Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Topic: File system fragmentation

    Note: these results are not from the primary (high quality) database.

Sun Educational Services Entitlement Program Upgrade the VERITAS file system layout, monitor fragmentation in a file system, and defragment a VERITAS file system. VERITAS File System provides comprehensive instruction on using VERITAS File System in a Solaris operating environment, from basic procedures such as installation and creation of a file system, to advanced topics such as extent management and file system tuning. Describes the role of the intent log in maintaining file system consistency, and control the behavior of the intent log through mount options. suned.sun.com /Portal/US/46/VT-220.html

Before You Think But if all else is well, file system fragmentation alone is unlikely to cause crashes, lockups, resets or software errors of any kind. A fragmented file system causes slower performance, and as the critical period for file writes is increased, the risks of data corruption and instability are increased. File system failure pattern: Various focal software or activity failures, failure to boot up, explicit error messages, data loss, startup directly to shutdown with no desktop access between, apparent lack of free disk space, crashes etc. cquirke.mvps.org /9x/bthink.htm   (1460 words)

Journaling-Filesystem Fragmentation Project In my simulations I calculate the average internal fragmentation by dividing the number of bytes that are on disk per file or per partition disk by the number of theoretically usable bytes which is the number of blocks used times the block size. The actual measured loss of performance depends on various aspects like the disk model, the file system block layout algorithm, the file system usage pattern, all kind of different caches of the disc and of the OS. From the user's and administrator's point of view one might also be interested in choosing the right file system for the right task and corresponding workload. www.informatik.uni-frankfurt.de /~loizides/reiserfs   (1178 words)

File Layout and File System Performance - Smith, Seltzer (ResearchIndex) But the repeated creation and deletion of files of varying sizes that occurs over time on active file systems is likely to cause fragmentation of free space, limiting the ability of the file system to allocate data contiguously... ...space may become scarce on the file system, forcing new files to be fragmented and decreasing file system throughput. 15 The Counterpoint Fast File System (context) - Peacock - 1988 DBLP citeseer.ist.psu.edu /smith94file.html   (448 words)

The Effects of Age and Fragmentation on File System Performance File system performance is closely correlated to the fragmentation of the files that are being read and written on that file system. The goals have this work are to understand the effects of fragmentation on UNIX file system performance, and to analyze the causes of this fragmentation in the hopes of discovering better algorithms for disk allocation and file layout. On all of the file systems studied, except for the two news partitions, at least 60% of the file data blocks were laid out contiguously. www.eecs.harvard.edu /~keith/research/tr94.html   (780 words)

INCHIKO.com_TRAINING_Veritas Manager Create and manage file system snapshots, monitor file system fragmentation, defragment a file system, and control file system logging behaviour You will learn how to combine file system and disk management technology to ensure easy management of all storage and maximum availability of essential data. Unix system administrators and other technical staff will receive comprehensive instruction on using Foundation Suite file and disk management products, Volume Manager, and File System. www.inchiko.com /veritas_manager.htm   (780 words)

Data Recovery services training and software The Data Can be recovered with this software until it has not been Over-written by other files or if you've the worst case of fragmentation in you hard disk. This is the best opportunity for the students and Software professionals to learn low-level Disk accession with programming and to learn how to Read-Write the low level information of boot sector. The Source Code is Only for Educational Purpose and any Professional use of the Source code is prohibited. www.datadoctor.biz /bak-u.htm   (795 words)

Fragmentation: Chapter 2 Fragmentation of the contents of such a file causes virtually no performance problems, as the file is designed to be accessed in random order and any new record is guaranteed to fit precisely within any free space in the file. This type of fragmentation affects performance of only those applications accessing the affected file (unless such activity is so intense that it degrades the performance of the entire system). This type of fragmentation will be explained here only to differentiate it from our real subjects, file and free space fragmentation. www.execsoft.com /fragbook/chapter2.htm   (2736 words)

fsck(8) man page After successfully correcting a file system, fsck sets the file system's super block clean flag to stable, prints the number of files on that file system, the number of used and free blocks, and the percentage of fragmentation. A file system may be specified by giving the name of the cooked or raw device on which it resides, or by giving the name of its mount point. File systems are checked regardless of the state of their clean flag. www.rahul.net /cgi-bin/userbin/man?topic=fsck§ion=8   (1434 words)

BULMA: Journal File Systems in Linux File systems with large files tend to make the opposite choice and use large block sizes in order to reduce external fragmentation of the file system and their files' extents. A journaling file system is a fault-resilient file system in which data integrity is ensured because updates to files' metadata are written to a serial log on disk before the original disk blocks are updated. This would cause an inconsistency of the whole file system, for example a new file that wasn't created in the disk or files that were removed but their i-nodes and data blocks still remain in the disk. bulma.net /impresion.phtml?nIdNoticia=1154   (5149 words)

Fragmentation: Introduction This type of fragmentation may be a problem with the application which maintains the file; it is not inherent in the operating system or disk file structure. File fragmentation concerns computer disk files that are not whole but rather are broken into scattered parts, while free space fragmentation means that the empty space on a disk is broken into scattered parts rather than being collected all in one big empty space The word fragmentation means "the state of being fragmented." The word fragment means "a detached, isolated or incomplete part." It is derived from the Latin fragmentum, which in turn is derived from frangere, meaning "break." So fragmentation means that something is broken into parts that are detached, isolated or incomplete www.execsoft.com /fragbook   (1407 words)

What is file allocation table? - A Word Definition From the Webopedia Computer Dictionary Due to fragmentation, a file may be divided into many sections that are scattered around the disk. Whether you're looking for a refresher on files systems or want to learn the difference between FAT file systems vs. NTFS file systems, this tutorial explains the ins and outs, and pros and cons of each. A table that the operating system uses to locate files on a disk. www.webopedia.com /TERM/F/file_allocation_table_FAT.html   (245 words)

os6.doc In segmented systems, the placement of new segments retrieved from secondary storage is somewhat trickier as over time in a segmented memory, the type of fragmentation that is illustrated in Figure 2 will occur. Additionally, the operating system must decide when it will be necessary to fetch data from secondary storage (the disk system), and how this should be placed in the main memory with appropriate updating of the relevant address map parameters. The task of the operating system, then, is to refer to this list and use that information to decide which gap is to be used to accommodate the new block of data. www.dcs.napier.ac.uk /~petert/os6.doc   (2270 words)

Patch README for README.105181 The reboot is preferable because it allows the file systems to be sync'd and prevents the generation of an unnecessary kernel core file. 4274565 System could hard hang in dr_relocate_ismpage 4283719 large kernel allocations can end up waiting forever for their pages (from 105181-18) 4228409 rmalloc(9F) sloth and fragmentation kill Veritas performance 4229608 SS20 running 5.7 hangs, deadlock between page_lock and entersq 4261612 profil not disabled on exec*() as indicated in man page 4251398 DR memory drain stalls. If this cannot be done, it is suggested that you have the system in as quiet a state as possible, that is, no users are logged on and no user jobs are running. access1.sun.com /cgi-bin/rpatch2html?README.105181-05   (3448 words)

Virtual memory - Wikipedia, the free encyclopedia Though it is still possible to use a file for swapping, it is recommended to use a separate partition, because this excludes chances of fragmentation, which reduces the performance of swapping. The use of virtual memory, though slower than if more RAM were added, allows a computer system to handle larger files and operate with more memory "headroom" than the computer actually physically possesses. A swap area is created using the command mkswap filename/device, and may be turned on and off using the commands swapon and swapoff, respectively, accompanied by the name of the swap file or the swap partition. en.wikipedia.org /wiki/Virtual_memory   (2847 words)

FAT (file allocation table) - Backup Terms Explained A file storage table that the operating system uses to locate files on a disk. The FAT keeps track of pieces scattered on the disk due to fragmentation. FAT (file allocation table) - Backup Terms Explained www.liutilities.com /products/winbackup/backupterms/FAT   (61 words)

FAT - File Allocation Table For example, a single file on your hard drive may not be stored in one place, the file could be split up and stored in several different (physical) places (this is called fragmentation), the FAT keeps a record of where the different parts of the file are stored. FAT (File Allocation Table) refers to a data table that holds information about how and where files are stored on any one partition (for simplicity think of a partition as all the files on your hard drive). The FAT system does not duplicate critical data (as opposed to NTFS) so if a critical sector is lost then it can mean the loss of all data within the partition. www.helpwithpcs.com /jargon/fat.htm   (141 words)

File Allocation Table As well as disks having smaller capacities when the FAT system was designed, there were also relatively fewer files on the disks and as the number of files on disks increased, they became more susceptible to fragmentation. The volumes on any HDD or FDD are divided into four areas: the Boot Sector, File Allocation Table(s), the root directory (at the start of the disk) and the file or data area (where the file data is stored, space is allocated in units called clusters, which are one or more contiguous sectors). The On-disk data structure is known as the FAT which records where individual portions of each file are located on the disk, keeping track of the allocation of files on the disk. ourworld.compuserve.com /homepages/david_fletcher1/Fletcher2/fat.htm   (1399 words)

(Andrews K., Kappe F., Maurer H.) The Hyper-G Network Information System Current network information systems, whilst extremely successful, run into problems of fragmentation, consistency, scalability, and loss of orientation. Abstract: As the Internet continues to experience exponential rates of growth, attention is shifting away from mainstream network services such as electronic mail and file transfer to more interactive information services. Of particular note are Hyper-Gs tightly-coupled structuring, linking, and search facilities, its projection of a seamless information space across server boundaries with respect to each of these facilities, and its support for multiple languages. www.jucs.org /jucs_1_4/the_hyper_g_network   (1399 words)

Dictionary of Computers - file allocation table As a result of fragmentation, files can be split into many parts sited at different places on the disc. A table used by the operating system to record the physical arrangement of files on disc. White represents a desire for peace and liberty. www.tiscali.co.uk /reference/dictionaries/computers/data/m0044481.html   (81 words)

SDB:EXT2 Fragmentation - openSUSE When you write a block in an ext2 file system, the file system occupies immediately up to 7 further successive blocks for that file. The ext2 file system writes files with a kind of writeahead, too, i.e. Finally, you also have to consider the buffer cache of the operating system, i.e., on the second read attempt, everything comes out from the RAM anyway and the data arrangement on the disk does not matter. en.opensuse.org /SDB:EXT2_Fragmentation   (599 words)

block size The file system's block size is often different from the hard disk's physical block size. Files larger than the file system's block size may be broken into smaller fragments when they are stored, with sections of the file being stored in different locations across the disk. This is known as fragmentation and, in some cases when taken to an extreme, can severely limit system performance. www.coffeycountyks.org /Terms/2461HTML-286.html   (77 words)

Diet Supporters.com Forums - Defragmentation Defragmentation collects all those parts into one stream of data again, speeding up your system. defragmentation When you use the same file over and over again, writing, rewriting, saving, and deleting parts of it on the same disk, the file becomes fragmented. Although fragmentation does not lose the information contained in the file, it does eventually slow down access to the file itself, because the OS must search the whole disk to create the sum of the file's parts. www.dietsupporters.com /forums/printthread.php?t=484   (551 words)

OS/2.cz - Short Introduction to JFS and LVM JFS is organized like a traditional Unix-ish file system, it presents a logical view of files and directories linked together to form a tree-like structure. Of course, if a process was in the middle of writing a file when the system crashed or power died, the file could be inconsistent (the app might not be able to read it again), but you will not lose this file nor other files, as is often the case with other file systems. JFS attacks this by allowing fragmentation of logical blocks into smaller units, as small as 512 bytes (this is sector size on harddrives and it is not possible to read or write less than 512 bytes from/to disk). www.os2.cz /article1.html   (2372 words)

Conversational Mass Spectral Retrieval System and Its Use as an Aid in Structure Determination, Anal. Chem., 44, 1951-1961(1972) This is satisfactory, provided that the compound is in the file, but if it is not in the file, this search method may fail to locate an interesting lower homolog or related compound with a similar mass spectral fragmentation pattern. After the peaks were sorted by increasing mass (m/e value), the next program took each mass and the list of references (i.e., spectrum ID numbers) and generated a disk file of the m/e values with pointers to a second disk file containing the references to these m/e values. In contrast to the peak and molecular weight files, which use only one word per cell, in the hash file each cell is two words, one for the numeric key-value, and the second for the pointer value for the second file. www.hellers.com /steve/resume/p16.html   (2372 words)

Default cluster size for FAT and NTFS All file systems used by Windows organize your hard disk based upon cluster (or allocation unit) size, which represents the smallest amount of disk space which can be allocated to hold a file. It does not apply to Windows 2000 Setup, which formats the partition using the file system you choose. The maximum default cluster size under Windows NT 3.51 and later is 4K due to the fact that NTFS file compression is not possible on drives with a larger allocation size. support.microsoft.com /default.aspx?scid=kb;en-us;Q140365   (551 words)

Interview With the People Behind JFS, ReiserFS & XFS - OSNews.com XFS is slower than reiserfs for the typical file size distributions on "typical" file systems, and I encourage you to examine our benchmarks, where you will see that they are faster for very large file writes, and slower for typical file sizes. XFS is an excellent file system, and there is an important area where XFS is higher performance than we are. Some of the features of XFS which other filesystems often do not have would be: www.osnews.com /story.php?news_id=69   (3873 words)

AXCEL216's 1000+ FREE Windows Power Toys Diskeeper Lite v7.0 32-bit for Windows 98/NT4/2000/ME/XP/2003 Microsoft Defrag tool replacement analyzes fragmentation levels and defragments manually each hard disk/partition, file system(s), paging/swap file(s), highly customizable. GXExplorer v0.994 32-bit Windows 9x/NT4/2000/ME/XP/2003 Explorer replacement: multiple (thumbnail) file viewer, full right-click support, dual pane view, customizable toolbar, built-in ZIP manager, folder synchronizer, Run command line, DOS box etc, highly customizable. PC Magazine Change Of Address 2 (COA2) v1.0 32-bit for Windows 9x/NT4/2000/ME/XP changes all system references to match the new location of any program you move to any other drive/partition/directory/folder. www.mdgx.com /toy.htm   (3873 words)

AFS Frequently Asked Questions AFS is a distributed filesystem that enables co-operating hosts (clients and servers) to efficiently share filesystem resources across both local area and wide area networks. An AFS cell is a collection of servers grouped together administratively and presenting a single, cohesive filesystem. AFS is based on a distributed file system originally developed at the Information Technology Center at Carnegie-Mellon University that was called the "Andrew File System". www.angelfire.com /hi/plutonic/afs-faq.html   (11697 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.