Distributed File Systems Introduction File System Modules File Attribute
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NTFS • Windows Reinstallation – Bypass ACL • Administrators Privilege – Bypass Ownership
Windows Encrypting File System Motivation • Laptops are very integrated in enterprises… • Stolen/lost computers loaded with confidential/business data • Data Privacy Issues • Offline Access – Bypass NTFS • Windows reinstallation – Bypass ACL • Administrators privilege – Bypass Ownership www.winitor.com 01 March 2010 Windows Encrypting File System Mechanism • Principle • A random - unique - symmetric key encrypts the data • An asymmetric key encrypts the symmetric key used to encrypt the data • Combination of two algorithms • Use their strengths • Minimize their weaknesses • Results • Increased performance • Increased security Asymetric Symetric Data www.winitor.com 01 March 2010 Windows Encrypting File System Characteristics • Confortable • Applying encryption is just a matter of assigning a file attribute www.winitor.com 01 March 2010 Windows Encrypting File System Characteristics • Transparent • Integrated into the operating system • Transparent to (valid) users/applications Application Win32 Crypto Engine NTFS EFS &.[ßl}d.,*.c§4 $5%2=h#<.. www.winitor.com 01 March 2010 Windows Encrypting File System Characteristics • Flexible • Supported at different scopes • File, Directory, Drive (Vista?) • Files can be shared between any number of users • Files can be stored anywhere • local, remote, WebDav • Files can be offline • Secure • Encryption and Decryption occur in kernel mode • Keys are never paged • Usage of standardized cryptography services www.winitor.com 01 March 2010 Windows Encrypting File System Availibility • At the GUI, the availibility -
STAT 625: Statistical Case Studies 1 Our Computing Environment(S)
John W. Emerson, Department of Statistics, Yale University © 2013 1 STAT 625: Statistical Case Studies John W. Emerson Yale University Abstract This term, I’ll generally present brief class notes and scripts, but much of the lecture material will simply be presented in class and/or available online. However, student participation is a large part of this course, and at any time I may call upon any of you to share some of your work. Be prepared. This won’t be a class where you sit and absorb material. I strongly encourage you to work with other students; you can learn a lot from each other. To get anything out of this course you’ll need to put in the time for the sake of learning and strengthening your skills, not for the sake of jumping through the proverbial hoop. Lesson 1: Learning how to communicate. This document was created using LATEX and Sweave (which is really an R package). There are some huge advantages to a workflow like this, relating to a topic called reproducible research. Here’s my thought: pay your dues now, reap the benefits later. Don’t trust me on everything, but trust me on this. A sister document was created using R Markdown and the markdown package, and this is also acceptable. Microsoft Office is not. So, in today’s class I’ll show you how I produced these documents and I’ll give you the required files. I recommend you figure out how to use LATEX on your own computer. You already have Sweave, because it comes with R. -
System Calls and I/O
System Calls and I/O CS 241 January 27, 2012 Copyright ©: University of Illinois CS 241 Staff 1 This lecture Goals Get you familiar with necessary basic system & I/O calls to do programming Things covered in this lecture Basic file system calls I/O calls Signals Note: we will come back later to discuss the above things at the concept level Copyright ©: University of Illinois CS 241 Staff 2 System Calls versus Function Calls? Copyright ©: University of Illinois CS 241 Staff 3 System Calls versus Function Calls Function Call Process fnCall() Caller and callee are in the same Process - Same user - Same “domain of trust” Copyright ©: University of Illinois CS 241 Staff 4 System Calls versus Function Calls Function Call System Call Process Process fnCall() sysCall() OS Caller and callee are in the same Process - Same user - OS is trusted; user is not. - Same “domain of trust” - OS has super-privileges; user does not - Must take measures to prevent abuse Copyright ©: University of Illinois CS 241 Staff 5 System Calls System Calls A request to the operating system to perform some activity System calls are expensive The system needs to perform many things before executing a system call The computer (hardware) saves its state The OS code takes control of the CPU, privileges are updated. The OS examines the call parameters The OS performs the requested function The OS saves its state (and call results) The OS returns control of the CPU to the caller Copyright ©: University of Illinois CS 241 Staff 6 Steps for Making a System Call -
Enhancing the Accuracy of Synthetic File System Benchmarks Salam Farhat Nova Southeastern University, [email protected]
Nova Southeastern University NSUWorks CEC Theses and Dissertations College of Engineering and Computing 2017 Enhancing the Accuracy of Synthetic File System Benchmarks Salam Farhat Nova Southeastern University, [email protected] This document is a product of extensive research conducted at the Nova Southeastern University College of Engineering and Computing. For more information on research and degree programs at the NSU College of Engineering and Computing, please click here. Follow this and additional works at: https://nsuworks.nova.edu/gscis_etd Part of the Computer Sciences Commons Share Feedback About This Item NSUWorks Citation Salam Farhat. 2017. Enhancing the Accuracy of Synthetic File System Benchmarks. Doctoral dissertation. Nova Southeastern University. Retrieved from NSUWorks, College of Engineering and Computing. (1003) https://nsuworks.nova.edu/gscis_etd/1003. This Dissertation is brought to you by the College of Engineering and Computing at NSUWorks. It has been accepted for inclusion in CEC Theses and Dissertations by an authorized administrator of NSUWorks. For more information, please contact [email protected]. Enhancing the Accuracy of Synthetic File System Benchmarks by Salam Farhat A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor in Philosophy in Computer Science College of Engineering and Computing Nova Southeastern University 2017 We hereby certify that this dissertation, submitted by Salam Farhat, conforms to acceptable standards and is fully adequate in scope and quality to fulfill the dissertation requirements for the degree of Doctor of Philosophy. _____________________________________________ ________________ Gregory E. Simco, Ph.D. Date Chairperson of Dissertation Committee _____________________________________________ ________________ Sumitra Mukherjee, Ph.D. Date Dissertation Committee Member _____________________________________________ ________________ Francisco J. -
Active @ UNDELETE Users Guide | TOC | 2
Active @ UNDELETE Users Guide | TOC | 2 Contents Legal Statement..................................................................................................4 Active@ UNDELETE Overview............................................................................. 5 Getting Started with Active@ UNDELETE........................................................... 6 Active@ UNDELETE Views And Windows......................................................................................6 Recovery Explorer View.................................................................................................... 7 Logical Drive Scan Result View.......................................................................................... 7 Physical Device Scan View................................................................................................ 8 Search Results View........................................................................................................10 Application Log...............................................................................................................11 Welcome View................................................................................................................11 Using Active@ UNDELETE Overview................................................................. 13 Recover deleted Files and Folders.............................................................................................. 14 Scan a Volume (Logical Drive) for deleted files..................................................................15 -
File Manager Manual
FileManager Operations Guide for Unisys MCP Systems Release 9.069W November 2017 Copyright This document is protected by Federal Copyright Law. It may not be reproduced, transcribed, copied, or duplicated by any means to or from any media, magnetic or otherwise without the express written permission of DYNAMIC SOLUTIONS INTERNATIONAL, INC. It is believed that the information contained in this manual is accurate and reliable, and much care has been taken in its preparation. However, no responsibility, financial or otherwise, can be accepted for any consequence arising out of the use of this material. THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE PROGRAM SPECIFICATION. Correspondence regarding this document should be addressed to: Dynamic Solutions International, Inc. Product Development Group 373 Inverness Parkway Suite 110, Englewood, Colorado 80112 (800)641-5215 or (303)754-2000 Technical Support Hot-Line (800)332-9020 E-Mail: [email protected] ii November 2017 Contents ................................................................................................................................ OVERVIEW .......................................................................................................... 1 FILEMANAGER CONSIDERATIONS................................................................... 3 FileManager File Tracking ................................................................................................ 3 File Recovery .................................................................................................................... -
[13주차] Sysfs and Procfs
1 7 Computer Core Practice1: Operating System Week13. sysfs and procfs Jhuyeong Jhin and Injung Hwang Embedded Software Lab. Embedded Software Lab. 2 sysfs 7 • A pseudo file system provided by the Linux kernel. • sysfs exports information about various kernel subsystems, HW devices, and associated device drivers to user space through virtual files. • The mount point of sysfs is usually /sys. • sysfs abstrains devices or kernel subsystems as a kobject. Embedded Software Lab. 3 How to create a file in /sys 7 1. Create and add kobject to the sysfs 2. Declare a variable and struct kobj_attribute – When you declare the kobj_attribute, you should implement the functions “show” and “store” for reading and writing from/to the variable. – One variable is one attribute 3. Create a directory in the sysfs – The directory have attributes as files • When the creation of the directory is completed, the directory and files(attributes) appear in /sys. • Reference: ${KERNEL_SRC_DIR}/include/linux/sysfs.h ${KERNEL_SRC_DIR}/fs/sysfs/* • Example : ${KERNEL_SRC_DIR}/kernel/ksysfs.c Embedded Software Lab. 4 procfs 7 • A special filesystem in Unix-like operating systems. • procfs presents information about processes and other system information in a hierarchical file-like structure. • Typically, it is mapped to a mount point named /proc at boot time. • procfs acts as an interface to internal data structures in the kernel. The process IDs of all processes in the system • Kernel provides a set of functions which are designed to make the operations for the file in /proc : “seq_file interface”. – We will create a file in procfs and print some data from data structure by using this interface. -
Your Performance Task Summary Explanation
Lab Report: 11.2.5 Manage Files Your Performance Your Score: 0 of 3 (0%) Pass Status: Not Passed Elapsed Time: 6 seconds Required Score: 100% Task Summary Actions you were required to perform: In Compress the D:\Graphics folderHide Details Set the Compressed attribute Apply the changes to all folders and files In Hide the D:\Finances folder In Set Read-only on filesHide Details Set read-only on 2017report.xlsx Set read-only on 2018report.xlsx Do not set read-only for the 2019report.xlsx file Explanation In this lab, your task is to complete the following: Compress the D:\Graphics folder and all of its contents. Hide the D:\Finances folder. Make the following files Read-only: D:\Finances\2017report.xlsx D:\Finances\2018report.xlsx Complete this lab as follows: 1. Compress a folder as follows: a. From the taskbar, open File Explorer. b. Maximize the window for easier viewing. c. In the left pane, expand This PC. d. Select Data (D:). e. Right-click Graphics and select Properties. f. On the General tab, select Advanced. g. Select Compress contents to save disk space. h. Click OK. i. Click OK. j. Make sure Apply changes to this folder, subfolders and files is selected. k. Click OK. 2. Hide a folder as follows: a. Right-click Finances and select Properties. b. Select Hidden. c. Click OK. 3. Set files to Read-only as follows: a. Double-click Finances to view its contents. b. Right-click 2017report.xlsx and select Properties. c. Select Read-only. d. Click OK. e. -
Refs: Is It a Game Changer? Presented By: Rick Vanover, Director, Technical Product Marketing & Evangelism, Veeam
Technical Brief ReFS: Is It a Game Changer? Presented by: Rick Vanover, Director, Technical Product Marketing & Evangelism, Veeam Sponsored by ReFS: Is It a Game Changer? OVERVIEW Backing up data is more important than ever, as data centers store larger volumes of information and organizations face various threats such as ransomware and other digital risks. Microsoft’s Resilient File System or ReFS offers a more robust solution than the old NT File System. In fact, Microsoft has stated that ReFS is the preferred data volume for Windows Server 2016. ReFS is an ideal solution for backup storage. By utilizing the ReFS BlockClone API, Veeam has developed Fast Clone, a fast, efficient storage backup solution. This solution offers organizations peace of mind through a more advanced approach to synthetic full backups. CONTEXT Rick Vanover discussed Microsoft’s Resilient File System (ReFS) and described how Veeam leverages this technology for its Fast Clone backup functionality. KEY TAKEAWAYS Resilient File System is a Microsoft storage technology that can transform the data center. Resilient File System or ReFS is a valuable Microsoft storage technology for data centers. Some of the key differences between ReFS and the NT File System (NTFS) are: ReFS provides many of the same limits as NTFS, but supports a larger maximum volume size. ReFS and NTFS support the same maximum file name length, maximum path name length, and maximum file size. However, ReFS can handle a maximum volume size of 4.7 zettabytes, compared to NTFS which can only support 256 terabytes. The most common functions are available on both ReFS and NTFS. -
Lab #6: Stat Overview Stat
February 17, 2017 CSC 357 1 Lab #6: Stat Overview The purpose of this lab is for you to retrieve from the filesystem information pertaining to specified files. You will use portions of this lab in Assignment #4, so be sure to write code that can be reused. stat Write a simplified version of the stat utility available on some Unix distributions. This program should take any number of file names as command-line arguments and output information pertaining to each file as described below (you should use the stat system call). The output from your program should look as follows: File: ‘Makefile’ Type: Regular File Size: 214 Inode: 4702722 Links: 1 Access: -rw------- The stat system call provides more information about a file, but this lab only requires the above. The format of each field follows: • File: the name of the file being examined. • Type: the type of file output as “Regular File”, “Directory”, “Character Device”, “Block Device”, “FIFO”, or “Symbolic Link” • Size: the number of bytes in the file. • Inode: the file’s inode. • Links: the number of links to the file. • Access: the access permissions for the file. This field is the most involved since the output string can take many forms. The first bit of the access permissions denotes the type (similar to the second field above). The valid characters for the first bit are: b – Block special file. c – Character special file. d – Directory. l – Symbolic link. p – FIFO. - – Regular file. The remaining bits denote the read, write and execute permissions for the user, group, and others. -
Z/OS Distributed File Service Zseries File System Implementation Z/OS V1R13
Front cover z/OS Distributed File Service zSeries File System Implementation z/OS V1R13 Defining and installing a zSeries file system Performing backup and recovery, sysplex sharing Migrating from HFS to zFS Paul Rogers Robert Hering ibm.com/redbooks International Technical Support Organization z/OS Distributed File Service zSeries File System Implementation z/OS V1R13 October 2012 SG24-6580-05 Note: Before using this information and the product it supports, read the information in “Notices” on page xiii. Sixth Edition (October 2012) This edition applies to version 1 release 13 modification 0 of IBM z/OS (product number 5694-A01) and to all subsequent releases and modifications until otherwise indicated in new editions. © Copyright International Business Machines Corporation 2010, 2012. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . xiii Trademarks . xiv Preface . .xv The team who wrote this book . .xv Now you can become a published author, too! . xvi Comments welcome. xvi Stay connected to IBM Redbooks . xvi Chapter 1. zFS file systems . 1 1.1 zSeries File System introduction. 2 1.2 Application programming interfaces . 2 1.3 zFS physical file system . 3 1.4 zFS colony address space . 4 1.5 zFS supports z/OS UNIX ACLs. 4 1.6 zFS file system aggregates. 5 1.6.1 Compatibility mode aggregates. 5 1.6.2 Multifile system aggregates. 6 1.7 Metadata cache. 7 1.8 zFS file system clones . 7 1.8.1 Backup file system . 8 1.9 zFS log files. -
Introduction to PC Operating Systems
Introduction to PC Operating Systems Operating System Concepts 8th Edition Written by: Abraham Silberschatz, Peter Baer Galvin and Greg Gagne John Wiley & Sons, Inc. ISBN: 978-0-470-12872-5 Chapter 2 Operating-System Structure The design of a new operating system is a major task. It is important that the goals of the system be well defined before the design begins. These goals for the basis for choices among various algorithms and strategies. What can be focused on in designing an operating system • Services that the system provides • The interface that it makes available to users and programmers • Its components and their interconnections Operating-System Services The operating system provides: • An environment for the execution of programs • Certain services to programs and to the users of those programs. Note: (services can differ from one operating system to another) A view of operating system services user and other system programs GUI batch command line user interfaces system calls program I/O file Resource communication accounting execution operations systems allocation error protection detection services and security operating system hardware Operating-System Services Almost all operating systems have a user interface. Types of user interfaces: 1. Command Line Interface (CLI) – method where user enter text commands 2. Batch Interface – commands and directives that controls those commands are within a file and the files are executed 3. Graphical User Interface – works in a windows system using a pointing device to direct I/O, using menus and icons and a keyboard to enter text. Operating-System Services Services Program Execution – the system must be able to load a program into memory and run that program.