client/server computing ajay kumar shrivastava. network operating system (nos) it manages the...
TRANSCRIPT
Network Operating System (NOS)
• It manages the services of the server• It exists at the session and presentation layers
of the client machine’s network management s/w.
• It provides the links to upper layer network management s/w.
• It offers reliability, performance, security, and internetworking.
Most popular LAN OS
• NetWare from Novell• LAN Manager from Microsoft• OS/2 LAN Server from IBM• VINES from Banyan
NetWare
• NetWare Lite is the new member of the family.• It is DOS based NOS.• Designed for small offices and peer-to-peer
systems.• NetWare can be used with bus or Token ring.• It can integrate DOS, OS/2, Macintosh, and UNIX
clients on a network.• NetWare 3.11 supports TCP/IP and its native
IPX/SPX protocol.
LAN Manager
• It works across multiple protocols, supporting NetBIOS or TCP/IP.
• It supports the mainframe environment through its compatibility with IBM OS/2 LAN server.
• It offers interoperability with NetWare through its NetWare connectivity program.
• It requires that the server run on OS/2.
LAN Manager Features
• Concept of a domain• OS/2 named pipes facility• Support for multiprocessing• A preemptive scheduler• Remote access service
OS/2 LAN Manager
• IBM has added two enhancements-Aliases-Dynamic resource sharing
• It facilitate the administration of large networks.
VIrtual NEtworking System (VINES)
• It is designed for large networks.• It can run over LANs server-to-server
interconnections to provide a single, global view of the enterprise network.
• It is based on a UNIX kernel.• VINES server can be a 286-486 machine running a
POSIX – complaint version of UNIX System V.• VINES internet protocol (VIP) is a native protocol.
Training advantages of GUI applications
• Reduced training cost-Training cost by 30%-40%- Training Time 10 weeks to 4 weeks
• Training the technical staff- Reduce the downtime- Overcome the Culture shock
System administrator training
• Should understand the requirement of System availability
• Ease of user• Should ware of technical and human
interaction protocols of working remotely.
System administrator training
• LAN administration• WAN administration• OS issues• PC/Workstation issues• Application issues
C/S System Development Methodology
• It describes a disciplined process through which technology can be applied to achieve the business objectives.
• It describes the process through the entire life cycle.
• Most integrator groups have their own life cycle management methodology.
System Planning
• Initiate system planning• Gather data• Identify current situation• Describe existing situation• Define requirements• Analyze applications and data architectures• Analyze technology platforms • Prepare implementation plan
Project Initiation
• Screen request• Identify relationship to long range• System plan• Initiate project• Prepare plan for next phase
Architecture Definition
• Gather data• Expand the requirements to the next level of
detail• Conceptualize alternative solutions• Develop proposed conceptual architecture• Select specific products and vendors
Analysis
• Gather Data• Develop a logical model of the new
application system• Define general information system
requirements• Prepare external system design
Design
• Perform preliminary design• Perform detailed design• Design system test• Design user aids• Design conversion system
Facilities Engineering
• Gather data• Conduct site survey• Document facility requirements• Design data center• Plan site preparation• Prepare site• Plan hardware installation• Install and test hardware
Implementation
• Develop contingency procedures• Develop maintenance and release procedures• Train system users• Ensure that production environment is ready• Convert existing data• Install application system• Support acceptance test• Provide warranty support
Post-implementation Support
• Initiate support and maintenance services• Support hardware and communication
configuration• Support software• Perform other project completion tasks as
appropriate