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<title>Andrew File System</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Andrew File System</span></span>

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</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with the <a href="Apple_File_System" title="Apple File System">Apple File System</a>, also abbreviated AFS.</div>

<p>The <b>Andrew File System</b> (<b>AFS</b>) is a <a href="Distributed_file_system" class="mw-redirect" title="Distributed file system">distributed file system</a> which uses a set of trusted servers to present a homogeneous, location-transparent file name space to all the client workstations. It was developed by <a href="Carnegie_Mellon_University" title="Carnegie Mellon University">Carnegie Mellon University</a> as part of the <a href="Andrew_Project" title="Andrew Project">Andrew Project</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Originally named "Vice",<sup id="cite_ref-garfinkel19890506_2-0" class="reference"><a href="#cite_note-garfinkel19890506-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> "Andrew" refers to <a href="Andrew_Carnegie" title="Andrew Carnegie">Andrew Carnegie</a> and <a href="Andrew_W._Mellon" class="mw-redirect" title="Andrew W. Mellon">Andrew Mellon</a>. Its primary use is in <a href="Distributed_computing" title="Distributed computing">distributed computing</a>.

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<div class="mw-heading mw-heading2"><h2 id="Features">Features</h2></div>

<p>AFS<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> has several benefits over traditional networked <a href="File_system" title="File system">file systems</a>, particularly in the areas of security and scalability. One enterprise AFS deployment at <a href="Morgan_Stanley" title="Morgan Stanley">Morgan Stanley</a> exceeds 25,000 clients.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> AFS uses <a href="Kerberos_protocol" class="mw-redirect" title="Kerberos protocol">Kerberos</a> for authentication, and implements <a href="Access_control_list" class="mw-redirect" title="Access control list">access control lists</a> on directories for users and groups. Each client caches files on the local filesystem for increased speed on subsequent requests for the same file. This also allows limited filesystem access in the event of a <a href="Crash_(computing)" title="Crash (computing)">server crash</a> or a <a href="Network_outage" class="mw-redirect" title="Network outage">network outage</a>.

</p><p>AFS uses the <a href="Weak_consistency" title="Weak consistency">weak consistency</a> model.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Read and write operations on an open file are directed only to the locally cached copy. When a modified file is closed, the changed portions are copied back to the file server. Cache consistency is maintained by <a href="Callback_(computer_science)" class="mw-redirect" title="Callback (computer science)">callback</a> mechanism. When a file is cached, the server makes a note of this and promises to inform the client if the file is updated by someone else. Callbacks are discarded and must be re-established after any client, server, or network failure, including a timeout. Re-establishing a callback involves a status check and does not require re-reading the file itself.

</p><p>A consequence of the <a href="File_locking" title="File locking">file locking</a> strategy is that AFS does not support large shared databases or record updating within files shared between client systems. This was a deliberate design decision based on the perceived needs of the university computing environment. For example, in the original email system for the Andrew Project, the Andrew Message System, a single file per message is used, like <a href="Maildir" title="Maildir">maildir</a>, rather than a single file per mailbox, like <a href="Mbox" title="Mbox">mbox</a>. See <a href="File_locking#Buffered_I/O_problems" title="File locking">AFS and buffered I/O Problems</a> for handling shared databases.

</p><p>A significant feature of AFS is the <a href="Volume_(computing)" title="Volume (computing)">volume</a>, a tree of files, sub-directories and AFS <a href="Mount_(computing)" title="Mount (computing)">mountpoints</a> (links to other AFS volumes). Volumes are created by administrators and linked at a specific named path in an AFS cell. Once created, users of the filesystem may create directories and

files as usual without concern for the physical location of the volume. A volume may have a <a href="Disk_quota" title="Disk quota">quota</a> assigned to it in order to limit the amount of space consumed. As needed, AFS administrators can move that volume to another server and disk location without the need to notify users; the operation can even occur while files in that volume are being used.

</p><p>AFS volumes can be replicated to read-only cloned copies. When accessing files in a read-only volume, a client system will retrieve data from a particular read-only copy. If at some point, that copy becomes unavailable, clients will look for any of the remaining copies. Again, users of that data are unaware of the location of the read-only copy; administrators can create and relocate such copies as needed. The AFS command suite guarantees that all read-only volumes contain exact copies of the original read-write volume at the time the read-only copy was created.

</p><p>The file name space on an Andrew workstation is partitioned into a <i>shared</i> and <i>local</i> name space. The shared name space (usually mounted as /afs on the Unix filesystem) is identical on all workstations. The local name space is unique to each workstation. It only contains temporary files needed for workstation initialization and symbolic links to files in the shared name space.

</p><p>The Andrew File System heavily influenced Version 4 of <a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a>' popular <a href="Network_File_System_(protocol)" class="mw-redirect" title="Network File System (protocol)">Network File System</a> (NFS). Additionally, a variant of AFS, the <a href="DCE_Distributed_File_System" title="DCE Distributed File System">DCE Distributed File System</a> (DFS) was adopted by the <a href="Open_Software_Foundation" title="Open Software Foundation">Open Software Foundation</a> in 1989 as part of their <a href="Distributed_Computing_Environment" title="Distributed Computing Environment">Distributed Computing Environment</a>. Finally AFS (version two) was the predecessor of the <a href="Coda_(file_system)" title="Coda (file system)">Coda</a> file system.

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<div class="mw-heading mw-heading2"><h2 id="Implementations">Implementations</h2></div>

<p>Besides the original, a few other implementations were developed. <a href="OpenAFS" title="OpenAFS">OpenAFS</a> was built from source released by <a href="Transarc" title="Transarc">Transarc</a> (<a href="International_Business_Machines" class="mw-redirect" title="International Business Machines">IBM</a>) in 2000.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Transarc software became deprecated and lost support.

Arla was an independent implementation of AFS developed at the <a href="Royal_Institute_of_Technology" class="mw-redirect" title="Royal Institute of Technology">Royal Institute of Technology</a> in <a href="Stockholm" title="Stockholm">Stockholm</a> in the late 1990s and early 2000s.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>A fourth implementation of an AFS client exists in the <a href="Linux_kernel" title="Linux kernel">Linux kernel</a> <a href="Source_code" title="Source code">source code</a> since at least version 2.6.10.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Committed by <a href="Red_Hat" title="Red Hat">Red Hat</a>, this is a fairly simple implementation still incomplete as of January 2024.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Available_permissions">Available permissions</h2></div>

<p>The following Access Control List (ACL) permissions can be granted:

</p>

<dl><dt>Lookup (l)</dt>

<dd>allows a user to list the contents of the AFS directory, examine the ACL associated with the directory and access subdirectories.</dd>

<dt>Insert (i)</dt>

<dd>allows a user to add new files or subdirectories to the directory.</dd>

<dt>Delete (d)</dt>

<dd>allows a user to remove files and subdirectories from the directory.</dd>

<dt>Administer (a)</dt>

<dd>allows a user to change the ACL for the directory. Users always have this right on their home directory, even if they accidentally remove themselves from the ACL.</dd></dl>

<p>Permissions that affect files and subdirectories include:

</p>

<dd>allows a user to look at the contents of files in a directory and list files in subdirectories. Files that are to be granted read access to any user, including the owner, need to have the standard UNIX "owner read" permission set.</dd>

<dt>Write (w)</dt>

<dd>allows a user to modify files in a directory. Files that are to be granted write access to any user, including the owner, need to have the standard UNIX "owner write" <a href="File-system_permissions" title="File-system permissions">permission set</a>.</dd>

<dd>allows the processor to run programs that need to <a href="File_locking" title="File locking">lock</a> files in the directory.</dd></dl>

<p>Additionally, AFS includes Application ACLs (A)-(H) which have no effect on access to files.

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<ul><li><a href="Global_filesystem" class="mw-redirect" title="Global filesystem">Global filesystem</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.cmu.edu/corporate/news/2007/features/andrew/what_is_andrew.shtml">What is Andrew</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110909232809/http://www.cmu.edu/corporate/news/2007/features/andrew/what_is_andrew.shtml">Archived</a> September 9, 2011, at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a> - part of CMU's official site chronicling the history of the <a href="Andrew_Project" title="Andrew Project">Andrew Project</a>.</span>

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</style><cite id="CITEREFGarfinkel,_Simson_L.1989" class="citation news cs1"><a href="Simson_Garfinkel" title="Simson Garfinkel">Garfinkel, Simson L.</a> (May–June 1989). <a rel="nofollow" class="external text" href="http://simson.net/clips/1989/1989.TechRev.Athena.pdf">"Ripples Across the Academic Market"</a> <span class="cs1-format">(PDF)</span>. <i>Technology Review</i>. pp. <span class="nowrap">9–</span>13. <a rel="nofollow" class="external text" href="https://ghostarchive.org/archive/20221009/http://simson.net/clips/1989/1989.TechRev.Athena.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 9 October 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">25 January</span> 2016</span>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFHoward,_J.H.Kazar,_M.L.Nichols,_S.G.Nichols,_D.A.1988" class="citation journal cs1">Howard, J.H.; Kazar, M.L.; Nichols, S.G.; Nichols, D.A.; Satyanarayanan, M.; Sidebotham, R.N. & West, M.J. (February 1988). "Scale and Performance in a Distributed File System". <i>ACM Transactions on Computer Systems</i>. <b>6</b> (1): <span class="nowrap">51–</span>81. <a href="CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.71.5072">10.1.1.71.5072</a></span>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1145%2F35037.35059">10.1145/35037.35059</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:52848606">52848606</a>.</cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFMoore2004" class="citation web cs1">Moore, Phillip (2004). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170709042700/http://www-conf.slac.stanford.edu/AFSBestPractices/Slides/MorganStanley.pdf">"When Your Business Depends On It — The Evolution of a Global File System for a Global Enterprise"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="http://www-conf.slac.stanford.edu/AFSBestPractices/Slides/MorganStanley.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-07-09<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-06-18</span></span>.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFYaniv_Pessach2013" class="citation cs2">Yaniv Pessach (2013), <i>Distributed Storage</i> (Distributed Storage: Concepts, Algorithms, and Implementations ed.), Amazon, <a href="OL_(identifier)" class="mw-redirect" title="OL (identifier)">OL</a> <a rel="nofollow" class="external text" href="https://openlibrary.org/books/OL25423189M">25423189M</a></cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080223002706/http://www-128.ibm.com/developerworks/opensource/library/os-afs.html">Opening Up AFS</a></span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite id="CITEREFAssar_Westerlund_and_Johan_Danielsson1998" class="citation journal cs1">Assar Westerlund and Johan Danielsson (1998). "Arla-a free AFS client". <i>Proceedings of the 1998 USENIX, Freenix Track</i>. <a href="CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.16.1360">10.1.1.16.1360</a></span>.</cite></span>

</li>

<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite id="CITEREFMagnus_Ahltorp,_Love_Hörnquist-Åstrand_and_Assar_Westerlund2000" class="citation journal cs1">Magnus Ahltorp, Love Hörnquist-Åstrand and Assar Westerlund (2000). "Porting the Arla file system to Windows NT". <i>Workshop on Management and Administration of Distributed Environments</i>. <a href="CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.512.9570">10.1.1.512.9570</a></span>.</cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://archive.today/20120710092252/http://lxr.linux.no/source/Documentation/filesystems/afs.txt?v=2.6.10">Linux kernel AFS documentation for 2.6.10</a></span>

</li>

<li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://lxr.linux.no/#linux+v6.7.1/Documentation/filesystems/afs.rst">"Linux kernel AFS documentation for 6.7.1"</a>. <i>linux.no</i>. 7 January 2024<span class="reference-accessdate">. Retrieved <span class="nowrap">11 May</span> 2024</span>.</cite></span>

</li>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.openafs.org/">OpenAFS</a></li>

<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://pages.cs.wisc.edu/~remzi/OSTEP/dist-afs.pdf">The Andrew File System (2014), Arpaci-Dusseau, Remzi H.; Arpaci-Dusseau, Andrea C.; Arpaci-Dusseau Books</a></li></ul>

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</style><div id="File_systems283" style="font-size:114%;margin:0 4em"><a href="File_system" title="File system">File systems</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<ul><li><a href="Comparison_of_file_systems" title="Comparison of file systems">Comparison of file systems</a>

<ul><li><a href="Comparison_of_distributed_file_systems" title="Comparison of distributed file systems">distributed</a></li></ul></li>

<li><a href="Unix_filesystem" title="Unix filesystem">Unix filesystem</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Disk and<br>non-rotating</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="AdvFS" title="AdvFS">AdvFS</a></li>

<li><a href="Amiga_Fast_File_System" title="Amiga Fast File System">Amiga FFS</a></li>

<li><a href="Amiga_Old_File_System" title="Amiga Old File System">Amiga OFS</a></li>

<li><a href="AtheOS_File_System" class="mw-redirect" title="AtheOS File System">AthFS</a></li>

<li><a href="Bcachefs" title="Bcachefs">bcachefs</a></li>

<li>BFS

<ul><li><a href="Be_File_System" title="Be File System">Be File System</a></li>

<li><a href="Boot_File_System" title="Boot File System">Boot File System</a></li>

<li>Byte File System (<a href="Z/VM" title="Z/VM">z/VM</a>)</li></ul></li>

<li><a href="Btrfs" title="Btrfs">Btrfs</a></li>

<li>EFS

<ul><li><a href="Encrypting_File_System" title="Encrypting File System">Encrypting File System</a></li>

<li><a href="Extent_File_System" title="Extent File System">Extent File System</a></li></ul></li>

<li><a href="Episode_filesystem" title="Episode filesystem">Episode</a></li>

<ul><li><a href="ExFAT" title="ExFAT">exFAT</a></li></ul></li>

<li><a href="Files-11" title="Files-11">Files-11</a></li>

<li><a href="Fossil_(file_system)" title="Fossil (file system)">Fossil</a></li>

<li><a href="HAMMER_(file_system)" title="HAMMER (file system)">HAMMER</a>

<ul><li><a href="HAMMER2" title="HAMMER2">HAMMER2</a></li></ul></li>

<li><a href="Hierarchical_File_System_(Apple)" title="Hierarchical File System (Apple)">HFS</a> (<a href="Classic_Mac_OS" title="Classic Mac OS">Classic Mac OS</a>)</li>

<li>MFS

<ul><li><a href="Macintosh_File_System" title="Macintosh File System">Macintosh File System</a></li>

<li><a href="TiVo_Media_File_System" title="TiVo Media File System">TiVo Media File System</a></li></ul></li>

<li><a href="MINIX_file_system" title="MINIX file system">MINIX</a></li>

<li><a href="NetWare_File_System" title="NetWare File System">NetWare File System</a></li>

<li><a href="NILFS" title="NILFS">NILFS</a>

<ul><li><a href="NILFS" title="NILFS">NILFS2</a></li></ul></li>

<li><a href="OneFS_distributed_file_system" title="OneFS distributed file system">OneFS</a></li>

<li><a href="OpenZFS" title="OpenZFS">OpenZFS</a></li>

<li><a href="ReiserFS" title="ReiserFS">ReiserFS</a>

<ul><li><a href="Reiser4" title="Reiser4">Reiser4</a></li></ul></li>

<li><a href="Datalight#Reliance_family" title="Datalight">Reliance</a></li>

<li><a href="Datalight#Reliance_Nitro" title="Datalight">Reliance Nitro</a></li>

<li>SFS

<ul><li>Shared File System (<a href="VM_(operating_system)" title="VM (operating system)">VM</a>)</li>

<li><a href="Smart_File_System" title="Smart File System">Smart File System</a></li></ul></li>

<li><a href="Soup_(Apple)" title="Soup (Apple)">Soup (Apple)</a></li>

<li><a href="UBIFS" title="UBIFS">UBIFS</a></li>

<ul><li><a href="Soft_updates" title="Soft updates">soft updates</a></li>

<li><a href="Write_Ahead_Physical_Block_Logging" title="Write Ahead Physical Block Logging">WAPBL</a></li></ul></li>

<li><a href="Xiafs" title="Xiafs">Xiafs</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Optical_disc" title="Optical disc">Optical disc</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Flash_memory" title="Flash memory">Flash memory</a> and <a href="Solid-state_drive" title="Solid-state drive">SSD</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="ExFAT" title="ExFAT">exFAT</a></li>

<li><a href="EROFS" title="EROFS">EROFS</a></li>

</div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="host-side_wear_leveling27" scope="row" class="navbox-group" style="width:1%">host-side <a href="Wear_leveling" title="Wear leveling">wear leveling</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="LogFS" title="LogFS">LogFS</a></li>

<li><a href="NILFS" title="NILFS">NILFS</a>

<ul><li><a href="NILFS" title="NILFS">NILFS2</a></li></ul></li>

<li><a href="YAFFS" title="YAFFS">YAFFS</a></li>

<li><a href="UBIFS" title="UBIFS">UBIFS</a></li></ul>

</div></td></tr></tbody></table><div>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Clustered_file_system#Distributed_file_systems" title="Clustered file system">Distributed parallel</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="BeeGFS" title="BeeGFS">BeeGFS</a></li>

<li><a href="Google_File_System" title="Google File System">Google File System</a></li>

<li><a href="OrangeFS" title="OrangeFS">OrangeFS</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Network-attached_storage" title="Network-attached storage">NAS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li> (<a href="OpenAFS" title="OpenAFS">OpenAFS</a>)</li>

<li><a href="Google_File_System" title="Google File System">Google File System</a></li>

<li><a href="Lustre_(file_system)" title="Lustre (file system)">Lustre</a></li>

<li><a href="Elliptics" title="Elliptics">POHMELFS</a></li>

<li><a href="Apache_Hadoop" title="Apache Hadoop">Hadoop</a></li>

<li><a href="SSHFS" title="SSHFS">SSHFS</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Specialized</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Boot_File_System" title="Boot File System">Boot File System</a></li>

<li><a href="Compact_Disc_File_System" title="Compact Disc File System">Compact Disc File System</a></li>

<li><a href="Cramfs" title="Cramfs">cramfs</a></li>

<li><a href="Davfs2" title="Davfs2">Davfs2</a></li>

<li><a href="EROFS" title="EROFS">EROFS</a></li>

<li><a href="FTPFS" title="FTPFS">FTPFS</a></li>

<li><a href="SquashFS" title="SquashFS">SquashFS</a></li>

<li><a href="FAT_filesystem_and_Linux" title="FAT filesystem and Linux">UMSDOS</a></li>

<li><a href="OverlayFS" title="OverlayFS">OverlayFS</a></li>

<li><a href="UnionFS" title="UnionFS">UnionFS</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Pseudo</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Configfs" title="Configfs">configfs</a></li>

<li><a href="Device_file" title="Device file">devfs</a></li>

<li><a href="Debugfs" title="Debugfs">debugfs</a></li>

<li><a href="Kernfs_(BSD)" title="Kernfs (BSD)">kernfs</a></li>

<li><a href="Procfs" title="Procfs">procfs</a></li>

<li>specfs</li>

<li><a href="Sysfs" title="Sysfs">sysfs</a></li>

<li><a href="Tmpfs" title="Tmpfs">tmpfs</a></li>

<li><a href="WinFS" title="WinFS">WinFS</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Filesystem-level_encryption" title="Filesystem-level encryption">Encrypted</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ECryptfs" title="ECryptfs">eCryptfs</a></li>

<li><a href="EncFS" title="EncFS">EncFS</a></li>

<li><a href="Rubberhose_(file_system)" class="mw-redirect" title="Rubberhose (file system)">Rubberhose</a></li>

<li><a href="SSHFS" title="SSHFS">SSHFS</a></li>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Clustered_file_system" title="Clustered file system">Clustered</a>

<ul><li><a href="Global_file_system" title="Global file system">Global</a></li>

<li><a href="Self-certifying_File_System" title="Self-certifying File System">Self-certifying</a></li></ul></li>

<li><a href="Flash_file_system" title="Flash file system">Flash</a></li>

<li><a href="Journaling_file_system" title="Journaling file system">Journaling</a></li>

<li><a href="Log-structured_file_system" title="Log-structured file system">Log-structured</a></li>

<li><a href="Object_storage" title="Object storage">Object</a></li>

<li><a href="Record-oriented_filesystem" title="Record-oriented filesystem">Record-oriented</a></li>

<li><a href="Semantic_file_system" title="Semantic file system">Semantic</a></li>

<li><a href="Steganographic_file_system" title="Steganographic file system">Steganographic</a></li>

<li><a href="Synthetic_file_system" title="Synthetic file system">Synthetic</a></li>

<li><a href="Versioning_file_system" title="Versioning file system">Versioning</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Features</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Case_preservation" title="Case preservation">Case preservation</a></li>

<li><a href="Copy-on-write" title="Copy-on-write">Copy-on-write</a></li>

<li><a href="Data_deduplication" title="Data deduplication">Data deduplication</a></li>

<li><a href="Data_scrubbing" title="Data scrubbing">Data scrubbing</a></li>

<li><a href="Execute_in_place" title="Execute in place">Execute in place</a></li>

<li><a href="Extent_(file_systems)" title="Extent (file systems)">Extent</a></li>

<li><a href="File_attribute" title="File attribute">File attribute</a>

<ul><li><a href="Extended_file_attributes" title="Extended file attributes">Extended file attributes</a></li></ul></li>

<li><a href="File_change_log" title="File change log">File change log</a></li>

<li><a href="Inode" title="Inode">Inode</a></li>

<li>Links

<li><a href="Symbolic_link" title="Symbolic link">Symbolic</a></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Computer_access_control" title="Computer access control">Access control</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Access-control_list" title="Access-control list">Access-control list</a></li>

<li><a href="Filesystem-level_encryption" title="Filesystem-level encryption">Filesystem-level encryption</a></li>

<li><a href="File-system_permissions" title="File-system permissions">Permissions</a>

<ul><li><a href="Chmod" title="Chmod">Modes</a></li>

<li><a href="Sticky_bit" title="Sticky bit">Sticky bit</a></li></ul></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Interface_(computing)" title="Interface (computing)">Interfaces</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="File_manager" title="File manager">File manager</a></li>

<li><a href="File_system_API" title="File system API">File system API</a>

<ul><li><a href="Installable_File_System" title="Installable File System">Installable File System</a></li></ul></li>

<li><a href="Virtual_file_system" title="Virtual file system">Virtual file system</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_file_systems" title="List of file systems">Lists</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="List_of_cryptographic_file_systems" title="List of cryptographic file systems">Cryptographic</a></li>

<li><a href="List_of_default_file_systems" title="List of default file systems">Default</a></li>

<li><a href="List_of_log-structured_file_systems" title="List of log-structured file systems">Log-structured</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Layouts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Master_Boot_Record" class="mw-redirect" title="Master Boot Record">Master Boot Record</a></li>

<li><a href="GUID_Partition_Table" title="GUID Partition Table">GUID Partition Table</a></li>

<li><a href="Apple_Partition_Map" title="Apple Partition Map">Apple Partition Map</a></li></ul>

</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-01" href="https://en.wikipedia.org/wiki/?title=Andrew_File_System&oldid=1298314883">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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