Clarification on differing disk space in nodes when using Ubuntu Cloud

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http://askubuntu.com – I'm thinking about setting up a private cloud using Ubuntu with 2 nodes, but I don't quite understand how disk space from each node is handled in the cloud. Can somebody explain how (and if) the disk space is accessible in the cloud when I have 2 nodes with varying amount of disk space, for example 320GB and 1TB? edit for clarification: Currently I have 3 Windows Servers, consisting of a Domain Controller, a Database-/File-Server and a Web-/Mail-Server. I want to switch to an Ubuntu Server-based private cloud using VMs instead of dedicating each physical server to a certain job. As my datab (HowTos)