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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--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" checked>
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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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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="true">
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<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 md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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Options
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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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<a href="./" class="md-nav__link md-nav__link--active">
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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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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#types" class="md-nav__link">
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<span class="md-ellipsis">
|
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types
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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="#mount-options" class="md-nav__link">
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<span class="md-ellipsis">
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mount options
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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="../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="../branches/" class="md-nav__link">
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<span class="md-ellipsis">
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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="../branches-mount-timeout/" class="md-nav__link">
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<span class="md-ellipsis">
|
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branches-mount-timeout
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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="../functions_categories_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
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functions, categories and policies
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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="../minfreespace/" class="md-nav__link">
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<span class="md-ellipsis">
|
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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="../func_readdir/" class="md-nav__link">
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<span class="md-ellipsis">
|
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func.readdir
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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="../rename_and_link/" class="md-nav__link">
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<span class="md-ellipsis">
|
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rename and link
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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="../moveonenospc/" class="md-nav__link">
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<span class="md-ellipsis">
|
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moveonenospc
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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="../cache/" class="md-nav__link">
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<span class="md-ellipsis">
|
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caching
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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="../passthrough/" class="md-nav__link">
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<span class="md-ellipsis">
|
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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">
|
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<a href="../readahead/" class="md-nav__link">
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<span class="md-ellipsis">
|
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readahead
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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="../inodecalc/" class="md-nav__link">
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<span class="md-ellipsis">
|
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inodecalc
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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="../threads/" class="md-nav__link">
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<span class="md-ellipsis">
|
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threads
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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="../pin-threads/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
pin-threads
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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="../link_cow/" class="md-nav__link">
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<span class="md-ellipsis">
|
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link_cow
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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="../fuse_msg_size/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
|
fuse_msg_size
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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="../follow-symlinks/" class="md-nav__link">
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<span class="md-ellipsis">
|
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follow-symlinks
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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="../link-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
link-exdev
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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="../rename-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
|
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rename-exdev
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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="../symlinkify/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
symlinkify
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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="../nullrw/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
nullrw
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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="../xattr/" class="md-nav__link">
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<span class="md-ellipsis">
|
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xattr
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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="../nfsopenhack/" class="md-nav__link">
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<span class="md-ellipsis">
|
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nfsopenhack
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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="../statfs/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
statfs / statvfs
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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="../flush-on-close/" class="md-nav__link">
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<span class="md-ellipsis">
|
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flush-on-close
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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="../export-support/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
export-support
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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="../kernel-permissions-check/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
|
kernel-permissions-check
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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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</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="../../error_handling_and_logging/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
Error Handling and Logging
|
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|
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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="../../resource_usage/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
Resource Usage and Management
|
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|
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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="../../runtime_interface/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
Runtime Interface
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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="../../remote_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
Remote Filesystems
|
|
|
|
</span>
|
|
|
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|
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</a>
|
|
</li>
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<li class="md-nav__item">
|
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<a href="../../tips_notes/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
Tips and Notes
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|
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</span>
|
|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
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<a href="../../known_issues_bugs/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
|
Known Issues and Bugs
|
|
|
|
</span>
|
|
|
|
|
|
</a>
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<a href="https://github.com/trapexit/mergerfs/edit/master/mkdocs/docs/config/options.md" title="Edit this page" class="md-content__button md-icon" rel="edit">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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<h1 id="options">Options</h1>
|
|
<p>mergerfs has many options to control it many features. For the average
|
|
use case the options listed in the <a href="../../quickstart/">quickstart</a> are
|
|
sufficient. Most options are related to operating system or filesystem
|
|
related concepts so having a <a href="../../intro_to_filesystems/">basic
|
|
background</a> in such things is recommended
|
|
for more advanced configurations.</p>
|
|
<p>These option names and values are the same regardless of whether you
|
|
use them with the <code>mergerfs</code> command line program, in fstab, or in a
|
|
config file.</p>
|
|
<h2 id="types">types</h2>
|
|
<ul>
|
|
<li>BOOL = 'true' | 'false'</li>
|
|
<li>INT = [MIN_INT,MAX_INT]</li>
|
|
<li>UINT = [0,MAX_INT]</li>
|
|
<li>SIZE = 'NNM'; NN = INT, M = 'B' | 'K' | 'M' | 'G' | 'T'</li>
|
|
<li>PAGESIZE = UINT (representing number of pages) | SIZE (in bytes
|
|
which will be converted to pages)</li>
|
|
<li>STR = string (may refer to an enumerated value, see details of
|
|
argument)</li>
|
|
<li>FUNC = filesystem <a href="../functions_categories_policies/">function</a></li>
|
|
<li>CATEGORY = function <a href="../functions_categories_policies/">category</a></li>
|
|
<li>POLICY = mergerfs function <a href="../functions_categories_policies/">policy</a></li>
|
|
</ul>
|
|
<h2 id="mount-options">mount options</h2>
|
|
<ul>
|
|
<li><strong>config</strong>: Path to a config file. Same arguments as below in
|
|
key=val / ini style format.</li>
|
|
<li><strong><a href="../branches/">branches</a></strong>: Colon delimited list of branches. Used
|
|
primarily in config file.</li>
|
|
<li><strong><a href="../branches-mount-timeout/">branches-mount-timeout</a>=UINT</strong>: Number
|
|
of seconds to wait at startup for branches to be a mount other than
|
|
the mountpoint's filesystem. (default: 0)</li>
|
|
<li><strong><a href="../branches-mount-timeout/#branches-mount-timeout-fail">branches-mount-timeout-fail</a>=BOOL</strong>:
|
|
If set to <code>true</code> then if <code>branches-mount-timeout</code> expires it will
|
|
exit rather than continuing. (default: false)</li>
|
|
<li><strong><a href="../minfreespace/">minfreespace</a>=SIZE</strong>: The minimum available
|
|
space of a branch necessary to be considered for a create
|
|
<a href="../functions_categories_policies/">policy</a>. This is a default value
|
|
applied to all branches and can be overwritten when configuring
|
|
<a href="../branches/">branches</a>. Understands 'K', 'M', and 'G' to represent
|
|
kilobyte, megabyte, and gigabyte respectively. (default: 4G)</li>
|
|
<li><strong><a href="../moveonenospc/">moveonenospc</a>=BOOL|POLICY</strong>: When enabled if a
|
|
<strong>write</strong> fails with <strong>ENOSPC</strong> (no space left on device) or
|
|
<strong>EDQUOT</strong> (disk quota exceeded) the policy selected will run to
|
|
find a new location for the file. An attempt to move the file to
|
|
that branch will occur (keeping all metadata possible) and if
|
|
successful the original is unlinked and the write retried. (default:
|
|
pfrd)</li>
|
|
<li><strong><a href="../inodecalc/">inodecalc</a>=passthrough|path-hash|devino-hash|hybrid-hash</strong>:
|
|
Selects the inode calculation algorithm. (default: hybrid-hash)</li>
|
|
<li><strong>dropcacheonclose=BOOL</strong>: When a file is requested to be closed
|
|
call <code>posix_fadvise</code> on it first to instruct the kernel that we no
|
|
longer need the data and it can drop its cache. Recommended when
|
|
<strong>cache.files=partial|full|auto-full|per-process</strong> to limit double
|
|
caching. (default: false)</li>
|
|
<li><strong>direct-io-allow-mmap=BOOL</strong>: On newer kernels (>= 6.6) it is
|
|
possible to disable file page caching while still allowing for
|
|
shared mmap support. mergerfs will enable this feature if available
|
|
but an option is provided to turn it off for testing and debugging
|
|
purposes. (default: true)</li>
|
|
<li><strong><a href="../symlinkify/">symlinkify</a>=BOOL</strong>: When enabled and a file is not
|
|
writable and its mtime or ctime is older than <strong>symlinkify_timeout</strong>
|
|
files will be reported as symlinks to the original files. Please
|
|
read more below before using. (default: false)</li>
|
|
<li><strong><a href="../symlinkify/">symlinkify_timeout</a>=UINT</strong>: Time to wait, in
|
|
seconds, to activate the <strong>symlinkify</strong> behavior. (default: 3600)</li>
|
|
<li><strong>nullrw=BOOL</strong>: Turns reads and writes into no-ops. The request
|
|
will succeed but do nothing. Useful for benchmarking
|
|
mergerfs. (default: false)</li>
|
|
<li><strong>lazy-umount-mountpoint=BOOL</strong>: mergerfs will attempt to "lazy
|
|
umount" the mountpoint before mounting itself. Useful when
|
|
performing live upgrades of mergerfs. May not work on
|
|
FreeBSD. (default: false)</li>
|
|
<li><strong>ignorepponrename=BOOL</strong>: Ignore path preserving on
|
|
rename. Typically rename and link act differently depending on the
|
|
policy of <code>create</code> (read below). Enabling this will cause rename and
|
|
link to always use the non-path preserving behavior. This means
|
|
files, when renamed or linked, will stay on the same
|
|
filesystem. (default: false)</li>
|
|
<li><strong><a href="../export-support/">export-support</a>=BOOL</strong>: Sets a low-level FUSE
|
|
feature intended to indicate the filesystem can support being
|
|
exported via NFS. (default: true)</li>
|
|
<li><strong><a href="../kernel-permissions-check/">kernel-permissions-check</a>=BOOL</strong>:
|
|
Controls the FUSE <code>default_permissions</code> option. Primarily for
|
|
debugging. (default: true)</li>
|
|
<li><strong>security_capability=BOOL</strong>: If false return ENOATTR when xattr
|
|
security.capability is queried. (default: true)</li>
|
|
<li><strong><a href="../xattr/">xattr</a>=passthrough|noattr|nosys</strong>: Runtime control of
|
|
xattrs. Default is to passthrough xattr requests. 'noattr' will
|
|
short circuit as if nothing exists. 'nosys' will respond with ENOSYS
|
|
as if xattrs are not supported or disabled. (default: passthrough)</li>
|
|
<li><strong><a href="../link_cow/">link_cow</a>=BOOL</strong>: When enabled if a regular file is
|
|
opened which has a link count > 1 it will copy the file to a
|
|
temporary file and rename over the original. Breaking the link and
|
|
providing a basic copy-on-write function similar to
|
|
cow-shell. (default: false)</li>
|
|
<li><strong><a href="../statfs/">statfs</a>=base|full</strong>: Controls how statfs works. 'base'
|
|
means it will always use all branches in statfs calculations. 'full'
|
|
is in effect path preserving and only includes branches where the
|
|
path exists. (default: base)</li>
|
|
<li><strong>statfs_ignore=none|ro|nc</strong>: 'ro' will cause statfs calculations to
|
|
ignore available space for branches mounted or tagged as 'read-only'
|
|
or 'no create'. 'nc' will ignore available space for branches tagged
|
|
as 'no create'. (default: none)</li>
|
|
<li><strong>nfsopenhack=off|git|all</strong>: A workaround for exporting mergerfs
|
|
over NFS where there are issues with creating files for write while
|
|
setting the mode to read-only. (default: off)</li>
|
|
<li><strong><a href="../follow-symlinks/">follow-symlinks</a>=never|directory|regular|all</strong>:
|
|
Turns symlinks into what they point to. (default: never)</li>
|
|
<li><strong><a href="../link-exdev/">link-exdev</a>=passthrough|rel-symlink|abs-base-symlink|abs-pool-symlink</strong>:
|
|
When a link fails with EXDEV optionally create a symlink to the file
|
|
instead.</li>
|
|
<li><strong><a href="../rename-exdev/">rename-exdev</a>=passthrough|rel-symlink|abs-symlink</strong>:
|
|
When a rename fails with EXDEV optionally move the file to a special
|
|
directory and symlink to it.</li>
|
|
<li><strong><a href="../readahead/">readahead</a>=UINT</strong>: Set readahead (in kilobytes) for
|
|
mergerfs and branches if greater than 0. (default: 0)</li>
|
|
<li><strong>posix_acl=BOOL</strong>: Enable POSIX ACL support (if supported by kernel
|
|
and underlying filesystem). (default: false)</li>
|
|
<li><strong>async_read=BOOL</strong>: Perform reads asynchronously. If disabled or
|
|
unavailable the kernel will ensure there is at most one pending read
|
|
request per file handle and will attempt to order requests by
|
|
offset. (default: true)</li>
|
|
<li><strong><a href="../fuse_msg_size/">fuse_msg_size</a>=PAGESIZE</strong>: Set the max number of
|
|
pages per FUSE message. Only available on Linux >= 4.20 and ignored
|
|
otherwise. (min: 1; max: 65535; default: "1M")</li>
|
|
<li><strong><a href="../threads/">threads</a>=INT</strong>: Number of threads to use. When used
|
|
alone (<code>process-thread-count=-1</code>) it sets the number of threads
|
|
reading and processing FUSE messages. When used together it sets the
|
|
number of threads reading from FUSE. When set to zero it will
|
|
attempt to discover and use the number of logical cores. If the
|
|
thread count is set negative it will look up the number of cores
|
|
then divide by the absolute value. ie. threads=-2 on an 8 core
|
|
machine will result in 8 / 2 = 4 threads. There will always be at
|
|
least 1 thread. If set to -1 in combination with
|
|
<code>process-thread-count</code> then it will try to pick reasonable values
|
|
based on CPU thread count. NOTE: higher number of threads increases
|
|
parallelism but usually decreases throughput. (default: 0)</li>
|
|
<li><strong><a href="../threads/">read-thread-count</a>=INT</strong>: Alias for <code>threads</code>.</li>
|
|
<li><strong><a href="../threads/">process-thread-count</a>=INT</strong>: Enables separate thread
|
|
pool to asynchronously process FUSE requests. In this mode
|
|
<code>read-thread-count</code> refers to the number of threads reading FUSE
|
|
messages which are dispatched to process threads. -1 means disabled
|
|
otherwise acts like <code>read-thread-count</code>. (default: -1)</li>
|
|
<li><strong><a href="../threads/">process-thread-queue-depth</a>=UINT</strong>: Sets the number
|
|
of requests any single process thread can have queued up at one
|
|
time. Meaning the total memory usage of the queues is queue depth
|
|
multiplied by the number of process threads plus read thread
|
|
count. 0 sets the depth to the same as the process thread
|
|
count. (default: 0)</li>
|
|
<li><strong><a href="../pin-threads/">pin-threads</a>=STR</strong>: Selects a strategy to pin
|
|
threads to CPUs (default: unset)</li>
|
|
<li><strong><a href="../flush-on-close/">flush-on-close</a>=never|always|opened-for-write</strong>:
|
|
Flush data cache on file close. Mostly for when writeback is enabled
|
|
or merging network filesystems. (default: opened-for-write)</li>
|
|
<li><strong>scheduling-priority=INT</strong>: Set mergerfs' scheduling
|
|
priority. Valid values range from -20 to 19. See <code>setpriority</code> man
|
|
page for more details. (default: -10)</li>
|
|
<li><strong>fsname=STR</strong>: Sets the name of the filesystem as seen in
|
|
<strong>mount</strong>, <strong>df</strong>, etc. Defaults to a list of the source paths
|
|
concatenated together with the longest common prefix removed.</li>
|
|
<li><strong><a href="../functions_categories_policies/">func.FUNC</a>=POLICY</strong>: Sets the
|
|
specific FUSE function's policy. See below for the list of value
|
|
types. Example: <strong>func.getattr=newest</strong></li>
|
|
<li><strong><a href="../func_readdir/">func.readdir</a>=seq|cosr|cor|cosr:INT|cor:INT</strong>: Sets <code>readdir</code>
|
|
policy. INT value sets the number of threads to use for
|
|
concurrency. (default: seq)</li>
|
|
<li><strong><a href="../functions_categories_policies/">category.action</a>=POLICY</strong>: Sets
|
|
policy of all FUSE functions in the action category. (default:
|
|
epall)</li>
|
|
<li><strong><a href="../functions_categories_policies/">category.create</a>=POLICY</strong>: Sets
|
|
policy of all FUSE functions in the create category. (default:
|
|
pfrd)</li>
|
|
<li><strong><a href="../functions_categories_policies/">category.search</a>=POLICY</strong>: Sets
|
|
policy of all FUSE functions in the search category. (default: ff)</li>
|
|
<li><strong><a href="../cache/#cachestatfs">cache.statfs</a>=UINT</strong>: 'statfs' cache
|
|
timeout in seconds. (default: 0)</li>
|
|
<li><strong><a href="../cache/#cacheattr">cache.attr</a>=UINT</strong>: File attribute cache
|
|
timeout in seconds. (default: 1)</li>
|
|
<li><strong><a href="../cache/#cacheentry">cache.entry</a>=UINT</strong>: File name lookup cache
|
|
timeout in seconds. (default: 1)</li>
|
|
<li><strong><a href="../cache/#cachenegative_entry">cache.negative_entry</a>=UINT</strong>:
|
|
Negative file name lookup cache timeout in seconds. (default: 0)</li>
|
|
<li><strong><a href="../cache/#cachefiles">cache.files</a>=off|partial|full|auto-full|per-process</strong>:
|
|
File page caching mode (default: off)</li>
|
|
<li><strong>cache.files.process-names=LIST</strong>: A pipe | delimited list of
|
|
process <a href="https://man7.org/linux/man-pages/man5/proc.5.html">comm</a>
|
|
names to enable page caching for when
|
|
<code>cache.files=per-process</code>. (default: "rtorrent|qbittorrent-nox")</li>
|
|
<li><strong><a href="../cache/#cachewriteback">cache.writeback</a>=BOOL</strong>: Enable kernel
|
|
writeback caching (default: false)</li>
|
|
<li><strong><a href="../cache/#cachesymlinks">cache.symlinks</a>=BOOL</strong>: Cache symlinks (if
|
|
supported by kernel) (default: false)</li>
|
|
<li><strong><a href="../cache/#cachereaddir">cache.readdir</a>=BOOL</strong>: Cache readdir (if
|
|
supported by kernel) (default: false)</li>
|
|
<li><strong>parallel-direct-writes=BOOL</strong>: Allow the kernel to dispatch
|
|
multiple, parallel (non-extending) write requests for files opened
|
|
with <code>cache.files=per-process</code> (if the process is not in
|
|
<code>process-names</code>) or <code>cache.files=off</code>. (Is a kernel feature added in
|
|
v6.2) (default: true)</li>
|
|
<li><strong><a href="../passthrough/">passthrough</a></strong>: Enable <a href="https://kernelnewbies.org/Linux_6.9#Faster_FUSE_I.2FO">FUSE IO
|
|
passthrough</a>
|
|
if available. (default: off)</li>
|
|
<li><strong>gid-cache-expire-timeout</strong>: Number of seconds till supplemental
|
|
group data is refreshed in the <a href="../../known_issues_bugs/#supplemental-user-groups">GID
|
|
cache</a>. (default:
|
|
3600)</li>
|
|
<li><strong>gid-cache-remove-timeout</strong>: Number of seconds to wait till cached
|
|
data is removed due to lack of usage. (default: 43200)</li>
|
|
</ul>
|
|
<p><strong>NOTE:</strong> Options are evaluated in the order listed so if the options
|
|
are <strong>func.rmdir=rand,category.action=ff</strong> the <strong>action</strong> category
|
|
setting will override the <strong>rmdir</strong> setting.</p>
|
|
<p><strong>NOTE:</strong> Always look at the documentation for the version of mergerfs
|
|
you're using. Not all features are available in older releases.</p>
|
|
|
|
|
|
|
|
|
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