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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" >
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<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="0">
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<span class="md-ellipsis">
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Installation
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
|
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<label class="md-nav__title" for="__nav_3">
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<span class="md-nav__icon md-icon"></span>
|
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Installation
|
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="setup/installation/" class="md-nav__link">
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<span class="md-ellipsis">
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Installation
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="setup/upgrade/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Upgrade
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="setup/build/" class="md-nav__link">
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<span class="md-ellipsis">
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Build
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="terminology/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Terminology
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="intro_to_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Intro to Filesystems
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
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<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0">
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<span class="md-ellipsis">
|
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Config
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</span>
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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|
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_6">
|
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<span class="md-nav__icon md-icon"></span>
|
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Config
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="config/options/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Options
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/deprecated_options/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Deprecated Options
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/branches/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
branches
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/branches-mount-timeout/" class="md-nav__link">
|
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|
|
<span class="md-ellipsis">
|
|
branches-mount-timeout
|
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|
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</span>
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|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/functions_categories_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
functions, categories and policies
|
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</span>
|
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|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/minfreespace/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
minfreespace
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="config/func_readdir/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
func.readdir
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|
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</span>
|
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|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="config/rename_and_link/" class="md-nav__link">
|
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|
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|
|
<span class="md-ellipsis">
|
|
rename and link
|
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|
|
</span>
|
|
|
|
|
|
</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="config/moveonenospc/" class="md-nav__link">
|
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|
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|
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|
|
<span class="md-ellipsis">
|
|
moveonenospc
|
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|
|
</span>
|
|
|
|
|
|
</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="config/cache/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
caching
|
|
|
|
</span>
|
|
|
|
|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/passthrough/" class="md-nav__link">
|
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|
|
|
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|
|
<span class="md-ellipsis">
|
|
passthrough
|
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|
|
</span>
|
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|
|
</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="config/readahead/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
readahead
|
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|
|
</span>
|
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|
|
|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/inodecalc/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
inodecalc
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
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<a href="config/threads/" class="md-nav__link">
|
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|
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|
|
|
<span class="md-ellipsis">
|
|
threads
|
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|
|
</span>
|
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|
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|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/pin-threads/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
pin-threads
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/link_cow/" class="md-nav__link">
|
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|
|
|
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|
|
<span class="md-ellipsis">
|
|
link_cow
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/fuse_msg_size/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
fuse_msg_size
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/follow-symlinks/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
follow-symlinks
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
|
<a href="config/link-exdev/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
link-exdev
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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<li class="md-nav__item">
|
|
<a href="config/rename-exdev/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
rename-exdev
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
|
<a href="config/symlinkify/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
symlinkify
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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<li class="md-nav__item">
|
|
<a href="config/nullrw/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nullrw
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/xattr/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
xattr
|
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|
|
</span>
|
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|
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|
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</a>
|
|
</li>
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<li class="md-nav__item">
|
|
<a href="config/nfsopenhack/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nfsopenhack
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="config/statfs/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
statfs / statvfs
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
|
<a href="config/flush-on-close/" class="md-nav__link">
|
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|
|
|
|
|
|
<span class="md-ellipsis">
|
|
flush-on-close
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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<li class="md-nav__item">
|
|
<a href="config/export-support/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
export-support
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
<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>
|
|
|
|
|
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|
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|
|
</ul>
|
|
</nav>
|
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|
</li>
|
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|
<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>
|
|
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<li class="md-nav__item">
|
|
<a href="resource_usage/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Resource Usage and Management
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="runtime_interface/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Runtime Interface
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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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 <a href="project_comparisons/"><strong>mhddfs</strong>, <strong>unionfs</strong>,
|
|
<strong>aufs</strong>, <strong>DrivePool</strong>, etc.</a></p>
|
|
<h2 id="features">Features</h2>
|
|
<ul>
|
|
<li>Logically combine numerous filesystems/paths into a single
|
|
mount point (JBOFS: Just a Bunch of FileSystems)</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>File IO <a href="config/passthrough/">passthrough</a> for near native IO
|
|
performance (where supported)</li>
|
|
<li>Works with filesystems of any size</li>
|
|
<li>Works with filesystems of <a href="faq/compatibility_and_integration/#what-filesystems-can-be-used-as-branches">almost any
|
|
type</a></li>
|
|
<li>Ignore read-only filesystems when creating files</li>
|
|
<li><a href="faq/technical_behavior_and_limitations/#do-hard-links-work">Hard links</a></li>
|
|
<li>Hard link <a href="config/link_cow/">copy-on-write / CoW</a></li>
|
|
<li><a href="runtime_interface/">Runtime configurable</a></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 (see <a href="https://www.snapraid.it">SnapRAID</a>)</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>The way in which mergerfs behaves is controlled by the
|
|
<a href="config/options/">config/options/settings</a>. More specifically by
|
|
<a href="config/functions_categories_policies/">policies</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
|
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</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 | | | +-- file1
|
|
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>| | +-- file2 | +-- file2
|
|
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>| | +-- file3 | +-- file3
|
|
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>| | |
|
|
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a>+-- /dir2 | +-- /dir2
|
|
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>| | | | |
|
|
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>| +-- file4 | | +-- 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 +-- /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 | +-- 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 | +-- file6
|
|
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>+-- file7 +-- file7 +-- file7
|
|
</span></code></pre></div>
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<h2 id="getting-started">Getting Started</h2>
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<p>Head to the <a href="quickstart/">quick start guide</a>.</p>
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