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| | Unix File System - Wikipedia, the free encyclopedia |
 | | UNIX file system (UFS) is a file system used by many Unix and Unix-like operating systems. | | | This worked well for the small disks early unixes were designed for, but as technology advanced and disks got larger, moving the head back and forth between the clump of inodes and the data blocks they referred to caused thrashing. | | | It is derived from the Berkeley Fast File System (FFS), which itself was originally developed from FS in the first versions of UNIX developed at Bell Labs. |
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http://en.wikipedia.org/wiki/UFS2
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| | CASE STUDY: UNIX File System |
| | A UNIX file system is a self-contained entity that occupies a logical disk. | | | There are two versions of the UNIX file system: s5fs [system V file system) and ufs [UNIX file system]. | | | The file system interface is defined by system calls and file utilities that allow users to create, delete, and otherwise manipulate files. |
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http://www.cs.uah.edu/~weisskop/cs690_casestudyunixfiles.htm
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| | The Unix File System |
| | A file is the smallest unit of storage in the Unix file system. | | | The Unix file system is a methodology for logically organizing and storing large quantities of data such that the system is easy to manage. | | | A file spec may simply consist of a file name, or it might also include more information about a file, such as where is resides in the overall file system. |
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http://www.rwc.uc.edu/thomas/Intro_Unix_Text/File_System.html
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| | Ch 4 -- The UNIX File System |
| | Another important concept is that of a network file system (NFS), which is used to access files on a physically different computer from the local computer. | | | This is the parent of all the directories and files in the UNIX file system. | | | In the UNIX operating system, a file is a repository of raw or processed data stored as a stream of bytes (also known as characters). |
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http://dan.moneeek.com/content/ref/_unix/unix-unleashed(admin)/ch04.htm
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| | Unix Internals |
| | Advanced Programming in the Unix Environment By W. | | | In Unix, a directory is a special file. | | | Whenever the contents of the file is changed, the "inode modified time" also changes. |
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http://www.angelfire.com/myband/binusoman/Unix.html
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| | Unix File System |
| | The Unix operating system is a set of programs or software that controls the computer and acts as the link between the user and the computer and provides tools to help you do your work. | | | Unix files are usually stored on magnetic disks, but the structure of any Unix file is independent of the physical medium on which it is written. | | | Ordinary files include both the files created by users and the files that come as part of the Unix system itself; neither is given any distinctive privileges. |
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http://www.hicom.net/~shchuang/Unix/unix1.html
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| | The Unix File System - OIT Help Desk |
| | The UNIX file system is a hierarchical structured, file based system. | | | File Name: The file name is simply a string of characters that identifies a file for a user, and has no restrictions on the name, other than it must be unique within a given directory, and be no longer than the system's maximum file name length (usually 256 characters). | | | When you cd into a directory, UNIX only knows that you are in a directory, not which one, or where, it needs '.' to know where you are, and '..' to resolve it's relative position in the file system. |
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http://www.helpdesk.umd.edu/systems/cluster/all/3644
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| | Early UNIX file system formats |
| | A file system is constructed atop a contiguous array of storage blocks of uniform size; 64 words on the PDP-7, 512 bytes on the PDP-11. | | | The number of blocks in a file system is now limited only by the use of 16-bit block numbers, so a 32-megabyte file system is possible. | | | The number of blocks in a file system is now limited by the 24-bit addresses stored in the i-numbers: an eight-gigabyte file system is possible. |
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http://www.cita.utoronto.ca/~norman/old-unix/old-fs.html
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| | Unix for Advanced Users - The Unix Filesystem - The Physical Filesystem |
| | The standard Unix filesystem, generically referred to as the "ufs" filesystem, is arranged on a disk partition using a "linked-list" of pointers to data. | | | Files are stored in the filesystem in two pieces: (1) a chunk of data somewhere in the filesystem; (2) a data structure which contains information about the location, size, creation/modification/access times, ownership, access attributes of and links to the file. | | | File systems must be properly unmounted to ensure that all data are written to disk. |
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http://www.uwsg.iu.edu/UAU/filesystem/physical.html
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| | UNIX/Linux File System Recoverability |
| | The varied UNIX file systems and the recent Linux file systems are the subject of this month’s newsletter. | | | Performance means how the file system is using the hardware of the computer to perform file read and writing operations. | | | Some of the smartest minds in computer science have devoted their careers to developing the operating system and file systems for the UNIX and Linux platforms. |
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http://www.ontrack.com/special/0503unix.asp
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| | The UNIX File System |
| | Files are the heart of the UNIX system. | | | Notice that all of the other entries in a directory specify files that are at a lower level in the file system hierarchy. | | | No structure is imposed on a file by the UNIX system, and no meaning is attached to its contents. |
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http://turing.une.edu.au/dept/material/other/ugguide-1.2/node14.html
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| | UNIX file system/directory structure |
| | When you first log in to the UNIX system, you are usually placed in your home directory. | | | Converting between decimal and binary is not easy for larger numbers, using binary is not easy for people, but using binary is all the computer knows. | | | ASCII as it is used for ASCII text files. |
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http://www.cs.umd.edu/class/fall2002/cmsc107/file.system.htm
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| | The UNIX File System |
| | Because UNIX treats such devices as files, a degree of compatibility can be achieved between device i/o, and ordinary file i/o, allowing for the more efficient use of software. | | | When we speak of a UNIX file system, we are actually referring to an area of physical memory represented by a single i-list. | | | The information on each of the block special files is kept in a system database called the file system table, and is usually located in /etc/fstab. |
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http://www.isu.edu/departments/comcom/unix/workshop/fstour.html
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| | paper |
| | A reimplementation of the UNIX file system is described. | | | File access rates of up to ten times faster than the traditional UNIX file system are experienced. | | | These include a mechanism to place advisory locks on files, extensions of the name space across file systems, the ability to use long file names, and provisions for administrative control of resource usage. |
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http://www.hu.freebsd.org/hu/doc/smm/05.fastfs/paper.html
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| | The Unix File system |
| | The generation number is used by the network file system for file handle calculation. | | | There is an i-node on disc for every file on the disc and there is also a copy in kernel memory for every open file. | | | There is no requirement that the physical addresses of a file should be contiguous (i.e adjacent) and with multiple files being handled on a disc it is unlikely that contiguity would offer any advanatages for performance. |
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http://www.scit.wlv.ac.uk/~jphb/spos/notes/ufs.inode.html
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| | UnixWorld Book Report Tru64 UNIX File System Administration Handbook Full Article June 25, 2001 |
| | Furthermore, this book is written primarily for systems administrators, systems and software engineers, software support specialists and others who must optimize the performance of, as well as perform advanced troubleshooting on, Tru64 Unix file systems. | | | In other words, if Tru64 Unix is an automobile engine, then the file system is the microprocessor that keeps all of the engine components working together efficiently. | | | In addition, this book will help systems administrators and engineers who are designing, managing and troubleshooting Tru64 Unix file systems at large corporations. |
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http://www.nwc.com/unixworld/1213/1213uw.html
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| | CS 102 -- Spring 2004 -- Unix File System |
| | Unix, however, has only one directory tree, even if the file system includes directories and subdirectories from different machines across a network. | | | The home directory is your space on the network to create files and directories. | | | Directories on Unix networks are commonly displayed by having a '/' appended to their name. |
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http://people.cs.uchicago.edu/~wfreis/CS102_04/unix/unix_fs.html
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| | File Systems in Unix |
| | For example, in many systems the user files are subdirectories of a directory named `home' within `usr'; if we had users Jack and Jill, for example, Jack's home directory would be /usr/home/jack, and all his files would be within that subtree, and the analogous statement would hold for Jill. | | | In Unix, all files are protected under some access control mechanism, so that the owner of a file can deny access of his files to other users. | | | In Unix, the files are organized into a tree structure with a root named by the character '/'. |
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http://heather.cs.ucdavis.edu/~matloff/UnixAndC/Unix/FileSyst.html
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| | UNIX File System |
| | All Unix systems have a root filesystem, mounted on / | | | Unix actually references all files internally using a numeric value (unique in a given filesystem). | | | Symbolic links are files that point to other files or directories, similar to aliases in MacOS or shortcuts in Windows. |
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http://www.dartmouth.edu/~rc/classes/unix2/slide02.detail.html
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| | The Unix File system |
| | Included among the various supported file systems are the Unix File System (UFS) and the older System V File System (S5FS). | | | Modern Unix systems use a Virtual File System (VFS), this allows the system to use many different actual file systems in a seamless fashion. | | | This allows Network File Systems (NFS), High-Sierra File Systems (HSFS - found on CDROMs), MSDOS File Systems (PCFS) amongst others to be included in the Unix view of an integrated hierarchy of files and directories. |
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http://www.scit.wlv.ac.uk/~jphb/spos/notes/ufs.basics.html
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| | Unix File System Technology |
| | Buffer cache refers to the computer system memory allocated by the operating system to store data being read from or being written to the disk drives. | | | These changes have generally improved system reliability and increased its capabilities with respect to I/O in order to keep pace with changes in storage technology. | | | For example, in HP-UX 9.0x the largest disks that could be handled by the native OS were 4GB. |
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http://www.mdlcorp.com/iworks97/sld005.htm
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| | Andrew File System (afs): The UNIX File System |
| | The Andrew File System (afs) is the name of the file system that is used by the UNIX operating system on our machines. | | | There are many commands that affect the files and directories that are available to UNIX users. | | | Andrew File System (afs): The UNIX File System |
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http://www.cs.wisc.edu/~deppeler/tutorials/UNIX/afs
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| | UNIX file system |
| | A file system is a logical method for organising and storing large amounts of information in a way which makes it easy manage. | | | The UNIX file system has several important features. | | | The file is the smallest unit in which information is stored. |
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http://unixhelp.ed.ac.uk/concepts/fsystem.html
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| | Cryptographic File System cfs-1.4b2 |
| | Files in these directories (as well as their pathname components) are transparently encrypted and decrypted with the specified key without further user intervention; cleartext is never stored on a disk or sent to a remote file server. | | | System management functions, such as file backup, work in a normal manner and without knowledge of the key. | | | It supports secure storage at the system level through a standard Unix file system interface to encrypted files. |
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http://www.computing.ee.ethz.ch/sepp/cfs-1.4b2-to.html
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| | UNIX File System |
| | The UNIX file system is best represented as a heirarchical tree structure, with parent directories at the top, and their sub-directories below them. | | | Every time a user creates a file or directory, they are creating a pointer in a directory. | | | Suppose they are working together on a project, so janedoe creates the file 'project' in her www directory. |
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http://info.netmar.com/userguide/unix
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| | The Whizzine: Unix File System |
| | To summarize, Unix file organization is logical so you need not be concerned with physical devices, the directory names are separated by a forward slash, and all file and directory names are case sensitive. | | | Furthermore, various Unix systems tend to use the same logical scheme for the basic components of the system. | | | For what it's worth, mounting allows a Unix system to include parts of a different computer in your computer's file system. |
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http://www.whizkidtech.redprince.net/whizzine/archive/1/2
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| | A Fast File System for UNIX - McKusick, Joy, Leffler, Fabry (ResearchIndex) |
| | Abstract: This paper describes the changes from the original 512-byte UNIX file system to file the new system released with the 4.2 Berkeley Software Distribution. | | | Replication in the Harp File System - Liskov, Ghemawat, Gruber, Johnson,.. | | | 3 Bibliography on file and I/O system optimization and related.. |
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http://citeseer.ist.psu.edu/mckusick84fast.html
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| | Early Unix history and evolution |
| | A file system without a way to exercise it is a sterile proposition, so he proceeded to flesh it out with the other requirements for a working operating system, in particular the notion of processes. | | | Structurally, the file system of PDP-7 Unix was nearly identical to today's. | | | The most serious inconvenience of the implementation of the file system, aside from the lack of path names, was the difficulty of changing its configuration; as mentioned, directories and special files were both made only when the disk was recreated. |
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http://cm.bell-labs.com/cm/cs/who/dmr/hist.html
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| | The Andrew File System |
| | The Andrew File System (AFS) is a distributed network file system that enables files from any AFS machine across the country to be accessed as easily as files stored locally. | | | You use standard UNIX commands to create subdirectories and to move, copy and delete files. | | | Cells connect to form one enormous UNIX file system under the root /afs directory. |
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http://www.psc.edu/general/filesys/afs/afs.html
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| | TLEN5833 UNIX File System |
| | The root login is a user on the UNIX machine who has absolute power to do anything on the machine. | | | - The UNIX filesystem is hierarchial, which means that all directories and files are organized in a tree-like structure with the directories corresponding to branches and files corresponding to leaves. | | | For example, a file with an absolute pathname of /home/cathy/my_dogs can be referred as simply my_dogs if my current directory is /home/cathy. |
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http://morse.colorado.edu/~tlen5833/filedirs.htm
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| | UNIX File system |
| | Mosaic uses the UNIX operating system on all file servers used to store all of your files. | | | All of your UNIX files can be stored under this directory. | | | The first is the File Manager and the second is to use a Terminal window. |
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http://www.coe.uncc.edu/mosaic/mosaic_tutorial/unix/unix_filesystem.html
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| | UNIX File system |
| | The most efficient way to move file in UNIX is to use file move commands in a terminal window. | | | How move files in the Mosaic UNIX File System | | | There are several commands that are essential to any UNIX user. |
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http://www.coe.uncc.edu/mosaic/mosaic_tutorial/unix/unix_filemove.html
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| | UNIX File System |
| | Using the cd command to navigate the UNIX file system can be confusing for new users. | | | Thus, a file can be in a directory, or you can be in your current directory. | | | You are able to create and store files and other directories here. |
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http://www.cs.uni.edu/Help/directory.html
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| | learninglab.oreilly.com -- Effective Online Training in Information Technology |
| | Enroll in the first Linux/Unix System Adminstration course from the University of Illinois Office of Continuing Education online certification series at the O'Reilly Learning Lab and get the "Learn XML" course, a $498 value, for free. | | | The Linux/Unix course series is comprised of four courses that span Unix administration skills from basic to complex. | | | Are you interested in learning Linux and Unix system administration skills? |
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http://oreilly.useractive.com/courses/sysadmin.php3
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| | Unix File System |
| | A diagram of a typical directory tree for a Unix System | | | Restricted system data and dangerous utility programs restricted to system manager: password file, login | | | Directories to text files containing the full Unix Programmer's manual |
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http://www.hicom.net/~shchuang/Unix/unix2a.html
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| | eWEEK.com - Enterprise Technology News and Reviews |
| | Federal authorities have announced the first U.S. case against an alleged computer hacker, who is thought to have used an army of zombie computers to net tens of thousands of dollars while on the payroll of several spyware companies. | | | The New Linux Kernel: Better Wi-Fi, File Systems | | | Sony's quick reaction to the discovery that it installed aggressive malware on its customers' computers doesn't go far enough. |
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http://www.eWEEK.com
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| | CHAPTER 4 The UNIX File System |
| | 4.5 - File structure of standalone and server machines | | | 4.4 - Names and contents of important UNIX directories | | | Unix System Administration - 8 AUG 1996 [Next] [Previous] [Up] [Top] [Contents] |
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http://wks.uts.ohio-state.edu/sysadm_course/html/sysadm-57.html
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| | UNIX File System |
| | List files and directories and their attributes (ls) |
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http://www.challenge.nm.org/Help/bfile98/tsld002.htm
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