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Cons to the private clouds

In spite of many organizations wishing to have a private cloud performing for their internal needs, providing them with all resources necessary for their everyday work, most of them does not have the comfort to be able to rebuild the necessary infrastructure.

In turn, large organizations make significant investments for maintaining the existing applications and infrastructure they wish to become more agile and efficient.
In both cases, to conduct such radical changes like creating a private cloud, takes something more than just servers virtualization, because many of the key applications are actually complex, hardwired structures of business logic, middleware and hardware.  
To achieve the promised agility of cloud computing, the private cloud services must be dynamically deployed and scaled upon end users’ requests, without human intervention. There are of course many tools, which assure some level of automation. But there is no use assigning, provisioning, configuring and reconfiguring across a disconnected pool of automation – for virtual and physical servers, storage, applications and nets across different providers’ platforms, because it would mean arranging too many efforts into one operation.  
Creating a private cloud, most organizations base exclusively on the infrastructure they already have. Many of them are building parallel bets, where new applications and services can take advantage of the architecture created especially for them and designed from the ground for the needs of the newly created dynamic cloud environment.  
In case of on-premise private clouds, it means that services must be developed from the outset for dynamic provisioning and scaling. This is because, to date, the processes of application development and operations have been largely disconnected and lacked a common environment, covering the processes of assembling and provisioning as well as business logic, load balancing and data storage.