Hello StreaqS, The only way to do your setup & have your data stay intact with no corruption is to put both physical systems in a cluster. Without having a cluster in place as soon as you connect the second physical host to the virtual disk it will corrupt your data.   Please let us know if you have any other questions.  
Does anyone know of a way to run an MD1200 array in unified mode with a shared volume between 2 physical systems? The goal is to access the array simultaneously from 2 different systems with each system seeing the changes of the other one. I know it wasn't necessarily designed for this, but i thought i heard someone say it could be done. Any thoughts on this?
MD1200 unified mode with 2 systems - shared volume