PPT-Synchronization in Distributed File Systems

Advanced Operating System Zhuoli Lin Professor Zhang Outline Semantics of File Sharing File Locking Sharing File in Coda Future Work Semantics of File Sharing When two or more users share the same file at the same time it is necessary to define the semantics of reading and writing precisely to avoid problems. Access to resources of various machines is done explicitly by Remote logging into the appropriate remote machine Transferring data from remote machines to local machines via the File Transfer Protocol FTP mechanism Tightly Coupled Distributed System Lecture 1. Main Characteristics of Distributed Systems. Independent processors, sites, processes. Message passing. No shared memory. No shared clock. Independent failure modes. CS 271. 2. Distributed System Models. 3.1 Shared Memory Methods . Monitors . Protected Types. 3.2 Distributed Synchronization/Comm.. Message-Based Communication . Procedure-Based Communication . Distributed Mutual Exclusion. 3.3 Other Classical Problems. Spring 2009. L-1 Introduction. 1. Today's Lecture. Administrivia. Example topics. 2. 3. Instructors. Instructor. Srini. Seshan. srini@cmu.edu. , Wean Hall . 8113. Office hours: Thursday 1-2pm. Teaching . Spring 2015. Ki-. Joune. Li . http://isel.cs.pusan.ac.kr/~lik. Pusan National University. An . assignment. Choose an electronic (or electric) device . Define additional functions with. . data storage. from . Leslie . Lamport. Who is he?. Leslie . Lamport. (born February 7, 1941 in New York City) is an American computer scientist. . Lamport. is best known for his seminal work in distributed systems and as the initial developer of the document preparation system . Susmitha. . kota. . 21-sep-2015. AGENDA. Introduction. Synchronization. Physical Clocks. Global Positioning System. Algorithms. Future Work. References. Introduction: Real . Time System. Clocks. External clock synchronization (. Cristian. ). Internal clock synchronization (. Gusella. & . Zatti. ). Network Time Protocol (Mills). Decisions. Agreement protocols (Fischer). Data. Distributed file . deepika. . gopala. . AGENDA. Introduction. Clock Synchronization. Physical Clocks. Global Positioning System. Algorithms. References. Introduction: Synchronization. Communication is important, but how processes synchronize and cooperate with each other is also important.. Synchronization – Part I . Lecture 9. , October 2, . 2017. Mohammad Hammoud . Today…. Last Session. Naming . (concluded) . Today’s Session. Synchronization. Coordinated Universal Time (UTC). Tracking Time on a Computer. What is a hard disk partition?. File Systems - Partitions. What is a hard disk partition?. Physical (or logical) storage space division on disk. Typically, so can put a file system inside the partition. Early Adopter: ASU - Intel Collaboration in Parallel and Distributed Computing Yinong Chen , Eric Kostelich , Yann -Hang Lee, Alex Mahalov , Gil Speyer, and Violet R. Syrotiuk 1 st NSF /TCPP Workshop on Parallel and Distributed Computing Education ( 3. Higher-Level Synchronization 3.1 Shared Memory Methods Monitors Protected Types 3.2 Distributed Synchronization/Comm. Message-Based Communication Procedure-Based Communication Distributed Mutual Exclusion Metdata. Management for Distributed File Systems. Thomas Kao. 1. Background. Scalable solutions provided for data storage, why not file systems?. 2. Motivation. O. ften . bottlenecked by the metadata management .