Analysis of Software Availability/Reliability Under the Influence of Hardware Failures

Ushio Sumita, Yasushi Masuda

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


A new hardware-software reliability model is developed where lifetimes and repair times of the software subsystem have general system state-dependent distributions. The hardware subsystem constitutes an independent alternating renewal process having exponential up-times and general down-times. Multiple errors may be introduced or removed through repairs. The model is formulated as a multivariate stochastic process. To study the performance of the software subsystem under the influence of hardware failures, expressions of various time dependent performance measures are derived. Using the matrix Laguerre transform of Sumita [11], corresponding computational procedures are also developed. A numerical example is given, demonstrating speed, accuracy, and stability of these procedures.

Original languageEnglish
Pages (from-to)32-41
Number of pages10
JournalIEEE Transactions on Software Engineering
Issue number1
Publication statusPublished - 1986 Jan
Externally publishedYes


  • Integrated hardware-software reliability model
  • matrix Laguerre transform
  • multiple error generation and removal
  • state dependent general lifetimes and repair times
  • time-dependent compound performance measures

ASJC Scopus subject areas

  • Software


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