Chapter 11 Distributed File Systems. Distributed File Systems
|
|
- Hope Summers
- 8 years ago
- Views:
Transcription
1 Chapter 11 Distributed File Systems Introduction Case studies NFS Coda 1 Distributed File Systems A distributed file system enables clients to access files stored on one or more remote file servers A file service specifies what the file system offers A file service is specified by a set of primitives or operations available to the user to access the service A file server is a process that implements the file service 2 1
2 File Service Models Remote access model Work done at the server Consistent sharing (+) Server may be a bottleneck ( ) High communication cost ( ) Upload/download model Work done at the client Low communication cost (+) Consistency is harder to maintain ( ) 3 Server Types Stateless servers Server does not maintain any client state Client must specify location for read/write, re authenticate for each request Can easily recover from failure (no need to restore any state) Stateful servers Server provides open and close operations and maintains client state (e.g., files opened by each client, current read/write pointer for each file) Authenticate once at file open time, client does not need to specify location for read/write in request message Server must ensure that state can be recovered after a crash 4 2
3 Semantics of File Sharing UNIX semantics: A read operation returns the effect of the last write operation Can be achieved in a distributed file system if there is only one file server and clients do not cache files Session semantics: Changes to an open file are initially visible only to the process that modified the file. Only when the file is closed are the changes made visible to other processes. Most distributed file systems make use of local caches and implement session semantics What if two or more clients cache and modify the same file simultaneously? The final result depends on whose close request is most recently processed by the server 5 (a) On a single machine, when a read follows a write, the value returned by the read is the value just written. b) In a distributed system with caching, obsolete values may be returned. 6 3
4 Network File System (NFS) NFS is a distributed file system protocol developed by Sun Microsystems in 1984, allowing a user on a client computer to access files stored on a remote server much like local storage is accessed Client/server architecture Client file system requests are forwarded to a remote server File system requests are implemented as remote procedure calls (RPCs) NSF is OS independent: client and server implementations exist for almost all operating systems and platforms 7 NFS Architecture The virtual file system (VFS) layer is added to the UNIX kernel to allow applications to access different types of file systems in a uniform way VFS provides a standard file system interface, hides difference between accessing local and remote file systems The basic NFS architecture for UNIX systems 8 4
5 NFS File System Model Files are hierarchically organized into a naming graph in which nodes represent directories and files A directory file contains the mappings between file names and file handles (i.e., unique file identifiers) To access a file, a client must first look up its name and obtain the associated file handle In NSFv3, servers are stateless No open and close operations Server must check permission on each read and write call In NSFv4, servers are stateful open and close operations are provided Server checks permission at file open time 9 An incomplete list of file system operations supported by NFS 10 5
6 RPCs in NFS In NFSv3, every operation is implemented as an RPC NFSv4 supports compound procedures by which several operations can be grouped into a single RPC Better performance in wide area networks a) Reading data from a file in v3. b) Reading data using a compound procedure in v4. 11 Naming in NFS NSF provides clients transparent access to a remote file system by letting a client mount (part of) a remote file system into its own local file system A sever can export a directory (i.e., make a directory and its entries available to clients) An exported directory can be mounted into a client s local name space 12 6
7 Synchronization in NFS NFS provides two ways of synchronizing access to shared files Use locks Share reservation 13 File Locking A client can request read lock or write lock for a specific range of bytes in a file Locks are granted for a specific time, i.e., they have an associated lease When the lease on a lock expires, the server removes the lock (nonblocking) NFSV4 operations related to file locking 14 7
8 Share Reservation Share reservation is an implicit way to lock a file When a client opens a file, it specifies the type of access it requires and the type of access the server should deny other clients The open operation fails if the server cannot meet the client s requirements A share reservation is similar to a lock, except that its granularity is on an entire file, and its lifetime equals the duration of the file open 15 The result of an open operation with share reservations in NFSv4. a) When the client requests shared access given the current denial state. b) When the client requests a denial state given the current file access state. 16 8
9 Client Side Caching Client can cache data (file data, file attributes, file handles, directories) previously read from server In NFSv3, client side caching is left to implementation Most implementations never guaranteed consistency (cached data could be stale for up to 30 seconds) NSFv4 supports two different approaches for caching file data, effectively implementing the upload/download model of file service Implementing session semantics Open delegation 17 Implementing Session Semantics After a client opens a file, it caches the data it obtains from the server as the result of various read operations Write operations can be carried out in the cache Modified data in the cache must be flushed back to the server when the file is closed When a client opens a previously closed file that has been (partly) cached, the client must revalidate the cached data by checking when the file was last modified The cache is invalidated if it contains stale data 18 9
10 Open Delegation Delegation is a technique by which the server delegates the management of a file to a client At OPEN, the server may provide the client either a read or write delegation for the file If granted a read delegation, the client is assured that no other client has the ability to write to the file for the duration of the delegation (Read delegations can be granted to multiple clients at the same time) If granted a write delegation, the client is assured that no other client has read or write access to the file (A write delegation can be granted to only one client) While holding a delegation, the client handles various operations (OPEN, CLOSE, READ, WRITE, LOCK, LOCKU) locally without sending them to the server This greatly reduces the interactions between the server and the client for delegated files, leading to better performance in wide area networks 19 Callbacks If another client requests access to the file that conflicts with the granted delegation, the server contacts the initial client and recalls the delegation Upon return of the delegation, the server will centrally manage various file operations Server uses a callback mechanism to recall the delegation A callback is an RPC from the server to the client Server must keep track of clients to which it has delegated a file 20 10
Distributed File Systems. NFS Architecture (1)
COP 6611 Advanced Operating System Distributed File Systems Chi Zhang czhang@cs.fiu.edu NFS Architecture (1) a) The remote access model. (like NFS) b) The upload/download model (like FTP) 2 1 NFS Architecture
More informationLast class: Distributed File Systems. Today: NFS, Coda
Last class: Distributed File Systems Issues in distributed file systems Sun s Network File System case study Lecture 19, page 1 Today: NFS, Coda Case Study: NFS (continued) Case Study: Coda File System
More informationDistributed File Systems. Chapter 10
Distributed File Systems Chapter 10 Distributed File System a) A distributed file system is a file system that resides on different machines, but offers an integrated view of data stored on remote disks.
More informationWe mean.network File System
We mean.network File System Introduction: Remote File-systems When networking became widely available users wanting to share files had to log in across the net to a central machine This central machine
More informationNetwork File System (NFS) Pradipta De pradipta.de@sunykorea.ac.kr
Network File System (NFS) Pradipta De pradipta.de@sunykorea.ac.kr Today s Topic Network File System Type of Distributed file system NFS protocol NFS cache consistency issue CSE506: Ext Filesystem 2 NFS
More informationCOSC 6374 Parallel Computation. Parallel I/O (I) I/O basics. Concept of a clusters
COSC 6374 Parallel I/O (I) I/O basics Fall 2012 Concept of a clusters Processor 1 local disks Compute node message passing network administrative network Memory Processor 2 Network card 1 Network card
More informationCOSC 6374 Parallel Computation. Parallel I/O (I) I/O basics. Concept of a clusters
COSC 6374 Parallel Computation Parallel I/O (I) I/O basics Spring 2008 Concept of a clusters Processor 1 local disks Compute node message passing network administrative network Memory Processor 2 Network
More informationChapter 11: File System Implementation. Operating System Concepts with Java 8 th Edition
Chapter 11: File System Implementation 11.1 Silberschatz, Galvin and Gagne 2009 Chapter 11: File System Implementation File-System Structure File-System Implementation Directory Implementation Allocation
More informationNetwork Attached Storage. Jinfeng Yang Oct/19/2015
Network Attached Storage Jinfeng Yang Oct/19/2015 Outline Part A 1. What is the Network Attached Storage (NAS)? 2. What are the applications of NAS? 3. The benefits of NAS. 4. NAS s performance (Reliability
More informationNetwork File System (NFS)
Network File System (NFS) Brad Karp UCL Computer Science CS GZ03 / M030 10 th October 2011 NFS Is Relevant Original paper from 1985 Very successful, still widely used today Early result; much subsequent
More informationDistributed File Systems
Distributed File Systems Paul Krzyzanowski Rutgers University October 28, 2012 1 Introduction The classic network file systems we examined, NFS, CIFS, AFS, Coda, were designed as client-server applications.
More informationDistributed File Systems
Distributed File Systems File Characteristics From Andrew File System work: most files are small transfer files rather than disk blocks? reading more common than writing most access is sequential most
More informationOPERATING SYSTEMS FILE SYSTEMS
OPERATING SYSTEMS FILE SYSTEMS Jerry Breecher 10: File Systems 1 FILE SYSTEMS This material covers Silberschatz Chapters 10 and 11. File System Interface The user level (more visible) portion of the file
More informationFour Reasons To Start Working With NFSv4.1 Now
Four Reasons To Start Working With NFSv4.1 Now PRESENTATION TITLE GOES HERE Presented by: Alex McDonald Hosted by: Gilles Chekroun Ethernet Storage Forum Members The SNIA Ethernet Storage Forum (ESF) focuses
More informationLast Class: Communication in Distributed Systems. Today: Remote Procedure Calls
Last Class: Communication in Distributed Systems Structured or unstructured? Addressing? Blocking/non-blocking? Buffered or unbuffered? Reliable or unreliable? Server architecture Scalability Push or pull?
More informationSunita Suralkar, Ashwini Mujumdar, Gayatri Masiwal, Manasi Kulkarni Department of Computer Technology, Veermata Jijabai Technological Institute
Review of Distributed File Systems: Case Studies Sunita Suralkar, Ashwini Mujumdar, Gayatri Masiwal, Manasi Kulkarni Department of Computer Technology, Veermata Jijabai Technological Institute Abstract
More informationDistributed File System Choices: Red Hat Storage, GFS2 & pnfs
Distributed File System Choices: Red Hat Storage, GFS2 & pnfs Ric Wheeler Architect & Senior Manager, Red Hat June 27, 2012 Overview Distributed file system basics Red Hat distributed file systems Performance
More informationCHAPTER 6: DISTRIBUTED FILE SYSTEMS
CHAPTER 6: DISTRIBUTED FILE SYSTEMS Chapter outline DFS design and implementation issues: system structure, access, and sharing semantics Transaction and concurrency control: serializability and concurrency
More informationChapter 11: File System Implementation. Operating System Concepts 8 th Edition
Chapter 11: File System Implementation Operating System Concepts 8 th Edition Silberschatz, Galvin and Gagne 2009 Chapter 11: File System Implementation File-System Structure File-System Implementation
More informationDistributed File Systems Part I. Issues in Centralized File Systems
Distributed File Systems Part I Daniel A. Menascé File Naming Issues in Centralized File Systems c:\courses\cs571\procs.ps (MS-DOS) /usr/menasce/courses/cs571/processes.ps (UNIX) File Structure bitstream
More informationUSING USER ACCESS CONTROL LISTS (ACLS) TO MANAGE FILE PERMISSIONS WITH A LENOVO NETWORK STORAGE DEVICE
White Paper USING USER ACCESS CONTROL LISTS (ACLS) TO MANAGE FILE PERMISSIONS WITH A LENOVO NETWORK STORAGE DEVICE CONTENTS Executive Summary 1 Introduction 1 Audience 2 Terminology 2 Windows Concepts
More informationDesigning an NFS-based Mobile Distributed File System for Ephemeral Sharing in Proximity Networks
Designing an NFS-based Mobile Distributed File System for Ephemeral Sharing in Proximity Networks Nikolaos Michalakis Computer Science Department New York University, New York, NY Dimitris Kalofonos Pervasive
More informationWhy is it a better NFS server for Enterprise NAS?
NFS-Ganesha Why is it a better NFS server for Enterprise NAS? Venkateswararao Jujjuri (JV) File systems and Storage Architect IBM Linux Technology center jvrao@us.ibm.com jujjuri@gmail.com Outline What
More informationWeb Email DNS Peer-to-peer systems (file sharing, CDNs, cycle sharing)
1 1 Distributed Systems What are distributed systems? How would you characterize them? Components of the system are located at networked computers Cooperate to provide some service No shared memory Communication
More informationDistributed Systems. REK s adaptation of Prof. Claypool s adaptation of Tanenbaum s Distributed Systems Chapter 1
Distributed Systems REK s adaptation of Prof. Claypool s adaptation of Tanenbaum s Distributed Systems Chapter 1 1 The Rise of Distributed Systems! Computer hardware prices are falling and power increasing.!
More informationOperating Systems. 07.02 File system mounting, sharing, and protection. File System Mounting
07.02 File system mounting, sharing, and protection emanuele lattanzi isti information science and technology institute 1/15 File System Mounting A file system must be mounted before it can be accessed
More informationIntroduction to Highly Available NFS Server on scale out storage systems based on GlusterFS
Introduction to Highly Available NFS Server on scale out storage systems based on GlusterFS Soumya Koduri Red Hat Meghana Madhusudhan Red Hat AGENDA What is GlusterFS? Integration with NFS Ganesha Clustered
More informationSOFT 437. Software Performance Analysis. Ch 5:Web Applications and Other Distributed Systems
SOFT 437 Software Performance Analysis Ch 5:Web Applications and Other Distributed Systems Outline Overview of Web applications, distributed object technologies, and the important considerations for SPE
More informationImplementing the Hadoop Distributed File System Protocol on OneFS Jeff Hughes EMC Isilon
Implementing the Hadoop Distributed File System Protocol on OneFS Jeff Hughes EMC Isilon Outline Hadoop Overview OneFS Overview MapReduce + OneFS Details of isi_hdfs_d Wrap up & Questions 2 Hadoop Overview
More informationCHAPTER 2 MODELLING FOR DISTRIBUTED NETWORK SYSTEMS: THE CLIENT- SERVER MODEL
CHAPTER 2 MODELLING FOR DISTRIBUTED NETWORK SYSTEMS: THE CLIENT- SERVER MODEL This chapter is to introduce the client-server model and its role in the development of distributed network systems. The chapter
More informationNFS File Sharing. Peter Lo. CP582 Peter Lo 2003 1
NFS File Sharing Peter Lo CP582 Peter Lo 2003 1 NFS File Sharing Summary Distinguish between: File transfer Entire file is copied to new location FTP Copy command File sharing Multiple users can access
More informationTransparency in Distributed Systems
Transparency in Distributed Systems By Sudheer R Mantena Abstract The present day network architectures are becoming more and more complicated due to heterogeneity of the network components and mainly
More informationHow To Write A Network Operating System For A Network (Networking) System (Netware)
Otwarte Studium Doktoranckie 1 Adaptable Service Oriented Architectures Krzysztof Zieliński Department of Computer Science AGH-UST Krakow Poland Otwarte Studium Doktoranckie 2 Agenda DCS SOA WS MDA OCL
More informationSeminar Presentation for ECE 658 Instructed by: Prof.Anura Jayasumana Distributed File Systems
Seminar Presentation for ECE 658 Instructed by: Prof.Anura Jayasumana Distributed File Systems Prabhakaran Murugesan Outline File Transfer Protocol (FTP) Network File System (NFS) Andrew File System (AFS)
More informationConfiguring Apache Derby for Performance and Durability Olav Sandstå
Configuring Apache Derby for Performance and Durability Olav Sandstå Database Technology Group Sun Microsystems Trondheim, Norway Overview Background > Transactions, Failure Classes, Derby Architecture
More informationSecurity and Integrity of a Distributed File Storage in a Virtual Environment
Security and Integrity of a Distributed File Storage in a Virtual Environment Gaspare Sala 1 Daniele Sgandurra 1 Fabrizio Baiardi 2 1 Department of Computer Science, University of Pisa, Italy 2 Polo G.
More informationCoda: A Highly Available File System for a Distributed Workstation Environment
Coda: A Highly Available File System for a Distributed Workstation Environment M. Satyanarayanan School of Computer Science Carnegie Mellon University Abstract Coda is a file system for a large-scale distributed
More informationNaming. Name Service. Why Name Services? Mappings. and related concepts
Service Processes and Threads: execution of applications or services Communication: information exchange for coordination of processes But: how can client processes (or human users) find the right server
More informationProject Group High- performance Flexible File System
Project Group High- performance Flexible File System Lecture 3: Network File Systems André Brinkmann Example: SUN NFS NFS (Network File System) is an open protocol to exchange files Developed by Sun Microsystems
More informationDistributed File Systems
Distributed File Systems Mauro Fruet University of Trento - Italy 2011/12/19 Mauro Fruet (UniTN) Distributed File Systems 2011/12/19 1 / 39 Outline 1 Distributed File Systems 2 The Google File System (GFS)
More informationOpen Source, Scale-out clustered NAS using nfs-ganesha and GlusterFS
Open Source, Scale-out clustered NAS using nfs-ganesha and GlusterFS Anand Subramanian Senior Principal Engineer, Red Hat anands@redhat.com Agenda Introduction GlusterFS NFSv4 nfs-ganesha Nfs-ganesha Architecture
More informationFile Systems for Clusters from a Protocol Perspective
File Systems for Clusters from a Protocol Perspective Peter J. Braam School of Computer Science Carnegie Mellon University Abstract: The protocols used by distributed file systems vary widely. The aim
More informationData Management in an International Data Grid Project. Timur Chabuk 04/09/2007
Data Management in an International Data Grid Project Timur Chabuk 04/09/2007 Intro LHC opened in 2005 several Petabytes of data per year data created at CERN distributed to Regional Centers all over the
More information10.2 THE CODA FILE SYSTEM
604 DISTRIBUTED FILE SYSTEMS CHAP. 10 10.2 THE CODA FILE SYSTEM Our next example of a distributed file system is Coda. Coda has been developed at Carnegie Mellon University (CMU) in the 1990s, and is now
More informationChapter 2: Remote Procedure Call (RPC)
Chapter 2: Remote Procedure Call (RPC) Gustavo Alonso Computer Science Department Swiss Federal Institute of Technology (ETHZ) alonso@inf.ethz.ch http://www.iks.inf.ethz.ch/ Contents - Chapter 2 - RPC
More informationTechnical Brief: Global File Locking
Nasuni enables collaboration among users of files no matter where users are located Introduction The Nasuni Service combines the availability and scale of cloud storage with the local performance found
More informationSwiss Cyber Storm II Case: NFS Hacking
Swiss Cyber Storm II Case: NFS Hacking Axel Neumann Compass Security AG Glärnischstrasse 7 Postfach 1628 CH-8640 Rapperswil Tel +41 55-214 41 60 Fax +41 55-214 41 61 team@csnc.ch
More informationDistributed File Systems Design
Introduction Lectures on distributed systems Distributed File Systems Design Paul Krzyzanowski Presently, our most common exposure to distributed systems that exemplify some degree of transparency is through
More informationClient/Server and Distributed Computing
Adapted from:operating Systems: Internals and Design Principles, 6/E William Stallings CS571 Fall 2010 Client/Server and Distributed Computing Dave Bremer Otago Polytechnic, N.Z. 2008, Prentice Hall Traditional
More informationHow To Understand The Concept Of A Distributed System
Distributed Operating Systems Introduction Ewa Niewiadomska-Szynkiewicz and Adam Kozakiewicz ens@ia.pw.edu.pl, akozakie@ia.pw.edu.pl Institute of Control and Computation Engineering Warsaw University of
More informationApplication Persistence. High-Availability. White Paper
Application Persistence High-Availability White Paper Introduction Highly available solutions remove single points of failure (SPOFs) and this creates an environment in which users can have near continuous
More informationHow To Write A Windows Operating System (Windows) (For Linux) (Windows 2) (Programming) (Operating System) (Permanent) (Powerbook) (Unix) (Amd64) (Win2) (X
(Advanced Topics in) Operating Systems Winter Term 2009 / 2010 Jun.-Prof. Dr.-Ing. André Brinkmann brinkman@upb.de Universität Paderborn PC 1 Overview Overview of chapter 3: Case Studies 3.1 Windows Architecture.....3
More informationDistributed File Systems
Distributed File Systems 1 Topics Introduction File Service Architecture DFS: Case Studies Case Study: Sun NFS Case Study: Hadoop HDFS 2 Introduction File system were originally developed for centralized
More informationConfiguring Apache Derby for Performance and Durability Olav Sandstå
Configuring Apache Derby for Performance and Durability Olav Sandstå Sun Microsystems Trondheim, Norway Agenda Apache Derby introduction Performance and durability Performance tips Open source database
More informationClient/Server Computing Distributed Processing, Client/Server, and Clusters
Client/Server Computing Distributed Processing, Client/Server, and Clusters Chapter 13 Client machines are generally single-user PCs or workstations that provide a highly userfriendly interface to the
More informationChapter 11 I/O Management and Disk Scheduling
Operating Systems: Internals and Design Principles, 6/E William Stallings Chapter 11 I/O Management and Disk Scheduling Dave Bremer Otago Polytechnic, NZ 2008, Prentice Hall I/O Devices Roadmap Organization
More informationQuick Start - NetApp File Archiver
Quick Start - NetApp File Archiver TABLE OF CONTENTS OVERVIEW SYSTEM REQUIREMENTS GETTING STARTED Upgrade Configuration Archive Recover Page 1 of 14 Overview - NetApp File Archiver Agent TABLE OF CONTENTS
More informationLehrstuhl für Informatik 4 Kommunikation und verteilte Systeme. Middleware. Chapter 8: Middleware
Middleware 1 Middleware Lehrstuhl für Informatik 4 Middleware: Realisation of distributed accesses by suitable software infrastructure Hiding the complexity of the distributed system from the programmer
More informationB) Using Processor-Cache Affinity Information in Shared Memory Multiprocessor Scheduling
A) Recovery Management in Quicksilver 1) What role does the Transaction manager play in the recovery management? It manages commit coordination by communicating with servers at its own node and with transaction
More informationCray DVS: Data Virtualization Service
Cray : Data Virtualization Service Stephen Sugiyama and David Wallace, Cray Inc. ABSTRACT: Cray, the Cray Data Virtualization Service, is a new capability being added to the XT software environment with
More informationPrinciples and characteristics of distributed systems and environments
Principles and characteristics of distributed systems and environments Definition of a distributed system Distributed system is a collection of independent computers that appears to its users as a single
More informationAgenda. Distributed System Structures. Why Distributed Systems? Motivation
Agenda Distributed System Structures CSCI 444/544 Operating Systems Fall 2008 Motivation Network structure Fundamental network services Sockets and ports Client/server model Remote Procedure Call (RPC)
More informationTHE BCS PROFESSIONAL EXAMINATIONS BCS Level 6 Professional Graduate Diploma in IT. April 2009 EXAMINERS' REPORT. Network Information Systems
THE BCS PROFESSIONAL EXAMINATIONS BCS Level 6 Professional Graduate Diploma in IT April 2009 EXAMINERS' REPORT Network Information Systems General Comments Last year examiners report a good pass rate with
More informationUNISOL SysAdmin. SysAdmin helps systems administrators manage their UNIX systems and networks more effectively.
1. UNISOL SysAdmin Overview SysAdmin helps systems administrators manage their UNIX systems and networks more effectively. SysAdmin is a comprehensive system administration package which provides a secure
More informationSoftware Concepts. Uniprocessor Operating Systems. System software structures. CIS 505: Software Systems Architectures of Distributed Systems
CIS 505: Software Systems Architectures of Distributed Systems System DOS Software Concepts Description Tightly-coupled operating system for multiprocessors and homogeneous multicomputers Main Goal Hide
More informationThe Google File System
The Google File System Motivations of NFS NFS (Network File System) Allow to access files in other systems as local files Actually a network protocol (initially only one server) Simple and fast server
More informationSerNet. Clustered Samba. Nürnberg April 29, 2009. Volker Lendecke SerNet Samba Team. Network Service in a Service Network
Clustered Samba Nürnberg April 29, 2009 Volker Lendecke SerNet Samba Team 04/2009, Volker Lendecke, SerNet Service Network GmbH, Seite 1 Volker Lendecke Co-founder SerNet - Service Network GmbH Free Software
More informationSymantec Enterprise Security Manager Baseline Policy Manual for CIS Benchmark
Symantec Enterprise Security Manager Baseline Policy Manual for CIS Benchmark For Windows Server 2008 Domain Controllers Version: 3.0.0 Symantec Enterprise Security Manager Baseline Policy Manual for
More informationErlang Distributed File System (edfs)
Indian Institute of Technology Bombay CS 492 : BTP Stage I Erlang Distributed File System (edfs) By: Aman Mangal (100050015) Coordinator: Prof. G. Sivakumar November 30, 2013 Contents Abstract 3 1 Introduction
More informationAN EXPERIMENTAL COMPARISON OF REMOTE PROCEDURE CALL AND GROUP COMMUNICATION
AN EXPERIMENTAL COMPARISON OF REMOTE PROCEDURE CALL AND GROUP COMMUNICATION M. Frans Kaashoek Andrew S. Tanenbaum Kees Verstoep ABSTRACT This paper suggests that a distributed system should support two
More informationSecure data storage. André Zúquete Security 1
Secure data storage André Zúquete Security 1 Problems (1/3) ( The classical file system protection is limited Physical protection assumptions Physical confinement of storage devices Logical protection
More informationRAID Storage, Network File Systems, and DropBox
RAID Storage, Network File Systems, and DropBox George Porter CSE 124 February 24, 2015 * Thanks to Dave Patterson and Hong Jiang Announcements Project 2 due by end of today Office hour today 2-3pm in
More informationNetapp @ 10th TF-Storage Meeting
Netapp @ 10th TF-Storage Meeting Wojciech Janusz, Netapp Poland Bogusz Błaszkiewicz, Netapp Poland Ljubljana, 2012.02.20 Agenda Data Ontap Cluster-Mode pnfs E-Series NetApp Confidential - Internal Use
More informationSiliconServer Data Sharing and Security White Paper
SiliconServer Data Sharing and Security White Paper Executive Summary The ability of enterprises to access UNIX and Windows NT stored data both separately and from a shared common pool is growing in importance.
More informationCloud Based Application Architectures using Smart Computing
Cloud Based Application Architectures using Smart Computing How to Use this Guide Joyent Smart Technology represents a sophisticated evolution in cloud computing infrastructure. Most cloud computing products
More informationA COMPARISON BETWEEN THE SAMBA3 AND LIKEWISE LWIOD FILE SERVERS
A COMPARISON BETWEEN THE SAMBA3 AND LIKEWISE LWIOD FILE SERVERS May 7, 2010 Outline Overview Architecture Feature Set Administrator Perspective Developer Perspective Overview 18 years development GPLv3
More informationSurvey of Filesystems for Embedded Linux. Presented by Gene Sally CELF
Survey of Filesystems for Embedded Linux Presented by Gene Sally CELF Presentation Filesystems In Summary What is a filesystem Kernel and User space filesystems Picking a root filesystem Filesystem Round-up
More informationDistributed Systems [Fall 2012]
Distributed Systems [Fall 2012] [W4995-2] Lec 6: YFS Lab Introduction and Local Synchronization Primitives Slide acks: Jinyang Li, Dave Andersen, Randy Bryant (http://www.news.cs.nyu.edu/~jinyang/fa10/notes/ds-lec2.ppt,
More informationHow To Make A Distributed System Transparent
Operating Systems Interface between the hardware and the rest: editors, compilers, database systems, application programs, your programs, etc. Allows portability, enables easier programming, The manager
More informationIt is the thinnest layer in the OSI model. At the time the model was formulated, it was not clear that a session layer was needed.
Session Layer The session layer resides above the transport layer, and provides value added services to the underlying transport layer services. The session layer (along with the presentation layer) add
More informationFile Transfer And Access (FTP, TFTP, NFS) Chapter 25 By: Sang Oh Spencer Kam Atsuya Takagi
File Transfer And Access (FTP, TFTP, NFS) Chapter 25 By: Sang Oh Spencer Kam Atsuya Takagi History of FTP The first proposed file transfer mechanisms were developed for implementation on hosts at M.I.T.
More informationCheckPoint FireWall-1 Version 3.0 Highlights Contents
CheckPoint FireWall-1 Version 3.0 Highlights Contents Abstract...2 Active Network Management...3 Accounting... 3 Live Connections Report... 3 Load balancing... 3 Exporting log records to Informix database...
More informationDr Markus Hagenbuchner markus@uow.edu.au CSCI319. Distributed Systems
Dr Markus Hagenbuchner markus@uow.edu.au CSCI319 Distributed Systems CSCI319 Chapter 8 Page: 1 of 61 Fault Tolerance Study objectives: Understand the role of fault tolerance in Distributed Systems. Know
More informationA distributed system is defined as
A distributed system is defined as A collection of independent computers that appears to its users as a single coherent system CS550: Advanced Operating Systems 2 Resource sharing Openness Concurrency
More informationExo-leasing: Escrow Synchronization for Mobile Clients of Commodity Storage Servers
Exo-leasing: Escrow Synchronization for Mobile Clients of Commodity Storage Servers Liuba Shrira 1, Hong Tian 2, and Doug Terry 3 1 Brandeis University 2 Amazon.com 3 Microsoft Research Abstract. Escrow
More informationHow To Manage File Access On Data Ontap On A Pc Or Mac Or Mac (For A Mac) On A Network (For Mac) With A Network Or Ipad (For An Ipad) On An Ipa (For Pc Or
Clustered Data ONTAP 8.3 File Access Management Guide for NFS NetApp, Inc. 495 East Java Drive Sunnyvale, CA 94089 U.S. Telephone: +1 (408) 822-6000 Fax: +1 (408) 822-4501 Support telephone: +1 (888) 463-8277
More informationA DISTRIBUTED FILE SYSTEM (DFS)
A DISTRIBUTED FILE SYSTEM (DFS) By PRASHANT JAYARAMAN A THESIS PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE
More informationDistributed Systems. Security concepts; Cryptographic algorithms; Digital signatures; Authentication; Secure Sockets
I. Introduction II. Fundamental Concepts of Architecture models; network architectures: OSI, Internet and LANs; interprocess communication III. Time and Global States Clocks and concepts of time; Event
More informationNFSv4.1 Server Protocol Compliance, Security, Performance and Scalability Testing - Implement RFC, Going Beyond POSIX Interop!
Server Protocol Compliance, Security, Performance and Scalability Testing - Implement RFC, Going Beyond POSIX Interop! Raymond Wang, Tanmay Waghmare Microsoft Corporation Agenda Key Learning Points Why
More informationDistributed Objects and Components
Distributed Objects and Components Introduction This essay will identify the differences between objects and components and what it means for a component to be distributed. It will also examine the Java
More informationLecture on Storage Systems
Lecture on Storage Systems Network File Systems André Brinkmann Network File Systems Distributed File Systems NFS AFS Network A
More informationMigrating from NFSv3 to NFSv4. Migrating from NFSv3 to NFSv4. March 2011. 1 of 10 2011 STORAGE NETWORKING INDUSTRY ASSOCIATION
Migrating from NFSv3 to NFSv4 Migrating from NFSv3 to NFSv4 March 2011 1 of 10 Table of Contents Introduction... 3 NFSv3 to NFSv4 Considerations... 4 Pseudo Filesystem...4 TCP only; no UDP support...5
More informationImplementing Network Attached Storage. Ken Fallon Bill Bullers Impactdata
Implementing Network Attached Storage Ken Fallon Bill Bullers Impactdata Abstract The Network Peripheral Adapter (NPA) is an intelligent controller and optimized file server that enables network-attached
More informationNFS Ganesha and Clustered NAS on Distributed Storage System, GlusterFS. Soumya Koduri Meghana Madhusudhan Red Hat
NFS Ganesha and Clustered NAS on Distributed Storage System, GlusterFS Soumya Koduri Meghana Madhusudhan Red Hat AGENDA NFS( Ganesha) Distributed storage system GlusterFS Integration Clustered NFS Future
More informationThe Evolution of File Systems How the Digital World Manages its Data
The Evolution of File Systems How the Digital World Manages its Data Christian Bandulet, Principal Engineer, Sun Microsystems SNIA Tutorial Basics Table of Contents Abstract...1 Basic Architecture of Open
More informationTools Page 1 of 13 ON PROGRAM TRANSLATION. A priori, we have two translation mechanisms available:
Tools Page 1 of 13 ON PROGRAM TRANSLATION A priori, we have two translation mechanisms available: Interpretation Compilation On interpretation: Statements are translated one at a time and executed immediately.
More informationChapter 12 File Management
Operating Systems: Internals and Design Principles, 6/E William Stallings Chapter 12 File Management Dave Bremer Otago Polytechnic, N.Z. 2008, Prentice Hall Roadmap Overview File organisation and Access
More informationChapter 12 File Management. Roadmap
Operating Systems: Internals and Design Principles, 6/E William Stallings Chapter 12 File Management Dave Bremer Otago Polytechnic, N.Z. 2008, Prentice Hall Overview Roadmap File organisation and Access
More informationCS 416: Opera-ng Systems Design
Question 1 Explain the major difference between a file system that supports journaling (e.g., Linux ext4) versus a log-structured file system (e.g., YAFFS2). Operating Systems 2015 Exam 3 Review Paul Krzyzanowski
More information