Title | On the analysis of software rejuvenation policies |
Publication Type | Journal Article |
Year of Publication | 1997 |
Authors | S Garg, M Telek, A Puliafito, and KS Trivedi |
Journal | COMPASS - Proceedings of the Annual Conference on Computer Assurance |
Start Page | 88 |
Pagination | 88 - 96 |
Date Published | 01/1997 |
Abstract | Software rejuvenation is a technique for software fault tolerance which involves occasionally stopping the executing software, `cleaning' the `internal state' and restarting. This cleanup is done at desirable times during execution on a preventive basis so that unplanned failures, which result in higher costs compared to planned stopping, are avoided. Since during rejuvenation, the software is typically unavailable or in a degraded mode of operation, the operation involves a cost. In this paper, we present an analytical model of a software system which serves transactions. Due to `aging', not only the service rate of the software decreases with time but the software itself experiences occasional crash/hang failures. We propose and compare two rejuvenation policies. The policies are evaluated for the resulting steady state availability as well the probability that a transaction is denied service. We also numerically illustrate the use of our model to compute the optimal rejuvenation interval which minimizes (maximizes) the loss probability (steady state availability). |
Short Title | COMPASS - Proceedings of the Annual Conference on Computer Assurance |