Information System Economics

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1242.2219 Information System Economics IT
MAINTENANCE MANAGEMENT
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IT MAINTENANCE MANAGEMENT

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

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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.
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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

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IT MAINTENANCE MANAGEMENT

• HARDWARE
• Managing changes in technology (contd)
• Migration
• non-disruptive
• maintains compatibility
• Technical maintenance
• contracts
• levels of service
• cost

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

• SOFTWARE
• environmental scanning
• vendors
• support
• viability
• product plans
• maintenance agreements
• service levels
• cost
• client responsibilities
• period covered

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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

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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 vendors fix to problem
Step 7 Document all changes
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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
Program a) 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 Productivity Interactive
product that assists the systems Option
(IPO) programmer in installing an operating
system
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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

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IT MAINTENANCE MANAGEMENT
SOFTWARE Legacy Systems - Degree of Change
Necessary
rewrite
replace w. package
rejuvenate
reengineer
refurbish
restructure
low
high
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IT MAINTENANCE MANAGEMENT
SOFTWARE Methods of Conversion to New systems
Method Description
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.
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IT MAINTENANCE MANAGEMENT

• NETWORKS
• Elements of Network Maintenance
• Fault handling
• Performance monitoring
• Change management
• Capacity planning
• Cost control

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IT MAINTENANCE MANAGEMENT

• Data and System Integrity
• Clean up data definitions
• Control shared data
• Manage data distribution
• Maintain data quality