IPexpert just released its Volume 1 Workbook for new CCIE Voice Blueprint. I installed UCM 7 in VMWare workstation. Here’s the custom settings that I used VMWare 6, 73 GB with SCSI Controller, Red Hat Enterprise 4.0 and 2048 MB RAM.
Pre-allocation of hard disk space will improve performance, its good recommendation but no compulsory if you are running out of space. You can also bump down the RAM after installation to 1024 MB which will of course effect performance but will save your resources. I will post video with step by step instructions soon.