Synchronizing every node in the network including cache if available with the latest modifications to data is crucial for distributed data storages. Disclaimer: This work has been submitted by a student. AFS uses a state-full server where information about open file connection from each client is kept track in the server. *You can also browse our support articles here >, Lower-level protocols: Define protocols in Physical, Data link and Network layers, Transport protocols: Transfer messages between clients, including breaking them, High-level protocols: Define protocols in Session, Presentation and Application layers, How to name files / transparency (How mounting occurs). In the following section we will describe selected few important features of the 2K system model. The distribution management functionalities such as process or virtual memory management, object naming is provided by a distributed kernel of the distributed system . So the user sees all files are stored in his computer’s disk and can access files without the knowledge of physical location of the file. %PDF-1.5 . An architecture for distributed operating system named 2K is explained under “Distributed operating systems”. Usually DFSs does not have the property of location independence since the name of the file is used by the file system to find the physical location (or locations if the file is scattered) and changing the physical location will result in the change of the name of the file. Under MAC users except administrative users cannot override or modify this policy, either accidentally or intentionally. Multi-level data requires the use of data encryption equipment that meet COMSEC requirements . This common repository, could even be a simple database. Event data is delivered via messages. To cope with all these cons in centralized systems the distributed system architecture was introduced few decades ago. (In AFS server is called as “Vice” and client is called as “Venus”). %PDF-1.3 %���� 3. Multi-level store memory and single level store memory. Hint manager keeps hints of the object location. In NFS, each machine can act as a server and a client. Clients access services according the interface. 0000003229 00000 n In the NC system, new additional layer of software is introduced to in between the user application and the UNIX kernel. Inter processes communication can be facilitated by message oriented communication which correspondent to events. Distributed file system (DFS) – a distributed implementation of the classical time-sharing model of a file system, where multiple users share files and storage resources.!
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