Information System Economics IT MAINTENANCE MANAGEMENT

The Elements of IT Maintenance Management  Strategy  Hardware  Software  Applications  System software  Networks  Data and system integrity

IT MAINTENANCE MANAGEMENT An IT Maintenance Strategy The maintenance strategy should isolate users as much as possible from service disruptions and system changes. The proper maintenance of hardware, software, communications, and data is essential to assure smooth operations.

IT MAINTENANCE MANAGEMENT HARDWARE  Managing capacity  Monitoring  Maintaining balance  How much slack?  Managing changes in technology  Sources of information  Vendors  Technology journals  Industry journals  Consultants

IT MAINTENANCE MANAGEMENT HARDWARE  Managing changes in technology (cont’d)  Migration  non-disruptive  maintains compatibility  Technical maintenance  contracts  levels of service  cost

IT MAINTENANCE MANAGEMENT THE SOFTWARE LIFE CYCLE 20-40% of life cycle cost 60-80% of life cycle cost analysis design programming and maintenance implementation elapsed time cost

IT MAINTENANCE MANAGEMENT SOFTWARE  environmental scanning  vendors  support  viability  product plans  maintenance agreements  service levels  cost  client responsibilities  period covered

IT MAINTENANCE MANAGEMENT SOFTWARE  change management  program changes controlled and impact assessed  maintenance sign-off  data administration sign-off  user sign-off  version control  change documentation

IT MAINTENANCE MANAGEMENT SOFTWARE Corrective Maintenance Procedures Step 1:Fully document problem. Step 2:Attempt to duplicate failure conditions. Step 3:Isolate cause of problem. Step 4:Resolve problem, if possible. Step 5:If problem unresolved, contact appropriate vendor Step 6:Apply vendor’s fix to problem Step 7:Document all changes

IT MAINTENANCE MANAGEMENT SOFTWARE Some IBM Software Maintenance Terminology Program Temporary Fix The patch supplied by IBM to remedy a (PTF) problem. This must be applied by the systems programmers. Authorized Programa) request by a user to have a problem resolved Analysis report (APAR)b) a patch similar to a PTF, usually not quite as complex, that fixes the problem. Program Update Tape A magnetic tape containing all of the fixes (PUT) applicable to a given operating system for a specific period of time (usually a month). System Modification A software program written by IBM to apply Program (SMF) all software maintenance to the system (MVS). Installation ProductivityInteractive product that assists the systems Option (IPO)programmer in installing an operating system

IT MAINTENANCE MANAGEMENT SOFTWARE The Problem of Legacy Systems  origins of the problem - varying life cycles  evaluating the problem  importance of the application  dependence on obsolete infrastructure  degree of change necessary

IT MAINTENANCE MANAGEMENT SOFTWARE Legacy Systems - Degree of Change Necessary restructure refurbish reengineer rejuvenate replace w. package rewrite low high

IT MAINTENANCE MANAGEMENT SOFTWARE Methods of Conversion to New systems MethodDescription Direct Conversion New system is implemented and previous system is immediately disabled. Modular Conversion Old system is slowly replaced on module- by-module basis. Parallel Conversion Both systems are run simultaneously and the results compared. Old system is removed only after correctness has been verified for some period of time.

IT MAINTENANCE MANAGEMENT NETWORKS Elements of Network Maintenance  Fault handling  Performance monitoring  Change management  Capacity planning  Cost control

IT MAINTENANCE MANAGEMENT Data and System Integrity  Clean up data definitions  Control shared data  Manage data distribution  Maintain data quality