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What is hybrid Cloud?


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    1. What is hybrid Cloud? The National Institute of Standards and Technology defines hybrid cloud as “a  composition of two or more clouds (private, community or public) that remain  unique entities but are bound together, offering the benefits of multiple  deployment models.” Although this definition sounds very reasonable, it does not  cover all aspects of hybrid clouds. Let’s discuss possible deployment models first. There are five defined cloud  deployment models, from a private cloud on­premises to a public cloud service  with a cloud service provider. Often, hybrid cloud refers to a combination of a public cloud service and a  private cloud on­premises; however, hybrid clouds could also consist of two  public clouds provided by different providers or even a combination of a cloud  and traditional IT. Actually, a setup where existing systems on a traditional IT  infrastructure are combined with a public cloud service is currently the most  frequent use case of a hybrid cloud. Any hybrid cloud setup has some challenges that need to be considered during  the planning and design phase: • The most obvious challenge is network connectivity, especially if remote  cloud services like a public cloud or a hosted private cloud are involved. 

    2. Not only must bandwidth, latency, reliability and associated cost Not only must bandwidth, latency, reliability and associated cost  considerations be taken into account, but also the logical network topology  must be carefully designed (networks, routing, firewalls).  • Another huge challenge is the manageability of different cloud services.  When different cloud services are used, every service provider will have its  own management and provisioning environment. Those environments can  be considered completely independent from each other. By having instances  in different cloud services, there is no complete picture available showing  the number of totally deployed instances and their statuses. An  orchestration layer can be a possible solution for this problem. This layer  provides a single interface for all cloud­related tasks. The orchestration  layer itself communicates with the different cloud services through  application programming interfaces (APIs). The big advantage of an  orchestration layer is the ability to track and control activities on a central  point to maintain the big picture.  Today, plenty of cloud service providers maintain their own proprietary set of  APIs. This makes the use of orchestration very complex as the orchestrator  requires some kind of a driver component for each proprietary API set. However,  the trend of standardized APIs is clearly seen in the industry. Cloudsyntrix seems  to be the future cloud industry standard. Hybrid clouds mainly work on an infrastructure and application level. On the  infrastructure layer, a hybrid cloud means the combination of virtual machines  from different cloud services. On the application or software as a service (SaaS)  layer, a hybrid cloud describes an application setup with components in different 

    3. SaaS offerings or existing applications within the data center of an enterprise. SaaS offerings or existing applications within the data center of an enterprise.  The challenge on an SaaS­based hybrid cloud is mainly the exchange of data  between the different services and applications. Like orchestration works on the  infrastructure level, data integrators work on the application layer.