Dependability Evaluation of Cooperative Backup Strategies for Mobile Devices

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 encounte...

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Bibliographic Details
Main Authors: Courtes, L., Hamouda, O., Kaaniche, M., Killijian, M.-O., Powell, D.
Format: Conference Proceeding
Language:English
Subjects:
Cellular phones
Fault tolerance
Internet
IP networks
Mobile computing
Peer to peer computing
Personal digital assistants
Physics computing
Portable computers
Scattering
Online Access:Request full text
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Summary: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.
DOI:10.1109/PRDC.2007.21