I've got 2 nodes with about 5TB capacity on each. Is it recommended to use all the available space to create the mirrored volume or should I keep some for the individual hosts. If we are going to run Starwind then we would want all available VM's to be HA so I would think we would use all the space....

This was the question that my manager asked me when we were speccing out our VSAN setup. We currently have two hosts with about 10TB of raw storage on each. With RAID10 we are halving our usable space by mirroring. Then we are duplicating this data on the other host. Why not use RAID0 on each server...