VMware ESX to GSX

I finished the loop today of moving VMware virtual machines between GSX and ESX server and back again. Yesterday I created a vmachine on GSX server and moved it successfully to ESX server. Today I reversed the process, converting an ESX server vmachine to GSX server.

Aside from the necessity of maintaining the same virtual scsi subsystem throughout, it worked like a charm. I did find out that if you create the vmachine with a virtual LSI SCSI subsystem and then later accidentally switch it to Buslogic, you get an endless Boot/Bluescreen/Reboot loop in the virtual machine. If you start with LSI SCSI on GSX server, move the machine to ESX and back maintaining LSI SCSI the whole time, it all just works.