H. Wedde, K. B., S. Chen, D. C. Daniels, S. Nagaraj, and B. Santhanam. Transparent access to large files that are stored across sites. In Readings in Distributed Computing Systems, IEEE Tutorial Series, IEEE Computer Soc. Press, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

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H. Wedde, K. B., S. Chen, D. C. Daniels, S. Nagaraj, and B. Santhanam. Transparent access to large files that are stored across sites. In Readings in Distributed Computing Systems, IEEE Tutorial Series, IEEE Computer Soc. Press, 1994.

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Horst F. Wedde, Bogdan Korel, Shengdong Chen, Douglas C. Daniels, Srinivasan Nagaraj, and Babu Santhanam. Transparent Access to Large Files That Are Stored across Sites. In Readings in Distributed Computing Systems Theory. IEEE Computer Society Press, 1994.

....Both conflicts and violations may be detected on the logical level or through a request evaluation. Since the authorization spheres are covering only few groups in the system only a small subset of rules would be evaluated once a user wants to access a file Under the Dragon Slayer system [9] all nodes which store a replica of a file (storage node) and the node where the user resides, collaborate to decide whether the access is granted or denied. The decentralized evaluation and the adaptive administration of our authorization rules are beyond the scope of this paper. They are ....

H. F. Wedde, B. Korel, S. Chen, D. C. Daniels, S. Nagaraj, and B. Santhanam. Transparent Access to Large Files That Are Stored across Sites. In Readings in Distributed Computing Systems Theory. IEEE Computer Society Press, 1994.

....stored in the files. If specific information has to be found and the file name assigned to it is not known, a full text search of all files in the system has to be done. If the system contains many large files subdivided into parts, distributed on many computers and replicated (as described in [1]) this type of information search is not only time consuming but unacceptably inefficient because text patterns without context are searched during a full text search. Moreover, the only option is to search for textual information. A search for graphic, visual or audio information needs ....

....or audio information needs additional textual information in such systems. The Dragon Slayer project was started in cooperation with the IBM Endicott, NY Labs, in order to provide uniform operating system support running on a network of heterogeneous hardware architectures and operating systems [1]. In the sequel we identified, through studying a variety of comprehensive multimedia scenarios [2] the need for an efficient free attribute management as the most promising approach to supporting an appropriate search for multimedia objects files. Multimedia objects are combined from visual, ....

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H. Wedde, K. B., S. Chen, D. C. Daniels, S. Nagaraj, and B. Santhanam. Transparent access to large files that are stored across sites. In Readings in Distributed Computing Systems, IEEE Tutorial Series, IEEE Computer Soc. Press, 1994.

....in cooperation with, and major funding from, the IBM Corporation. In its first phase the focus was on novel distributed file services, in particular efficient simultaneous access to distributed file copies, on top of heterogeneous operating system platforms, under completely decentralized control [8]. Both heterogeneity and distributed file support were transparent to the user (Single Image Capability [2] After porting this development to the University of Dortmund it underwent a complete, object oriented redesign, also integrating traditional and novel operating system services (for the ....

....replicas. Mutual consistency is achieved through flexible yet efficient distributed resource B C Knoten A Systemsicht Benutzersicht Abschnitt 2 Abschnitt 3 Abschnitt 1 Fragmente replizierte Dragon Slayer Datei Figure 4: fragmentation and replication of a file object scheduling algorithms [8]. 4 Communication DRAGON SLAYER III uses a number of communication types ranging from broadcast to multicast and secured point to point communication messages depending on the needs of the distributed operating system, as this is supported by a new reliable delivered message protocol [Sie98] A ....

H. Wedde, K. B., S. Chen, D. C. Daniels, S. Nagaraj, and B. Santhanam. Transparent access to large files that are stored across sites. In Readings in Distributed Computing Systems, IEEE Tutorial Series, pages 0--0. IEEE Computer Soc. Press, 1994.

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