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Client/Server Computing:

Client/Server Computing:. Clients, Severs, & Operating Systems The Martian C/S (Part 2) PCMag: 7/1/97 NOS PCMag: Beyond Unix. Peer-to-Peer. Pros: Simple to set up Efficient for small groups Allows resource sharing Cons: Security is limited no mechanism for large scale sharing

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Client/Server Computing:

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  1. Client/Server Computing: Clients, Severs, & Operating Systems The Martian C/S (Part 2) PCMag: 7/1/97 NOS PCMag: Beyond Unix

  2. Peer-to-Peer • Pros: • Simple to set up • Efficient for small groups • Allows resource sharing • Cons: • Security is limited • no mechanism for large scale sharing • Inefficient for large groups • Bad for important applications

  3. Anatomy of a Server program • Role is to serve multiple clients • Waits for client-initiated requests • Multitasking: many requests at once • Priority Queue • Background task activities • Mission-critical application • Scaleable

  4. Basic Server requirements of an OS • Preemptive Multi-tasking • Prioritization of tasks • Synchronization (Semaphores) • Local/Remote transparent • Thread capable • Resource protection (Sandbox1) • High performance file system • Memory managing (Sandbox2) • Extendable

  5. Extended OS services • Ubiquitous communications • Flexible access to shared resources • Network Management • Global dirs & Yellow Pages • Authentication services • Time, Database, TP monitoring • Object Oriented Services • Web, DNS, DHCP, etc.

  6. Anatomy of a Client • C/S systems are client centric • Non-GUI clients • ATM, barcode readers, cellphones • daemon programs, testers, agents • GUI clients • human interaction • occasional requests • Serial in nature • OOUI clients • Non-serial tasks

  7. OOUI • GUI • application centric • WIMP interface • OOUI • object centric • transparent access to applications • seamless OS extension • drag-and-drop interface • stated interface • user friendly

  8. Client requirements of an OS • RPC mechanism • File transfer • Task priorities • Interprocess communication • Threads & multitasking

  9. Server Scalability • Simple • Multiprocessing • Asymmetric(hierarchy) • Symmetric (equality) • Multiservers

  10. OS comparisons: Clients • Client centric • DOS & Win 3.x limited potential • Win95 ok only (OS/2) • 32-bit system required

  11. OS comparisons: Servers • IntranetWare • Netware File&print server standard • NT Server 4.0 • most new development • integration with BackOffice • OS/2 • Un*x • binary compatibility • Microkernels

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