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${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'ee70dbc174'
${ noResults }
mergerfs/preview/index.html

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<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="mergerfs - a featureful union filesystem">
<link rel="canonical" href="https://trapexit.github.io/mergerfs/preview/">
<link rel="next" href="quickstart/">
<link rel="icon" href="logo.png">
<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.6.15">
<title>mergerfs</title>
<link rel="stylesheet" href="assets/stylesheets/main.342714a4.min.css">
<link rel="stylesheet" href="assets/stylesheets/palette.06af60db.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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</head>
<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
<label class="md-overlay" for="__drawer"></label>
<div data-md-component="skip">
<a href="#mergerfs-a-featureful-union-filesystem" class="md-skip">
Skip to content
</a>
</div>
<div data-md-component="announce">
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<div data-md-color-scheme="default" data-md-component="outdated" hidden>
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<nav class="md-header__inner md-grid" aria-label="Header">
<a href="." title="mergerfs" class="md-header__button md-logo" aria-label="mergerfs" data-md-component="logo">
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</label>
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<div class="md-header__ellipsis">
<div class="md-header__topic">
<span class="md-ellipsis">
mergerfs
</span>
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Home
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</label>
<div class="md-search" data-md-component="search" role="dialog">
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
<label class="md-search__icon md-icon" for="__search">
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<nav class="md-search__options" aria-label="Search">
<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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</button>
</nav>
<div class="md-search__suggest" data-md-component="search-suggest"></div>
</form>
<div class="md-search__output">
<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
<div class="md-search-result" data-md-component="search-result">
<div class="md-search-result__meta">
Initializing search
</div>
<ol class="md-search-result__list" role="presentation"></ol>
</div>
</div>
</div>
</div>
</div>
<div class="md-header__source">
<a href="https://github.com/trapexit/mergerfs" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.7.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
</div>
<div class="md-source__repository">
mergerfs
</div>
</a>
</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
<label class="md-nav__title" for="__drawer">
<a href="." title="mergerfs" class="md-nav__button md-logo" aria-label="mergerfs" data-md-component="logo">
<img src="logo.png" alt="logo">
</a>
mergerfs
</label>
<div class="md-nav__source">
<a href="https://github.com/trapexit/mergerfs" title="Go to repository" class="md-source" data-md-component="source">
<div class="md-source__icon md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.7.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81"/></svg>
</div>
<div class="md-source__repository">
mergerfs
</div>
</a>
</div>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--active">
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<span class="md-ellipsis">
Home
</span>
<span class="md-nav__icon md-icon"></span>
</label>
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<span class="md-ellipsis">
Home
</span>
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
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<li class="md-nav__item">
<a href="#features" class="md-nav__link">
<span class="md-ellipsis">
Features
</span>
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<li class="md-nav__item">
<a href="#non-features" class="md-nav__link">
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Non-features
</span>
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How it works
</span>
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<nav class="md-nav" aria-label="How it works">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#visualization" class="md-nav__link">
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Visualization
</span>
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</ul>
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<li class="md-nav__item">
<a href="#getting-started" class="md-nav__link">
<span class="md-ellipsis">
Getting Started
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<a href="quickstart/" class="md-nav__link">
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QuickStart
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" >
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Installation
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<span class="md-nav__icon md-icon"></span>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
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Installation
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
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Installation
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<a href="setup/upgrade/" class="md-nav__link">
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Upgrade
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<a href="setup/build/" class="md-nav__link">
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Build
</span>
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</li>
<li class="md-nav__item">
<a href="terminology/" class="md-nav__link">
<span class="md-ellipsis">
Terminology
</span>
</a>
</li>
<li class="md-nav__item">
<a href="intro_to_filesystems/" class="md-nav__link">
<span class="md-ellipsis">
Intro to Filesystems
</span>
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0">
<span class="md-ellipsis">
Config
</span>
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_6">
<span class="md-nav__icon md-icon"></span>
Config
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="config/options/" class="md-nav__link">
<span class="md-ellipsis">
Options
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/deprecated_options/" class="md-nav__link">
<span class="md-ellipsis">
Deprecated Options
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/branches/" class="md-nav__link">
<span class="md-ellipsis">
branches
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/branches-mount-timeout/" class="md-nav__link">
<span class="md-ellipsis">
branches-mount-timeout
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/functions_categories_policies/" class="md-nav__link">
<span class="md-ellipsis">
functions, categories and policies
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/minfreespace/" class="md-nav__link">
<span class="md-ellipsis">
minfreespace
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/func_readdir/" class="md-nav__link">
<span class="md-ellipsis">
func.readdir
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/rename_and_link/" class="md-nav__link">
<span class="md-ellipsis">
rename and link
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/moveonenospc/" class="md-nav__link">
<span class="md-ellipsis">
moveonenospc
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/cache/" class="md-nav__link">
<span class="md-ellipsis">
caching
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/passthrough/" class="md-nav__link">
<span class="md-ellipsis">
passthrough
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/readahead/" class="md-nav__link">
<span class="md-ellipsis">
readahead
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/inodecalc/" class="md-nav__link">
<span class="md-ellipsis">
inodecalc
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/threads/" class="md-nav__link">
<span class="md-ellipsis">
threads
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/pin-threads/" class="md-nav__link">
<span class="md-ellipsis">
pin-threads
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/link_cow/" class="md-nav__link">
<span class="md-ellipsis">
link_cow
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/fuse_msg_size/" class="md-nav__link">
<span class="md-ellipsis">
fuse_msg_size
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/follow-symlinks/" class="md-nav__link">
<span class="md-ellipsis">
follow-symlinks
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/link-exdev/" class="md-nav__link">
<span class="md-ellipsis">
link-exdev
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/rename-exdev/" class="md-nav__link">
<span class="md-ellipsis">
rename-exdev
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/symlinkify/" class="md-nav__link">
<span class="md-ellipsis">
symlinkify
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/nullrw/" class="md-nav__link">
<span class="md-ellipsis">
nullrw
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/xattr/" class="md-nav__link">
<span class="md-ellipsis">
xattr
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/nfsopenhack/" class="md-nav__link">
<span class="md-ellipsis">
nfsopenhack
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/statfs/" class="md-nav__link">
<span class="md-ellipsis">
statfs / statvfs
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/flush-on-close/" class="md-nav__link">
<span class="md-ellipsis">
flush-on-close
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/export-support/" class="md-nav__link">
<span class="md-ellipsis">
export-support
</span>
</a>
</li>
<li class="md-nav__item">
<a href="config/kernel-permissions-check/" class="md-nav__link">
<span class="md-ellipsis">
kernel-permissions-check
</span>
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="error_handling_and_logging/" class="md-nav__link">
<span class="md-ellipsis">
Error Handling and Logging
</span>
</a>
</li>
<li class="md-nav__item">
<a href="runtime_interfaces/" class="md-nav__link">
<span class="md-ellipsis">
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<a href="https://github.com/trapexit/mergerfs/edit/master/mkdocs/docs/index.md" title="Edit this page" class="md-content__button md-icon" rel="edit">
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<h1 id="mergerfs-a-featureful-union-filesystem">mergerfs - a featureful union filesystem</h1>
<p><strong>mergerfs</strong> is a
<a href="https://en.wikipedia.org/wiki/Filesystem_in_Userspace">FUSE</a> based
<a href="https://en.wikipedia.org/wiki/Union_mount">union filesystem</a> geared
towards simplifying storage and management of files across numerous
commodity storage devices. It is similar to <strong>mhddfs</strong>, <strong>unionfs</strong>,
and <strong>aufs</strong>.</p>
<h2 id="features">Features</h2>
<ul>
<li>Logically combine numerous filesystems/paths into a single
mount point</li>
<li>Combine paths of the same or different filesystems</li>
<li>Ability to add or remove filesystems/paths without impacting the
rest of the data</li>
<li>Unaffected by individual filesystem failure</li>
<li>Configurable file selection and creation placement</li>
<li>Works with filesystems of any size</li>
<li>Works with filesystems of almost any type</li>
<li>Ignore read-only filesystems when creating files</li>
<li>Hard link copy-on-write / CoW</li>
<li>Runtime configurable</li>
<li>Support for extended attributes (xattrs)</li>
<li>Support for file attributes (chattr)</li>
<li>Support for POSIX ACLs</li>
</ul>
<h2 id="non-features">Non-features</h2>
<ul>
<li>Read/write overlay on top of read-only filesystem like OverlayFS</li>
<li>File whiteout</li>
<li>RAID like parity calculation</li>
<li>Redundancy</li>
<li>Splitting of files across branches</li>
</ul>
<h2 id="how-it-works">How it works</h2>
<p>mergerfs logically merges multiple filesystem paths together. Not
block devices, not filesystem mounts, just paths. It acts as a proxy
to the underlying filesystem paths. Combining the behaviors of some
functions and being a selector for others.</p>
<p>When the contents of a directory are requested mergerfs combines the
list of files from each directory, deduplicating entries, and returns
that list.</p>
<p>When a file or directory is created a policy is first run to determine
which branch will be selected for the creation.</p>
<p>For functions which change attributes or remove the file the behavior
may be applied to all instances found.</p>
<p>Read more about <a href="config/functions_categories_policies/">policies
here</a>.</p>
<h3 id="visualization">Visualization</h3>
<div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>A + B = C
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>/disk1 /disk2 /merged
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>| | |
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>+-- /dir1 +-- /dir1 +-- /dir1
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>| | | | | |
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>| +-- file1 | +-- file2 | +-- file1
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>| | +-- file3 | +-- file2
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>+-- /dir2 | | +-- file3
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>| | +-- /dir3 |
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a>| +-- file4 | +-- /dir2
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>| +-- file5 | |
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>+-- file6 | +-- file4
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> |
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> +-- /dir3
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> | |
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> | +-- file5
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> |
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> +-- file6
</span></code></pre></div>
<h2 id="getting-started">Getting Started</h2>
<p>Head to the <a href="quickstart/">quick start guide</a>.</p>
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