What is a thin client? What is a thin client? A thin client is a device for input and display of information (terminal). Physically, a thin client is a compact and silent computer without a hard disk (and without fans), the main operating system of which is loaded on the server. All user applications run on a terminal server (application server), but this is completely transparent to the user. Since the entire computational load falls on the server, the thin client has a minimal hardware configuration without any performance degradation. What are thin clients used for? Thin clients are used in organizations where the majority of users use computers to perform similar tasks: working with databases, information catalogs (shops, pharmacies, libraries), working as bank terminals, etc. What is the operating system on the terminal? The terminal operating system is "flashed" into a small disk-on-module device (flash memory 64MB-1GB). It provides the basic functionality of the client: bootstrapping, correct operation of the video adapter, audio, operation of peripheral devices connected directly to the terminal client (mouse, keyboard, local printers, USB flash drives). Also, the operating system of a thin client may contain an Internet browser that can work autonomously (without a terminal server). When switching to terminal mode, the client starts working with the server operating system, the individual session of which is launched on the terminal server. From this point on, the terminal becomes just a means of displaying and entering information. What software licenses are needed? To organize the work of a group of terminals with Microsoft software, in general, the following licenses are required : Licenses for embedded OS on terminals (Win CE 5.0 or Win XP Embedded), license for a server OS (Windows Server 2008), client access licenses (Windows Server CAL 2008) - the required number of licenses is equal to the number of terminals, terminal access licenses (Windows Trmnl Svcs CAL 2008) - the required number of licenses is equal to the number of terminals or users. Licensing of application programs, as a rule, is carried out on the basis of how many users (terminals), and how many licenses. Advantages of using thin clients instead of conventional PCs: lower initial acquisition costs due to minimal configuration requirements; Significant reduction in power consumption - a typical thin client has a power consumption of only 10W (versus 250-350W for a PC) unification - all clients have the same set of software; ease of implementation of tasks - there is no need to configure each computer separately, since the centralized management of clients is carried out. The system administrator performs all settings for managing thin clients centrally on the server; saving the time of the system administrator who serves exactly the same computers, the probability of breakdowns of which is minimized, and all programs are installed on the server; scalability - once a system image is created for the entire user group to support an easily scalable network. You can install as many PCs as required, while adding new jobs requires minimal effort; security and resiliency. The terminal, when booting, receives an operating system "from the manufacturer", the setting of which is carried out only by the information support department. All user information is stored on the server on a RAID array and is regularly backed up, which increases fault tolerance; protection against information leaks - no local media - there is no way to make copies of documents on removable media (if the opposite is not allowed by the system administrator). Comparison of the cost of implementing a solution for terminals and PCs for a workgroup for 40 users: Наименование Стоимость, руб Количество Всего (для тонких клиентов), руб Всего (для ПК), руб ОС Windows Server 2003 R2 Standard (Сервер + 5 клиентских лицензий) 22131 1 22131 22131 Windows Server 2003 CAL 5 clt. (пакет в 5 клиентских лицензий) 4214 7 29498 29498 Лицензии терминального доступа (Terminal Server Client Access License) 2260 40 90400 0 ОС Windows CE 5.0 включено 40 0 0 ОС Windows XP Professional 4209 40 0 168360 Сервер для решения на ПК Team Server 3000P 36600 1 0 36600 Сервер для решения на тонких клиентах Team Server 1500A 68400 1 68400 0 Тонкий клиент Norma-TS L66VC-CE 6499 40 259960 0 ПК Team Office b352 8372 40 0 334880 Монитор LCD 17" 7369 40 294760 294760 Клавиатура и мышь 651 40 26040 26040 Итого: 791189 912269 Стоимость рабочего места: 19779 22806 Цены действительны на дату написания статьи и могут быть использованы только для сравнения. 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