For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
A Markovian Software Availability Measurement with a Geometrically Decreasing Failure-Occurrence Rate
Koichi TOKUNO Shigeru YAMADA
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/06/25
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Reliability and Fault Analysis
software availability, measurement and assessment, Markov process, instantaneous software availability,
Full Text: PDF>>
We develop a software availability model incorporating software failure-occurrence and fault-correction times, under the assumption that the hazard rate for software failure-occurrence decreases geometrically with the progress in fault-removal process. Considering that the software system alternates two states, i.e. the operational state that a system is operating and the maintenance state that a system is inoperable due to the fault-correction activity, we model the time-dependent behavior of the system with a Markov process. Expressions for several quantities of software system perfomance are derived from this model. Finally, numerical examples are presented for illustration of software availability measurement.