The migration to server virtualization and the evolution to private clouds require agile workload provisioning and large virtualized server resource pools for workload mobility. Traditional network solutions will inhibit private clouds if network architects are unable to meet these requirements.
The introduction of server virtualization, dynamic server resource management via VM mobility and the emergence of private cloud solutions are, at best, difficult to manage with traditional network solutions. Server Virtualization has already been the source of the most significant impacts on the data center network in recent time, but it is only the starting point. As outlined in "The Road Map From Virtualization to Cloud Computing," server administrators typically introduce server virtualization to cost optimize their compute resources. Virtualization creates a pool of manageable and flexible server capacity that makes it possible to optimize resource utilization by moving workloads between physical resources. The management of this server resource pool can be highly automated, and thus become an enabler of agile private cloud solutions.
The key problem for network architects is that existing data center networks can't easily support the evolution to such private cloud solutions, especially in three key areas: