A mobility-aware file system for partially connected operation

Authors:
Dane Dwyer;Vaduvur Bharghavan
Affiliations:
Coordinated Science Laboratory, University of Illinois at Urbana-Champaign;Coordinated Science Laboratory, University of Illinois at Urbana-Champaign
Venue:
ACM SIGOPS Operating Systems Review
Year:
1997

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Abstract

The advent of affordable off-the-shelf wide-area wireless networking solutions for portable computers will result in partial (or intermittent) connectivity becoming the common networking mode for mobile users. This paper presents the design of PFS, a mobility-aware file system specially designed for partially connected operation.PFS supports the extreme modes of full connection and disconnection gracefully, but unlike other mobile file systems, it also provides an interrace for mobility-aware applications to direct the file system in its caching and consistency decisions in order to fully exploit intermittent connectivity. Using PFS, it is possible for an application to maintain consistency on only the critical portions of its data files. Since PFS provides adaptation at the file system level, even unaware applications can 'act' mobile-aware as a result of the transparent adaptation provided by PFS.