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Introductie Windows Server 2016

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11 C H A P T E R 1 | The software-defined datacenter IT strives above all for stability. That's because the key business expectation of IT is that applications and services just work. To achieve such stability, IT relies heavily on control. To that end, many of the policies and procedures that IT puts into place are designed to control the environment. Business, on the other hand, strives above all else for growth. Because the marketplace constantly changes, businesses need to be flexible and agile so that they can quickly evolve in response to changing economic conditions. This puts tremendous stress on traditional IT processes, which by design change slowly to maintain stability. Business says, "We need X to grow, and we need it now!" IT responds, "Wait! We'll need to test this and introduce it slowly to make sure it doesn't upset things." As a result, business is frustrated and tries an end-run around IT by implementing what's known as shadow IT—IT solutions implemented without the blessing or knowledge of the IT department. Of course, shadow IT has been around for as long as computers have been affordable and readily available for businesses. Copying company data onto removable storage to take home is an example of end users doing an end-run around the controls IT puts in place to safeguard sensitive business information. The endless proliferation of Microsoft SharePoint sites can also be considered a form of shadow IT because such sites are usually self-provisioned without any oversight from the IT department. Other examples of shadow IT range from setting up unauthorized Wi-Fi access points to deploying entire Active Directory domains of PCs with their own DHCP servers. And then there's the cloud. One can argue that the main driver behind business units surreptitiously signing up for cloud services with a public or hosted-cloud provider is the backward-looking, overly-restrictive resistance to change evidenced by IT departments in large organizations. Because of such inertia, and because employees are driven to perform in order to be rewarded (or at least not penalized), it's becoming commonplace for those whose workflow can benefit from using cloud-based services to secretly implement them in the office. The problem with this scenario is that parallel IT infrastructures that operate in the shadows are not parallel at all. They touch the company's own infrastructure at various points; where they touch can represent vectors for new forms of attack on the company's business assets. The problem is magnified yet further by how cloud services are becoming cheaper, more powerful, and easier to sign up for and use. The solution, of course, isn't to avoid using the cloud but to integrate cloud service delivery models such as Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) into the existing IT infrastructure of your organization. Cloud service delivery provides the much needed interface between IT and business, making it possible for each to operate in its own style but in a compatible way. Standardized IaaS and PaaS services are a key factor in eliminating much of the custom IT deployments that previously cost so much time and money in traditional IT. And the results of implementing integrated cloud service delivery are greater agility for business, continued control for IT, and flexibility to both business and IT in terms of which types of tools, technologies, and cloud services are used. Extending to the cloud on demand So far, this chapter has described how changes in your on-premises infrastructure and a software- defined approach can make your IT infrastructure (and therefore your business) more agile. It has also described how Azure Stack will make this hybrid world an easy and manageable reality. Now, let's look briefly at how hybrid capabilities can help solve your existing problems and make your job easier. At the beginning of this chapter, we said that a hybrid cloud is the solution to the dilemma of needing to manage two separate infrastructures: the one in your datacenter and the one in the cloud. That's because the hybrid approach makes it possible for you to integrate your on-premises infrastructure

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