The differences between private clouds and IaaS were touched on earlier, but it is worth revisiting the concept now that each separate product has been more clearly defined. One of the most important differences to understand between private cloud products and IaaS solutions is control.
With an IaaS solution, you maintain responsibility for a lot of issues involved in computing while surrendering some of the important factors. A cloud vendor is responsible for servers, virtualization (such as virtual machines), data storage and security, and networking (capacity, speed, reliability, etc.). You are still responsible for factors such as applications, runtimes, security and integration with on-site systems, and databases. This can become a real problem if a public cloud vendor cannot guarantee reliable uptime, suffers numerous security breaches, or over-extends its computing resources across numerous customers resulting in poor performance for your applications.
Conversely, a private cloud provides your company with a greater sense of control over more of your cloud computing resources and cloud environment. A private cloud is as close to infinitely customizable as you will get in cloud computing. You can choose the amount of storage space, server capacity, and network bandwidth needed for ideal infrastructure performance, and you also get a say in the software setup on your network, the nature of virtualization, and the security measures imposed on your cloud computing system.
Moreover, you not only have control over how your network looks, but in some cases you can opt to take control over certain aspects of the cloud environment. This gives a better sense of security for data and operations, as well as improved access for your employees.