Data backup for mobile nodes: a cooperative middleware and an experimentation platform
Architecting dependable systems VII
AMORES: an architecture for mobiquitous resilient systems
Proceedings of the 1st European Workshop on AppRoaches to MObiquiTous Resilience
Availability modelling of a virtual black box for automotive systems
Proceedings of the 2nd International Workshop on Software Engineering for Resilient Systems
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Mobile devices (e.g., laptops, PDAs, cell phones) are increasingly relied on but are used in contexts that put them at risk of physical damage, loss or theft. This paper discusses the dependability evaluation of a cooperative backup service for mobile devices. Participating devices leverage encounters with other devices to temporarily replicate critical data. Permanent backups are created when the participating devices are able to access the fixed infrastructure. Several data replication and scattering strategies are presented,including the use of erasure codes. A methodology to model and evaluate them using Petri nets and Markov chains is described. We demonstrate that our cooperative backup service decreases the probability of data loss by a factor up to the ad hoc to Internet connectivity ratio.