Our plans

The whole idea is to use Eucalyptus as the software to power our private cloud. Eucalyptus is composed of Node Controllers (NC), Cluster Controllers (CC) and a Cloud Controller (CLC). There is also a Storage Controller called Walrus, but I'm not sure yet how that one is supposed to work.

Node Controllers are to be installed in host nodes running a hypervisor. The nodes will host virtual machines.

A Cluster Controller is installed in the head of a cluster to work as an intermediary between the Cloud Controller and the Node Controllers and probably to do some additional management of the host nodes.

The Cloud Controller provides the front-end that registered users can use to create virtual machines.

Walrus? Somebody please enlighten me. =)

EDIT:
It seems there is an additional controller associated to Walrus: the Storage Controller (SC).

EDITED by Lucio:

Here are links to the tools that we are planning to use to build our cloud:

Eucalyptus

Xen