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Topic: Berkeley Fast File System

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	Ext2 - Wikipedia, the free encyclopedia
		Minix file system was pretty free of bugs, but used 16-bit offsets internally and thus had a maximum size limit of 64 megabytes.
		The extended file system, ext, was released in April 1992 as the first file system using the VFS API and was included in Linux version 0.96c.
		The ext file system solved the two major problems in the Minix file system (maximum partition size and filename length limitation to 14 characters), and allowed 2 gigabytes of data and filenames of up to 255 characters.
	en.wikipedia.org /wiki/EXT2 (535 words)

	os quals question catalog (Site not responding. Last check: 2007-10-18)
		Each file was represented by a an entry in an inode array that contained information about the file and was the root of a tree of disk blocks, whose leaves were the data blocks of the file.
		File systems that support transactions need to be able to atomically commit or abort a collection of file operations.
		The NFS file server provides distributed access to files by allowing you to mount a subtree from the file system on a remote host into your local file tree (in any place in the local tree that you wish).
	www.cs.wisc.edu /~jsommers/osq/question/filesyst.html (5027 words)

	Implementing Dynamic File System Reorganization
		Even the well-tested ext3 file system, which is completely backwards and forwards compatible with the older ext2 file system and only a slightly modified kernel, faces slow espousal by the users of the Linux operating system.
		File systems that are reorganized online can avoid these locality constraints when the number of reads is much higher than the number of writes.
		If the file must be moved, file system primitives can be used to slowly move the blocks of the file over time, meanwhile updating the necessary inode and indirect block structures.
	www.cs.utexas.edu /~sjp/publications/cs380lreport.html (3654 words)

	The Effects of Age and Fragmentation on File System Performance
		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.
		File system performance is closely correlated to the fragmentation of the files that are being read and written on that file system.
	www.eecs.harvard.edu /~keith/research/tr94.html (780 words)

	Disk geo
		When a system is booted, the system’s firmware points to the boot device and extracts the secondary boot program into physical memory.
		Data from a file is written into a data block fragment, the minimum disk storage for any part of a file.
		The Solaris operating system moves all of the data of the file from that block into another block, thus assuring that all fragments are in the same data block.
	users.vnet.net /kidstar/diskgeo.htm (1268 words)

	A Dual-Disk File System: ext4
		One immediate consequence is that all file systems treat the disk as a sequence of blocks: it is almost as cheap to read a block (of consecutive bytes) as it is to read a single byte.
		This scheme is used in the IRIX file system [16].
		All relevant file attributes are kept in inodes, including a representation of the list of the blocks used by the file, (figure 3).
	www.cs.cmu.edu /~mihaib/fs/fs.html (5190 words)

	[No title]
		Other file system metadata (e.g., inode blocks, cylinder group blocks and the superblock) is cached in a separate pool of page frames, commonly referred to as the "buffer cache".
		Protecting the freemaps (or bitmaps) In order to eliminate the need to execute fsck before mounting a file system after a power failure, one must (conservatively) guarantee that the on-disk copy of the bitmaps never indicate that a live inode or block is free.
		When a file extension causes a fragment to be upgraded, either to a larger fragment or to a full block, the on-disk location may change (if the previous fragment could not simply be extended).
	www.ece.cmu.edu /~ganger/papers/CSE-TR-254-95/CSE-TR-254-95.appendix (6291 words)

	Berkeley Fast File System - Wikipedia, the free encyclopedia
		In computing, the Berkeley Fast File System (or FFS) is a file system used mostly by BSD-derivative Unix variants.
		It is a distant descendant of the original filesystem used by Unix System V (called just 'FS').
		FFS sits on top of UFS (1 or 2) and provides directory structure information, and a variety of disk access optimizations.
	en.wikipedia.org /wiki/Berkeley_Fast_File_System (116 words)

	2.1.1 Device Level
		These file systems are usually aware of and often optimized for specific device characteristics, as shown in Figure fig-level-device.
		Such file systems are difficult to port because they are coupled to the surrounding operating system: system call handlers call the file system code and the file system code calls device drivers.
		Because these file systems are optimized for the common combination of hard disks and Unix workloads, we find only a handful in use.
	www.am-utils.org /docs/zadok-thesis-proposal/node11.html (194 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)

	Solaris 10
		The UNIX File System (UFS) is the primary file system for the Solaris Operating System.
		The Network File System (NFS) was developed by Sun and introduced in the mid-80s as one of the first and most successful examples of open network file sharing.
		For example, to add mirrored file systems for three users and then add more disks, Solaris ZFS will reduce the number of tasks from 28 to five-—and the time required is cut from 40 minutes to 10 seconds.
	www.sun.com /software/solaris/data_management.jsp (998 words)

	[No title]
		If group is numeric and does not appear as a group name in the /etc/group file, it is interpreted as a group ID. -nogroup TRUE if the file belongs to a group ID for which the getgrgid() function returns null.
		If the file is a special file, the size field will instead contain the major and minor device numbers.
		To remove all files named a.out or .o that have not been accessed for a week and that are not mounted using nfs, enter: find / e(-name a.out -o -name (aa.o(aa e) -atime +7 \ -exec \rm {} e; -o -fstype nfs -prune 6.
	www.sandia.gov /ASCI/Red/usage/paragon/man/man1/find.1.html (1541 words)

	Softpanorama Filesystems Webliography
		The Unixware system was configured with /tmp as a tmpfs whereas the Solaris system had /tmp on the root file system.
		In order to access an unmounted file system, the utility must read the disk structures directly and perform all the tasks normally performed by the operating system; this requires a detailed understanding of how the file system is implemented.
		It has overviews of several other major file systems and their pros and cons before wading into the Be decisions for a file system and how they are implimented.
	www.softpanorama.org /Internals/filesystems.shtml (12279 words)

	Installable file system - Computing Reference - eLook.org
		system> (IFS or "File System Driver", "FSD") An API that allows you to extend OS/2 to access files stored on disk in formats other than FAT and HPFS, and access files that are stored on a network file server.
		The other variety of IFS (a "remote file system" or "redirector") allows file sharing over a LAN, e.g.
		In this case, the IFS passes a program's file access requests to a remote file server, possibly also translating between different file attributes used by OS/2 and the remote system.
	www.elook.org /computing/installable-file-system.htm (212 words)

	SunOS Virtual Memory Implementation - Moran (ResearchIndex)
		Abstract: The implementation of a new virtual memory (VM) system for Sun's implementation of the UNIX+ operating system (SunOS#) is described.
		The new VM system was designed for extensibility and portability using an object-oriented design carefully constructed to not compromise efficiency.
		and file system caching is well integrated with the virtual memory system.
	citeseer.ist.psu.edu /moran88sunos.html (533 words)

	WAFL - Write Anywhere File Layout (Site not responding. Last check: 2007-10-18)
		WAFL's two most important meta-data files are the inode file (which contains all inodes) and the free block bitmap file.
		WAFL has complete flexibility in its write allocation policies because no blocks are permanently assigned to fixed disk locations as they are in the Berkeley Fast File System (FFS).
		The only exception to the write anywhere policy is that one inode (in WAFL's case the inode describing the inode file) must be written in a fixed location in order to enable the system to find everything else.
	www.usenix.org /events/osdi99/full_papers/hutchinson/hutchinson_html/node3.html (142 words)

	[No title]
		The available file system types include the following: pfs Parallel File System (PFS) nfs Network File System (NFS) ufs UNIX File System (UFS) (Berkeley fast file system) If the -t switch is specified and a filesystem or directory is specified, the -t specification is ignored.
		If neither a file system or a directory is specified, statistics for all mounted file sys- tems are displayed.
		The showfs command displays the follow- ing information about the specified file systems: Mounted on File system's mount point: the directory on which the file system is mounted.
	www.sandia.gov /ASCI/Red/usage/paragon/man/man1/showfs.1.html (389 words)

	UFS - Wikipedia, the free encyclopedia
		UFS stands for UNIX file system, which is derived from Berkeley Fast File System which was originally developed from FS in the first versions of UNIX at ATandT.
		Linux rewrote from scratch the original UFS as EXT using similar concepts.
		Linux includes a UFS implementation for binary compatibility at the read level with other unixes, but since there is no standard implementation for the vendor extensions to UFS, linux does not have full support for writing to UFS.
	www.encyclopedia-online.info /UFS (700 words)

	Re: Why partition a Lunux system? The real deal !!!
		The version of the Berkeley Fast File system used by the ULTRIX Operating System has a limit of 2048 inodes per cylinder group.
		This limit is the constant MAXIPG in the include file /usr/include/ufs/fs.h.
		On a News spool tree, the average file probably is around or less than 2 KB.
	www.webservertalk.com /message82237.html (1770 words)

	EDM/2 - OS/2 Installable File Systems - Part 1/3
		For example, under many versions of UNIX, files are stored in the Berkeley fast file system format, which isn't compatible with FAT or HPFS.
		For example, the NFS (Network File System) protocol is completely UNIX oriented, so the NFS client (which is an IFS) has to handle UNIX conventions like case sensitive filenames and UNIX file attributes.
		No Doscalls; only file system helpers and DevHlps - None of the ring 3 API's (such as the Doscalls) are available to ring 0 code (except at initialization, which is special).
	www.edm2.com /0103/os2ifs1.html (2736 words)

	ISS X-Force Database: freebsd-ffs-integer-overflow(9771): FreeBSD FFS integer overflow file system corruption
		An integer overflow vulnerability in the Berkeley Fast File System (FFS) in FreeBSD 4.6.1-RELEASE-p4 and earlier and FreeBSD 4.6-STABLE prior to 2002-07-31 could allow a local attacker to overwrite and corrupt files on the file system.
		A local attacker could create a file that is larger than the file size allowed by the virtual memory system, which would allow the attacker to read or write to arbitrary blocks of memory on the FFS file system.
		CVE-2002-0829: Integer overflow in the Berkeley Fast File System (FFS) in FreeBSD 4.6.1 RELEASE-p4 and earlier allows local users to access arbitrary file contents within FFS to gain privileges by creating a file that is larger than allowed by the virtual memory system.
	xforce.iss.net /xforce/xfdb/9771 (359 words)

	Manpage of ICAT (Site not responding. Last check: 2007-10-18)
		The default file system type is system dependent.
		With most UNIX systems the default type is ufs (Berkeley fast file system).
		Copy holes in files as null blocks, so that absolute address information is preserved.
	staff.washington.edu /dittrich/talks/blackhat/tct/man/man1/icat.1.html (189 words)

	The Berkeley Fast File System (FFS)
		If possible, file direct-blocks and index blocks are allocated from same CG as inode,
		Attempt to allocate (plain) files' inodes in same CG as directory.
		Last block of small file is actually array of consecutive fragments.
	www.cse.unsw.edu.au /~cs9242/02/lectures/09-fs/node4.html (257 words)

	ECE 371RI Kernel Progress Report (Site not responding. Last check: 2007-10-18)
		I gave up on the ext2 file system (linux's fs).
		Flux had a bug in that 'readdir()' returns a different data structure that what's documented (or in the header file).
		With the new filesystem added, we may want to open some disk files from the program, and to use how the current checkpoint scheme works.
	www.crhc.uiuc.edu /~dstott/ukernels/progress0310.html (360 words)

	Simplify system backups with Partition Image - Software - Insight - ZDNet Asia
		When naming the file, it would be wise to consider a date-stamp name.
		The compression level determines both the size of the image file and the time spent creating that image.
		In the example shown in Figure B, the Gzipped format is used, providing a larger file size than the Bzip2 format, which will allow the backup to perform more quickly.
	www.zdnetasia.com /insight/software/0,39044822,39094489,00.htm (739 words)

	Enterprise Systems \| NetApp and Grid Storage: More Than Just Marketing?
		Chris Bennet, Senior Director of Storage Systems at Network Appliance, gets kudos for honesty when he concedes that his company’s “grid storage” campaign is just packaging for the marketplace, rather than a specific application of anything related to grid computing.
		Given the enormous incompatibilities between NetApp’s Berkeley Fast File System implementation and the Andrews File System embedded in Spinnaker technology, one immediate question is whether NetApp can deliver a converged-codeline product that is downwardly compatible with the company’s existing product line.
		The second is whether the engineers are ready to tackle the systemic problems of file sharing and synchronicity that we all confront.
	www.esj.com /storage/print.aspx?editorialsId=1106 (383 words)

	Unix File System - Indopedia, the Indological knowledgebase
		Unix File System - Indopedia, the Indological knowledgebase
		UNIX file system (UFS) is a file system used by many unix operating systems.
		This page was last modified 08:15, 4 Dec 2004 by Indopedia user User:.
	www.indopedia.org /UFS2.html (799 words)

	Data Storage-fat32 (Site not responding. Last check: 2007-10-18)
		Other related phrases include system recovery boot disk, file recovery fat32 freeware, hp recovery disk, ast hard disk recovery, and hard drive recovery......latest technology to the table which ensures the protection of our evidential findings.
		Other related terms are file recovery fat32 freeware, ast hard disk recovery, system recovery boot disk, hard drive recovery...
		A number of system areas are possible targets.
	www.datastoragesearch.com /qry/fat32/p-2 (600 words)

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