the vloader, and using the VMCI bus to simulate RDMA. Its a complex config, and it only works on certain versions of VMware.