Below is the link for ESX 3.5 maximum configurations - looks as though they do not support over 2TB in size. Also we do not have a function to decreases the size of the logical Volumes only to increase them. I was thinking of replicating the your Target to another system with our Demo-CD but not sure if you would have to initialize the Target then disable the Target then replicate from the Source (being the different volumes size), once complete enable the Destination as Source and enable the Target. But never done this before.