NDLI: Hierarchical computation of interval availability and related metrics

Content Provider	IEEE Xplore Digital Library
Author	Dong Tang Trivedi, K.S.
Copyright Year	2004
Description	Author affiliation: Sun Microsystems Inc., Santa Clara, CA, USA (Dong Tang)
Abstract	As the new generation high-availability commercial computer systems incorporate deferred repair service strategies, steady-state availability metrics may no longer reflect reality. Transient solution of availability models for such systems to calculate interval availability over shorter time horizon is desirable. While many solution methods for transient analysis have been proposed, how to apply these methods on hierarchical models has not been well addressed. This paper describes an approach to computing interval availability and related metrics for hierarchical Markov models. The approach divides the time interval of interest into small subintervals such that the input parameters can be treated as constants in each subinterval to make the model satisfy the homogeneous Markov property, and then pass the output interval availability metrics as constants from the sub-model to its parent model. Finally, these quantities are integrated to obtain the expected interval availability for the entire interval. The study also addresses methods of passing parameters across levels for generating multiple metrics from a hierarchical model. The approach is illustrated with an example model and has been implemented in RAScad. All computations for the example model have also been carried out using the SHARPE textual language interface.
Sponsorship	IEEE Comput. Soc. Tech. Committee on Fault-Tolerant Comput. IFIP WG 10.4 on Dependable Comput. and Fault Tolerance
Starting Page	693
Ending Page	698
File Size	346262
Page Count	6
File Format	PDF
ISBN	0769520529
DOI	10.1109/DSN.2004.1311940
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-28
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Availability Sun Steady-state Transient analysis Mathematical model Costs Design engineering Computer interfaces Computer networks High performance computing
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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