| タイトル | Stochastic Petri net analysis of a replicated file system |
| 著者（英） | Bechta Dugan, Joanne; Ciardo, Gianfranco |
| 著者所属（英） | Duke Univ.|Software Productivity Consortium |
| 発行日 | 1989-04-01 |
| 言語 | eng |
| 内容記述 | A stochastic Petri-net model of a replicated file system is presented for a distributed environment where replicated files reside on different hosts and a voting algorithm is used to maintain consistency. Witnesses, which simply record the status of the file but contain no data, can be used in addition to or in place of files to reduce overhead. A model sufficiently detailed to include file status (current or out-of-date), as well as failure and repair of hosts where copies or witnesses reside, is presented. The number of copies and witnesses is a parameter of the model. Two different majority protocols are examined, one where a majority of all copies and witnesses is necessary to form a quorum, and the other where only a majority of the copies and witnesses on operational hosts is needed. The latter, known as adaptive voting, is shown to increase file availability in most cases. |
| NASA分類 | CYBERNETICS |
| レポートNO | 89A32091 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/364431 |
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