OS_Ch16
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This document provides an overview of distributed file systems (DFS), including their structure, naming and transparency, remote file access, caching, and example systems. Some key points: - A DFS manages dispersed storage devices across a network to provide shared files and storage. It provides location transparency so the physical location of files is hidden from users. - Remote file access in DFS is enabled through caching, where frequently accessed data is cached locally to reduce network traffic. This raises cache consistency issues in keeping cached copies up-to-date. - The Andrew distributed computing environment example presented a DFS with a shared name space spanning over 5,000 workstations using whole-file caching for remote access.
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- Key components of distributed file systems such as naming, caching, writing policies, availability, scalability, and cache consistency.
Ds
A distributed file system (DFS) allows storage and access of files across networked computers. It employs concepts like transparency, caching, replication and access control to provide a coherent view of files. A DFS consists of directory services to look up file locations, authorization services to control access, file services to read/write files and system services for device and block management. Files can be organized hierarchically with directories and accessed using pathnames. Version control separates enforcing sharing semantics from file services by labeling file revisions with version numbers.
Ds
A distributed file system (DFS) allows storage and access of files across networked computers. It employs concepts like transparency, caching, replication and access control to provide a coherent view of files. A DFS consists of directory services to locate files, authorization services to control access, file services to read/write files and system services for device and cache management. Files can be organized hierarchically with directories and accessed using pathnames. Version control is needed to coordinate concurrent access and updates to shared files across multiple clients in a DFS.
Survey of distributed storage system
This slide introduces DAS, NAS, SAN and something about object storage, storage virtualization and distributed file system.
Distributed File Systems
Distributed File Systems: File service architecture, Distributed File Systems Implementation,
Naming System, Network File System (NFS), Flat and nested distributed transactions,
Atomic commit protocols, Concurrency control in distributed transactions, Distributed
deadlocks.
Distributed file systems (from Google)
This document summarizes a lecture on distributed file systems. It discusses Network File System (NFS) and the Google File System (GFS). NFS allows remote access to files on servers and uses client caching for efficiency. GFS was designed for Google's need to redundantly store massive amounts of data on unreliable hardware. It uses large file chunks, replication for reliability, and a single master for coordination to provide high throughput for streaming reads of huge files.
Distributed computing seminar lecture 3 - distributed file systems
The document summarizes a lecture on distributed file systems. It discusses Network File System (NFS), including its protocol, client caching, and tradeoffs. It also discusses the Google File System (GFS), including its assumptions, design decisions like single master architecture and chunk replication, relaxed consistency model, and responsibilities of the master in coordinating metadata and fault tolerance.
Lec3 Dfs
The document summarizes a lecture on distributed file systems. It discusses Network File System (NFS), including its protocol, client caching, and tradeoffs. It also discusses the Google File System (GFS), including its assumptions, design decisions like single master architecture and chunk replication, relaxed consistency model, and responsibilities of the master in coordinating metadata and fault tolerance through replication.
Similar to OS_Ch16 (20)
Hadoop Distributed File System for Big Data Analytics
Hadoop Distributed File System for Big Data Analytics
Distributed computing seminar lecture 3 - distributed file systems
Distributed computing seminar lecture 3 - distributed file systems
More from Supriya Shrivastava
OS_Ch17
This document discusses several key concepts in distributed systems including event ordering, mutual exclusion, concurrency control, deadlock handling, and election algorithms. It provides details on implementing happened-before relations to ensure event ordering. It describes centralized and distributed approaches for mutual exclusion and discusses two-phase commit and locking protocols for concurrency control. It also covers deadlock prevention techniques like timestamp ordering and various distributed deadlock detection algorithms. Finally, it summarizes bully and ring algorithms for electing a new coordinator when failures occur.
OS_Ch19
This document discusses various security issues related to computer systems and networks. It covers authentication methods, threats like Trojan horses and viruses, intrusion detection techniques, and encryption standards. It also describes security classifications used by the Department of Defense and security features in Windows NT.
OS_Ch15
This document discusses network structures and distributed systems. It covers topics like network types (LANs and WANs), communication protocols, robustness through failure detection and reconfiguration, and design strategies for distributed systems. The key aspects are sharing resources across multiple connected sites, improving reliability through redundancy, and making the distribution transparent to users.
OS_Ch14
The document discusses mass storage systems including disk structure, disk scheduling algorithms, disk management, RAID structure, disk attachment methods, stable storage implementation, and tertiary storage devices. It provides details on how disks are logically structured and mapped, common disk scheduling algorithms like FCFS, SSTF, SCAN, and C-SCAN, and how operating systems manage disks through partitioning and formatting. It also summarizes RAID levels, approaches to stable storage, and examples of tertiary storage devices like tapes, optical disks, and removable magnetic disks.
OS_Ch13
This document discusses I/O systems and their components. It describes I/O hardware including devices, ports, buses and controllers. It then discusses the application I/O interface, kernel I/O subsystem, and how I/O requests are transformed to hardware operations. It also covers various types of I/O devices, blocking vs non-blocking I/O, kernel data structures used for I/O, and factors that influence I/O performance.
OS_Ch11
The document discusses various concepts related to file systems including file structure, attributes, operations, access methods, directory structure, mounting, sharing and protection. It describes the basic components of a file system including files, directories and how they are organized in a tree structure with path names to locate files efficiently. It also covers common file operations, sequential and direct access methods, and how files can be shared across systems through mounting and network file sharing protocols.
OS_Ch10
Virtual memory allows processes to access memory addresses that exceed the amount of physical memory available. When a process references a memory page that is not in RAM, a page fault occurs which brings the missing page into memory from disk. Page replacement algorithms are used to determine which page to remove from RAM to make room for the new page. Factors like page fault rate, locality of reference, and thrashing are important considerations for virtual memory performance.
OS_Ch7
This document discusses various techniques for process synchronization including the critical section problem, semaphores, and classical synchronization problems like the bounded buffer, readers-writers, and dining philosophers problems. It provides code examples to illustrate how semaphores can be used to synchronize access to shared resources and ensure mutual exclusion between concurrent processes.
OS_Ch9
This document discusses different memory management techniques including:
1. Contiguous allocation allocates processes to contiguous regions of memory but can lead to fragmentation. Paging and segmentation address this by allowing non-contiguous allocation.
2. Paging maps logical addresses to physical frames through a page table. It supports non-contiguous allocation but has translation overhead that is reduced using translation lookaside buffers.
3. Segmentation divides memory into logical segments and uses a segment table to map logical to physical addresses. It matches the user's view of memory but external fragmentation remained an issue until combined with paging.
OS_Ch8
The document discusses various techniques for handling deadlocks in computer systems, including deadlock prevention, avoidance, detection, and recovery. It defines the four necessary conditions for deadlock, and describes resource-allocation graphs and wait-for graphs that can be used to model deadlock states. Detection algorithms periodically check the resource-allocation graph for cycles that indicate a deadlock. Upon detection, various recovery techniques can be used like terminating processes, preempting resources, or rolling back to a previous safe state. An optimal approach combines prevention, avoidance and detection tailored for each resource class.
OS_Ch21
Windows 2000 is a 32-bit preemptive multitasking operating system developed by Microsoft for Intel microprocessors. It uses a micro-kernel architecture and supports extensibility, portability, reliability, compatibility, and internationalization. The key components of Windows 2000 include the kernel, executive services, and various environmental subsystems that emulate other operating systems and provide security functions.
OS_Ch20
The document provides an overview of the history and components of the Linux operating system. It discusses how Linux originated as a small kernel developed by Linus Torvalds in 1991 and has since evolved through collaboration. The key components of Linux include the Linux kernel, system libraries, system utilities, and kernel modules. Linux uses a multi-user, multi-tasking model and adheres to UNIX standards and design principles.
OS_Ch3
The document provides an overview of operating system structures and components. It discusses process management, memory management, file management, I/O system management, secondary storage management, networking, protection systems, command interpreters, system calls, system programs, virtual machines, system design and implementation, and system generation.
OS_Ch1
The document provides an introduction to operating systems, describing their main components and functions. It discusses different types of operating systems including mainframe systems, desktop systems, multiprocessor systems, distributed systems, clustered systems, real-time systems, and handheld systems. For each type, it highlights some of their key characteristics and how operating systems have evolved to support different computing environments.
OS_Ch5
This document discusses different models of multithreading including many-to-one, one-to-one, and many-to-many. It also covers threading issues, common threading APIs like Pthreads, and how threads are implemented in different operating systems including Solaris, Windows 2000, Linux, and Java.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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