C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. 1st International Conference on Parallel and Distributed Information Systems, 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....le systems, and or for le systems that provide built in support for concurrency [Stonebraker81, Stonebraker86] 3. Mobility: replicated and distributed le systems with disconnected and caching operations gure heavily in an environment where network latency and reliability is highly variable [Satyanarayanan90, Kistler91, Tait91, Tait92, Kistler93, Zadok93a, Kuenning94, Marsh94, Mummert95]. 4. Security: more secure le systems are sought, especially ones that securely export les over the network [Steiner88, Haynes92, Glover93, Takahashi95] An easy way to use encryption in le systems [Blaze93, Gutmann96, Boneh96] and the ability to provide special semantics via facilities such ....

C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. 1st International Conference on Parallel and Distributed Information Systems, 1991.

....away from its proxy, it will see gradual performance reductions. This performance loss may indicate a need to enable the mobile node to switch proxies; such a switching operation is new and has not been fully investigated. Just switching to a closer replica of a distant database is already tricky [57]. Managing additional dynamic program behavior could prove infeasible. 8. Security Security is an increasing concern in the design of mobile networking protocols and systems. As seen in the discussion about Mobile IP, authentication is critical to authorizing operations indicating the mobile ....

C. Tait and D. Duchamp, Service interface and replica consistency algorithm for mobile file system clients, in: 1st Int. Conf. Parallel and Distributed Information System (1991).

....whatever the standard LRU policy has kept in the cache. Finally, it should be noted that, although the disconnected service capabilities of these two systems are very limited, disconnected operation was not a significant design goal of either one. 9.1. 3 Tait and Duchamp Tait and Duchamp (TAD) [20, 98, 97, 96] have recently described a design for a file service that is specifically targeted at mobile clients. Their design has a fair bit in common with Coda s: both systems cache data in non volatile storage at clients; both exploit server replication and disconnected operation for availability; and both ....

Tait, C., and Duchamp, D. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. In Proceedings of the First International Conference on Parallel and Distributed Information Systems (December 1991).

....foreign network. In this way the user can achieve performance transparency. If the user now migrates to another network the cached information should somehow follow the user. Issues of file locking and synchronisation must also be addressed. Some work has been done in this area [Badrinath, 92] Tait, 91] 6 Conclusion True mobility requires MHPs that allow transparent access to network services in the local and wide area. A MHP, in addition to having operational and performance transparency, must satisfy some practical criteria that allow them to be implemented in the real world. This paper ....

C.Tait, D.Duchamp, Columbia University, Service Interface and Replica Consistency Algorithm for Mobile File System Clients, Conf. Parallel and Distributed Information Systems, Dec. 1991.

....must be able to provide service first from one server, then from another. This switching mechanism should require no action on the part of administrators (since presumably too many clients will move too often and too quickly for ad 1 Examples of such re thinking can be found in [Tait91b] and [Tait91a]. 1 2 CHAPTER 1. INTRODUCTION ministrators to track conveniently) and should be invisible to users, so that users need not become system administrators or notice when a switch is in progress. We have designed and implemented just such a file system it adaptively discovers and mounts a ....

C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. 1st International Conference on Parallel and Distributed Information Systems, 1991. BIBLIOGRAPHY 57

....fast from the caller s viewpoint. We employ an important optimization to eliminate most of the searching work when there is little sharing. Our technique carries other advantages as well: simple and flexible recovery algorithms, and suitability for mobile computing. 2 A Different Approach In [10] and [11] we have proposed the idea of supporting two read calls, which we name strict read( and loose read( With loose read( the file system will make a best effort to provide the latest value, but provides no guarantee. The strict form returns the most recent consistent value. We have ....

C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. In Proc. First Intl. Conf. on Parallel and Distributed Information Systems, pages 190-- 197. IEEE, December 1991.

....to using the Boston copies of common files like those in usr ucb. As the client moves, the file service must be able to provide service first from one server, then from another. This switching mechanism should require no action on the 1 Examples of such re thinking can be found in [25] and [26]. part of administrators (since presumably too many clients will move too often and too quickly for administrators to track conveniently) and should be invisible to users, so that users need not become system administrators. We have designed and implemented just such a file system it ....

C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. In Proc. First Intl. Conf. on Parallel and Distributed Information Systems, pages 190--197. IEEE, December 1991.

....themselves to continually provide a service point near to a mobile client. The basic idea is that the reconfigurable service provides a larger second level cache that follows the user around. We have designed and are implementing several reconfigurable services: a file replica management algorithm [9, 11]; an adaptive algorithm for paging from a mobile computer into the memory of the 4 closest paging server [8] and X window display [3] Each design took advantage of the unique aspects of the service to accomplish reconfiguration in the most natural way. Space limitations prevent describing ....

C. Tait and D. Duchamp. Service Interface and Replica Consistency Algorithm for Mobile File System Clients. In Proc. First Intl. Conf. on Parallel and Distributed Information Systems, pages 190-197. IEEE, December, 1991.

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