In the end I found that my RAID controller (Adaptec 5805) allows me to create multiple LUNs against the same RAID array. This way I could partition my RAID array into smaller ones (<=2TB).

Please note that you still have to delete and re-create them in ESXi because ESXi once again assigns a smaller block size to them during install.

I also found that even though you can only assign 2TB to a virtual machine at build time, you can later on assign additional hard drives to increase your available disk space. Furthermore, if you are using Windows, you can merge these drives into a dynamic disk in windows.

Cheers,

Jens