File Systems
... of the superblock. The superblock is stored in a different position on each cylinder group, so damage to one surface won’t ruin all copies of the superblock. • For performance, the cylinder group contains related information (e.g., inodes and the data blocks they reference) to reduce seek times. ...
... of the superblock. The superblock is stored in a different position on each cylinder group, so damage to one surface won’t ruin all copies of the superblock. • For performance, the cylinder group contains related information (e.g., inodes and the data blocks they reference) to reduce seek times. ...
Lecture 6 File Systems
... • These problems can be resolved by use of a condensed version of the access list. • To condense the length of the access-control list, many systems recognize three classifications of users in connection with each file: 1. Owner. The user who created the file is the owner. 2. Group. A set of users w ...
... • These problems can be resolved by use of a condensed version of the access list. • To condense the length of the access-control list, many systems recognize three classifications of users in connection with each file: 1. Owner. The user who created the file is the owner. 2. Group. A set of users w ...
File-Management
... • Can simulate last two with first method by inserting appropriate control characters • Who decides: – Operating system – Program ...
... • Can simulate last two with first method by inserting appropriate control characters • Who decides: – Operating system – Program ...
Operating System components File
... A distributed system collects physically separate, possibly heterogeneous, systems into a single coherent system, providing the user with access to the various resources that the system maintains. Access to a shared resource allows computation speedup, increased functionality, increased data availab ...
... A distributed system collects physically separate, possibly heterogeneous, systems into a single coherent system, providing the user with access to the various resources that the system maintains. Access to a shared resource allows computation speedup, increased functionality, increased data availab ...
Week_12 - Computing Sciences
... Linux Virtual File System (VFS) The purpose of a VFS is to allow client applications to access different types of file systems in a uniform way. Manages kernel file “abstractions” in one format for all file systems. File Manager Is a program that provides a user interface to work with the file syste ...
... Linux Virtual File System (VFS) The purpose of a VFS is to allow client applications to access different types of file systems in a uniform way. Manages kernel file “abstractions” in one format for all file systems. File Manager Is a program that provides a user interface to work with the file syste ...
A File System for Storage Class Memory
... class memory (SCM). With traditional persistent storage devices, the overhead brought by I/O latency is much higher than that of file system layer itself. So the storage system performance usually depends on the devices’ characteristics and the performance of I/O scheduler. However, if the access la ...
... class memory (SCM). With traditional persistent storage devices, the overhead brought by I/O latency is much higher than that of file system layer itself. So the storage system performance usually depends on the devices’ characteristics and the performance of I/O scheduler. However, if the access la ...
Operating System Security (II)
... The central elements are the File Control Blocks In UNIX, a File Control Block is called an i-node (“indexnode”) each file has a corresponding i-node structure, which contains information describing the file on-disk i-node (file system dependent) • persistent accounting information: user & group ...
... The central elements are the File Control Blocks In UNIX, a File Control Block is called an i-node (“indexnode”) each file has a corresponding i-node structure, which contains information describing the file on-disk i-node (file system dependent) • persistent accounting information: user & group ...
CH3
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. Resource allocation – allocating resources to multiple users( When multiple users are logged on the system ) or multiple jobs running at the same time. • ...
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. Resource allocation – allocating resources to multiple users( When multiple users are logged on the system ) or multiple jobs running at the same time. • ...
LESSON 6: COMPUTER OPERATING SYSTEMS Working on a
... based on their subject, such as management or fiction. You can then arrange these books in separate sections of a cabinet. You need to provide appropriate name to each section so that it is easier to locate a book. Similarly, in the Windows operating system, you use Windows Explorer to arrange files ...
... based on their subject, such as management or fiction. You can then arrange these books in separate sections of a cabinet. You need to provide appropriate name to each section so that it is easier to locate a book. Similarly, in the Windows operating system, you use Windows Explorer to arrange files ...
eDiscovery, the jargon explained.
... the jargon explained. In the day-to-day operations of eDiscovery we use terms that may well be new to many, so to assist with our communications between new, existing and prospective client’s we have created this glossary of electronic discovery terms, set out in alphabetical order, with simple desc ...
... the jargon explained. In the day-to-day operations of eDiscovery we use terms that may well be new to many, so to assist with our communications between new, existing and prospective client’s we have created this glossary of electronic discovery terms, set out in alphabetical order, with simple desc ...
ppt - Purdue University :: Computer Science
... number of the target-file, increases its reference count, and store the pair (i-node-no, name-link) in directory In some OSs, the reference count is also incremented when the file is open. This prevents the file from being removed while it is in use. ...
... number of the target-file, increases its reference count, and store the pair (i-node-no, name-link) in directory In some OSs, the reference count is also incremented when the file is open. This prevents the file from being removed while it is in use. ...
MULTIMEDIA Technology
... “compress” it. The seize of the file can be reduced by compressing the data. “Decompress” refers to returning compressed data to its original state. Compression/decompression software is used to accomplish this task ...
... “compress” it. The seize of the file can be reduced by compressing the data. “Decompress” refers to returning compressed data to its original state. Compression/decompression software is used to accomplish this task ...
All versions of the Microsoft Windows operating system create
... The files within these folders are generally referred to as “system files”. When a user installs programs (such as Microsoft Office, Adobe, etc), the operating system generally reserves the “Program Files” folder as the location for these items. It is the general convention that when a third party p ...
... The files within these folders are generally referred to as “system files”. When a user installs programs (such as Microsoft Office, Adobe, etc), the operating system generally reserves the “Program Files” folder as the location for these items. It is the general convention that when a third party p ...
The New Data Pump - NOCOUG - Northern California Oracle
... Basic Data Pump unload and load Query / Sample data filtering Re-attaching and monitoring a big job The PL/SQL API SQL File import External Table access driver ...
... Basic Data Pump unload and load Query / Sample data filtering Re-attaching and monitoring a big job The PL/SQL API SQL File import External Table access driver ...
The broken file shredder
... fwrite(buffer, BUFFER_SIZE, 1, fp); if (fflush(fp) != 0) application buffer => kernel /* error... */ if (fsync(fileno(fp)) != 0) kernel buffer => disk /* error... */ if (fclose(fp) != 0) and only then close the file /* error... */ ...
... fwrite(buffer, BUFFER_SIZE, 1, fp); if (fflush(fp) != 0) application buffer => kernel /* error... */ if (fsync(fileno(fp)) != 0) kernel buffer => disk /* error... */ if (fclose(fp) != 0) and only then close the file /* error... */ ...
Slides
... A variable is a name that stores a string It's often convenient to store a filename in a variable Store the following in a file named variables.sh and execute it #!/bin/sh # An example with variables filename="/etc/passwd" echo "Check the permissions on $filename" ls -l $filename echo "Find out how ...
... A variable is a name that stores a string It's often convenient to store a filename in a variable Store the following in a file named variables.sh and execute it #!/bin/sh # An example with variables filename="/etc/passwd" echo "Check the permissions on $filename" ls -l $filename echo "Find out how ...
Distributed File Systems
... separate systems. Users around the world are able to share data as if they were in the same building, allowing a much more flexible computing environment than would otherwise be available. ...
... separate systems. Users around the world are able to share data as if they were in the same building, allowing a much more flexible computing environment than would otherwise be available. ...
File I/O
... Study Java's I/O with text and binary files Examine role of exceptions in I/O Observe use of files in GUI programs in context of an information retrieval problem Learn about the role of files in database management systems ...
... Study Java's I/O with text and binary files Examine role of exceptions in I/O Observe use of files in GUI programs in context of an information retrieval problem Learn about the role of files in database management systems ...
File-System Implementation
... Modified data must be committed to the server’s disk before results are returned to the client (lose advantages of caching) The NFS protocol does not provide concurrency-control mechanisms ...
... Modified data must be committed to the server’s disk before results are returned to the client (lose advantages of caching) The NFS protocol does not provide concurrency-control mechanisms ...
files
... disks in units called files • The information in files must be persistent – that is not affected by creation/destruction of processes • These files must be managed by the OS • The part of the OS that handles this is called the file system ...
... disks in units called files • The information in files must be persistent – that is not affected by creation/destruction of processes • These files must be managed by the OS • The part of the OS that handles this is called the file system ...
File System in Win In a computer, a file system (sometimes written
... directories (or "folders"). Access to data stored on disks is a central feature of all operating systems. Computers store data on disks using files, which are structured in specific ways in order to allow for faster access, higher reliability, and to make better use out of the drive's available spac ...
... directories (or "folders"). Access to data stored on disks is a central feature of all operating systems. Computers store data on disks using files, which are structured in specific ways in order to allow for faster access, higher reliability, and to make better use out of the drive's available spac ...
Computer file
A computer file is a resource for storing information, which is available to a computer program and is usually based on some kind of durable storage. A file is ""durable"" in the sense that it remains available for other programs to use after the program that created it has finished executing. Computer files can be considered as the modern counterpart of paper documents which traditionally are kept in office and library files, and this is the source of the term.