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This Concept Map, created with IHMC CmapTools, has information related to: ch8 dist file, File service architecture: -flat file service-concerned with implementating operations on the contents of files, -directory service-provides a mapping between text names for files and their UFIDs, -client module- runs in each client computer, integrating and extending the operations of the flat file service and directory service under a single application programming interface that is available to user level programs in client computers, -flat file service interface- contains a definition of the interface to a flat file service, -access control- in Unix file system, the user's access rights are checked against the access mode requested in the open call and the file is opened if the user has necessary rights, -directory service interface- contains a definition of the RPC interface to a directory service, -hierarchic file system- Unix's provides consists of a number of directories arranged in a tree structure, -file groups- is a collection of files located on a given server has file service requirements: Transparency Concurrency Replication Heterogeneity Fault tolerance Consistency Security Efficiency..