I'm going to use XEN for the first time to virtualise an OES2 Linux server and Lotus server.

If I run them as a Para VM, is there anything I need to configure differently or is it just install and configure the guest OS as you would a physical?

Also as I'm noob to XEN with disk space allocation, do the guest VM's use unallocated space or do I allocate it all to the host OS and they use that space? For example, my server will have 3TB (after raid). To start with I want to give my OES2 guest 1.5TB and lotus 500GB. Later down the track I will assign the leftover space as needed. How would I do this?