A measure of guaranteed availability and its numerical evaluation

Author

Goyal, Ambuj ; Tantawi, Asser N.

Author_Institution

IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA

Volume

37

Issue

1

fYear

1988

fDate

1/1/1988 12:00:00 AM

Firstpage

25

Lastpage

32

Abstract

A success (risk) measure of guaranteed availability is proposed. Using a genetic system model, the authors describe the measure and study the effects of the guaranteed level and the observation period on it. Furthermore, they introduce a numerical approach for continuous-time Markov chain models which allows component-level modeling, Coxian failure and repair distributions, time-dependent failure and repair rates and deferred repair and nondeferred repair strategies to be handled. An example of a fault-tolerant database computer system is considered and the measure of guaranteed availability is evaluated for various guaranteed levels and observation periods

Keywords

Markov processes; fault tolerant computing; function approximation; numerical methods; Coxian failure and repair distributions; component-level modeling; continuous-time Markov chain models; deferred repair; fault-tolerant database computer system; guaranteed availability; nondeferred repair; numerical evaluation; risk measure; success measure; time-dependent failure and repair rates; Availability; Computer errors; Costs; Fault tolerant systems; Frequency measurement; Random variables; Steady-state; Time measurement; Transaction databases;

fLanguage

English

Journal_Title

Computers, IEEE Transactions on

Publisher

ieee

ISSN

0018-9340

Type

jour

DOI

10.1109/12.75148

Filename

75148