COMP325 CH 09 - System Architecture

COMP325 CH 09 - System Architecture - Systems Analysis and...

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Systems Analysis and Business  Applications COMP325 Chapter 8 System Architecture
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2 Introduction An effective system combines elements  into an architecture, or design, that is: Able to support the information needs of  the business (first and foremost) Flexible Cost-effective Technically sound Designed to easily accommodate growth Scalable (extensible)
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3 Introduction System architecture translates the  logical design  of an information system  into a  physical structure  that includes: Hardware Processing methods/operation schedule Security & control
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4 Introduction System architecture translates the  logical design  of an information system  into a  physical structure Requires the expertise of many disciplines DBA Operations Systems Networking Help Desk Librarians Applications and many others …….
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5 System Architecture Checklist Scalability Scalability, also called extensibility Especially important in implementing  systems that are volume-related, such as  transaction processing systems (TPS) An information system includes application  programs and/or simply applications
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6 System Architecture Checklist Legacy System Interface Requirements The new system might have to interface with one  or more legacy systems Interfacing a new system with legacy systems  involves analysis of data formats and  compatibility The analyst must know if the new application  eventually will replace the legacy system Why so important?
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7 System Architecture Checklist System Interface Requirements 1. New hardware – replaces old 2. New (upgraded) IS – replaces old 3. Existing data – must be carried forward  and, most likely, converted
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8 System Architecture Checklist Legacy System Interface Requirements Legacy systems are traditionally  associated with mainframe systems Legacy systems may also be systems that  use older technology and/or development  techniques Analysis of data formats and compatibility  is often a major issue –  detail discussion in Chapter  10
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9 System Architecture Checklist Processing Options In planning the architecture, designers also  must consider how the system will process  data - online or in batches or both 24/7 or precise schedule Provision must be made for backup and  speedy recovery in the event of system  failure Hot site – duplicate system
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10 System Architecture Checklist Security Issues Security is a concern at every stage of  system development Must consider security issues that relate to  system design specifications and  determine how the company will address  them Web-based systems introduce additional  security concerns (intrusion, hackers)
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This note was uploaded on 04/07/2008 for the course COMP 325 taught by Professor Dionisio during the Spring '08 term at Wentworth Institute of Technology.

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COMP325 CH 09 - System Architecture - Systems Analysis and...

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