The PerDiS FS: a transactional file system for a distributed persistent store

Companies cooperating in the framework of a virtual enterprise have increasing demands for systems on which to base applications for their particular environment: groups of workers on distant independent LANs. In this paper, we present a transactional file system for a distributed persistent store designed to support cooperative engineering applications. The system integrates techniques, such as optimistic consistency protocols and versioning, tailored to provide efficient sharing of data, between users (at LAN scale) and between companies (at WAN scale).