TAILIEUCHUNG - Operating System Concepts (15)

Module 15: Network Structures.• Background.• Motivation.• Topology.• Network Types.• Communication.• Design Strategies. Silberschatz and Galvin 1999 Node Types.• Mainframes (IBM3090, etc.). – example applications:. airline reservations. banking systems. – many large attached disks.• Workstations (Sun, Apollo, Microvax, RISC6000, etc.). – example applications:. computer-aided design. office-information systems. private databases. – zero, one or two medium size disks. Silberschatz and Galvin 1999 Nodes Types (Cont.).• Personal Computers. – example applications:. office information systems. small private databases. – zero or one small disk. Silberschatz and Galvin 1999 A Distributed System. Silberschatz and Galvin 1999 Motivation.• Resource sharing. – sharing and printing files at remote sites. – processing information in a distributed database. – using remote specialized hardware devices.• Computation speedup – load sharing.• Reliability – detect and recover from site failure, function transfer,. reintegrate failed site.• Communication – message passing. Silberschatz and Galvin 1999 Topology.• Sites in the system can be physically connected in a variety of. ways; they are compared with respect to the following criteria:. – Basic cost. How expensive is it to link the various sites in. the system?. – Communication cost. How long does it take to send a. message from site A to site B?. – Reliability. If a link or a site in the system fails, can the. remaining sites still communicate with each other?.• The various topologies are depicted as graphs whose nodes. correspond to sites. An edge from node A to node B. corresponds to a direct connection between the two sites• The following six items depict various network topologies Silberschatz and Galvin 1999 • Fully connected network.• Partially connected network. Silberschatz and Galvin 1999 • Tree-structured network.• Star network. Silberschatz and Galvin 1999 • Ring networks: (a) Single links. (b) Double links. Silberschatz and Galvin 1999 • Bus network: (a) Linear bus. (b) Ring bus Silberschatz and Galvin 1999 Network Types.• :Local-Area Network (LAN) – designed to cover small. geographical area – Multiaccess bus, ring, or star network – Speed 10 megabits/second, or higher – Broadcast is fast and cheap – Nodes:. usually workstations and/or personal computers. a few (usually one or two) mainframes Silberschatz and Galvin 1999 Network Types (Cont.)• Depiction of typical LAN:. Silberschatz and Galvin 1999 Network Types (Cont.).• Wide-Area Network (WAN) – links geographically separated. sites – Point-to-point connections over long-haul lines (often leased. from a phone company) – Speed 100 kilobits/second – Broadcast usually requires multiple messages – Nodes:. usually a high percentage of mainframes.

• Sáng kiến kinh nghiệm
• Operating system concepts
• Lecture Operating system concepts
• Operating system
• Operating system services
• Operating system structures
• Operating system design
• Operating system structure
• Hệ điều hành
• Lecture Operating system principles
• Computer system
• Modern operating systems
• Evolution of operating systems
• Multiprocessor operating systems
• Operating systems
• Lecture Operating systems
• Structure of operating systems
• Distributed operating systems
• Memory management
• Computer system organization
• Operating system concept
• File systems
• Operating systems design
• Operating systems capabilities
• Network operating system
• Operating System Debugging
• Operating System Generation
• Types of System Calls
• Bài giảng Hệ điều hành
• Lecture Advanced Operating Systems
• Advanced Operating Systems
• Bài giảng Hệ điều hành nâng cao
• Server operating systems
• PC operating systems
• Main frame operating systems
• Real time operating systems
• History of operating systems
• The operating system zoo
• Computer hardware review
• System calls
• Computer system structures
• Operations on processes
• Thread libraries
• CPU scheduling
• Process synchronization
• Handling deadlocks
• Virtual memory
• File system interface
• File system implementation
• Application I O interface
• Mass storage systems