Part I in .NET

Integrated qrcode in .NET Part I
Part I
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Technology Evolution
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The Internet Era
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As the prices of PCs dropped, demand continued to climb. With the power of the computer available to the general public, the need to share information became paramount. Another major event that would change computing forever was in the works. The popular use of the Internet grew exponentially in the 1990s and across the turn of the century (Y2K), surpassing all expectations. The Internet was created in 1969 as part of a project of the U.S. Department of Defense. Originally known as ARPANET (Advanced Research Projects Agency Network), it linked four computer sites at various universities and research centers and was used by scientists. Its usage grew to universities around the world throughout the 1970s, making it an international network, based on the TCP/IP protocol. As consumer products evolved to simplify access to the Internet, users in the general population discovered the power of using the Net. With the addition of the World Wide Web interface in 1990 which delivered web pages containing text, pictures, audio, and video more information began to appear and the Internet became a mainstay of both consumer and corporate communications. Companies like AOL, Google, Yahoo, and MSN sprung up to be the feeder services for all this information. These companies built and are continuing to build huge server farms, placed in rows and rows of racks to service billions of requests a day. In addition to internal private corporate networks, a new type of communications emerged, allowing companies to communicate across the public Internet, with technologies to provide various levels of security.
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The Consolidation Era
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The ubiquity of end users having their own computers on their desks changed the way businesses operate. However, it quickly became clear that managing all of the often geographically dispersed systems was a nightmare. Backing up all the information on these systems alone was an insurmountable task. So began efforts at recentralizing operations. It started with the business-critical servers and applications, then moved to critical business information and associated storage and, with advancements in management software, moved to recentralizing the systems themselves or at least the management of those systems to avoid loss of productivity or data at the remote locations. Throughout the 1980s and 1990s, waves of recentralization and decentralization occurred. When the Internet bubble burst in the late 1990s, the resulting economic downturn forced corporate IT management to begin slashing operational budgets. IT was responsible for managing large infrastructures based on a model where every server ran only one application (e.g., Exchange, SQL, etc.). Often
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Evolution of Computing Technology
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these servers were running somewhere around 5% CPU utilization. Under severe cost pressure, it no longer made sense to continue to manage this large underutilized collection of servers, taking up unnecessary space and using extra power and cooling. Thus began the era of server consolidation. The use of blade servers, with their ease of management and smaller footprint, coupled with server virtualization, is helping to facilitate this recentralization of servers, applications, and management into a set of consolidated blade-server systems. The inherent manageability built into blade servers and virtualization software also enables further recentralization of management for remote systems. Consolidation continues today in many businesses, not only with management of servers and applications but also with storage, centralizing information creation, and management in an effort to lower both CapEx and OpEx.
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The Evolution of Technologies
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As we ve moved through these eras, interesting changes in particular technology areas have taught us lessons that apply to blades and virtualization.
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The evolution of storage has followed many of the same trends seen with computers. As mentioned previously, core memory for the first computers was exceptionally small by today s standards. The ENIAC, hailed as the first electronic digital computer and recognized as the grandfather of today s computers, could only store 20 10-digit decimal numbers in its localized buffers there was no central memory. Even as more capabilities were added to computers, including core memory, it was obvious that the ability to feed large amounts of data in and out of the processor was necessary; hence the development of input and output mechanisms and external data storage. Before the advent of magnetic disk storage, programs and data were stored on punch cards, paper tape, and magnetic tape. Paper tape was a fairly inexpensive media that would normally hold about 400 bytes of data per tape and could be read at about 300 rows per second (8 channels per row). Magnetic tape was first developed in Germany in the 1920s but was only a research project until the 1940s, when the U.S. Navy became more interested in it. The Navy then funded U.S. researchers at 3M (Minnesota Mining and Manufacturing Company) to create both a high-quality magnetic tape and a tape recorder, which they did in 1945. All of this was happening at about the same time the first commercial ENIAC-type computer was being built (later renamed UNIVAC) with magnetic tape input/output. Unfortunately, the
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