Client/Server Computing
Ajay Kumar Shrivastava
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
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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
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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
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
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LAN administration
WAN administration
OS issues
PC/Workstation issues
Application issues
Programmers resistance to new
technology
Database administrator training
END user training
• Workstation operations
• Application and new technologies
Training delivery technology
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
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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
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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
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Perform preliminary design
Perform detailed design
Design system test
Design user aids
Design conversion system
Development
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Set up development environment
Code modules
Develop user aids
Conduct system test
Facilities Engineering
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Gather data
Conduct site survey
Document facility requirements
Design data center
Plan site preparation
Prepare site
Plan hardware installation
Install and test hardware
Implementation
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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
System integration life cycle
1
System
planning
2
Project
initiation
3
Architecture
Definition
System Encyclo.
4
5
Analysis
Design
7
Facilities
Engineeri
-ng
8
Implementation
6
Development
9
Post
implemen
tation
support