OPTIMAL ARCHIVE COPY INTERVAL FOR A FILE RECOVERY WITH GENERAL FAULT LATENCY TIME
Sayori Nakagawa, Naohiro Ishii, Satoshi Fukumoto, Shigeru Yamada · International Journal of Reliability Quality and Safety Engineering · 1999
This paper considers the stochastic model of a file recovery mechanism: archive copies with n available generations are created periodically at constant time T. When failures have been detected, the consistent state is restored at the time just before fault occurrence by archive copies. The recovery overhead and its mean time are obtained when the fault latency time has a general distribution and a failure is detected uniformly during the copy interval. An optimal interval T* of archive copies is discussed analytically. Numerical examples are given when the fault latency time has exponential and gamma distributions.