Recovery guarantees in mobile systems
Proceedings of the 1st ACM international workshop on Data engineering for wireless and mobile access
Support for Recovery in Mobile Systems
IEEE Transactions on Computers
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The mobile wireless environment poses challenging fault-tolerant data management problems due to mobility of users, and limited bandwidth on the wireless link. Traditional fault-tolerance schemes, therefore, cannot be directly a these syst ems. Mobile systems are often subject to environmental conditions which can cau se loss of communications or data. Because of the consumer orientation of most mobile systems, run-time faults must be corrected with minimal (if an) intervent ion from the user. The fault-tolerance capability must therefore be self-contai ned. Schemes for recovery upon a failure of a mobile host are presented here. This report portrays the limitations of the mobile wireless environment, and its impact on recovery protocols. To this effect, extensions to existing tradition al recovery schemes are presented which suit the mobile environment. the perfor mance of these schemes has been analyzed to determine those environments where a particular recovery scheme is best suited. The performance of the recovery sch emes mainly depends on (i) the cost of wireless transmission, (ii) the communica tion-mobility ratio of the user, and (iii) the failure rate of the mobile host.