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44 KiB
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</a>
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</li>
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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="../functions_categories_and_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="../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="../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="../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">
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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">
|
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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">
|
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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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<span class="md-ellipsis">
|
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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">
|
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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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|
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<span class="md-ellipsis">
|
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statfs / statvfs
|
|
</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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|
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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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|
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<span class="md-ellipsis">
|
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export-support
|
|
</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="../../error_handling/" class="md-nav__link">
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<span class="md-ellipsis">
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Error Handling
|
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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_interfaces/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Runtime Interfaces
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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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|
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<span class="md-ellipsis">
|
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Remote Filesystems
|
|
</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="../../tips_notes/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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Tips and Notes
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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="../../known_issues_bugs/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Known Issues and Bugs
|
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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="../../project_comparisons/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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Project Comparisons
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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="../../performance/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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Tweaking Performance
|
|
</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="../../benchmarking/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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Benchmarking
|
|
</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="../../tooling/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Tooling
|
|
</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_14" >
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<label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0">
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<span class="md-ellipsis">
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FAQ
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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_14_label" aria-expanded="false">
|
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<label class="md-nav__title" for="__nav_14">
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<span class="md-nav__icon md-icon"></span>
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FAQ
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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="../../faq/reliability_and_scalability/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Reliability and Scalability
|
|
</span>
|
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|
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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="../../faq/usage_and_functionality/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Usage and Functionality
|
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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="../../faq/configuration_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Configuration 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="../../faq/compatibility_and_integration/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Compatibility and Integration
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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="../../faq/recommendations_and_warnings/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Recommendations and Warnings
|
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</span>
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|
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|
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</a>
|
|
</li>
|
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<h1 id="options">Options</h1>
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<p>These options are the same regardless of whether you use them with the
|
|
<code>mergerfs</code> commandline program, in fstab, or in a config file.</p>
|
|
<h3 id="types">types</h3>
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<ul>
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|
<li>BOOL = 'true' | 'false'</li>
|
|
<li>INT = [MIN_INT,MAX_INT]</li>
|
|
<li>UINT = [0,MAX_INT]</li>
|
|
<li>SIZE = 'NNM'; NN = INT, M = 'K' | 'M' | 'G' | 'T'</li>
|
|
<li>STR = string (may refer to an enumerated value, see details of
|
|
argument)</li>
|
|
<li>FUNC = filesystem function</li>
|
|
<li>CATEGORY = function category</li>
|
|
<li>POLICY = mergerfs function policy</li>
|
|
</ul>
|
|
<h3 id="mount-options">mount options</h3>
|
|
<ul>
|
|
<li><strong>config</strong>: Path to a config file. Same arguments as below in
|
|
key=val / ini style format.</li>
|
|
<li><strong>branches</strong>: Colon delimited list of branches.</li>
|
|
<li><strong>minfreespace=SIZE</strong>: The minimum space value used for creation
|
|
policies. Can be overridden by branch specific option. Understands
|
|
'K', 'M', and 'G' to represent kilobyte, megabyte, and gigabyte
|
|
respectively. (default: 4G)</li>
|
|
<li><strong>moveonenospc=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: false, true = mfs)</li>
|
|
<li><strong>inodecalc=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>symlinkify=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>symlinkify_timeout=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. (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>export-support=BOOL</strong>: Sets a low-level FUSE feature intended to
|
|
indicate the filesystem can support being exported via
|
|
NFS. (default: true)</li>
|
|
<li><strong>security_capability=BOOL</strong>: If false return ENOATTR when xattr
|
|
security.capability is queried. (default: true)</li>
|
|
<li><strong>xattr=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>link_cow=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>statfs=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>branches-mount-timeout=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>follow-symlinks=never|directory|regular|all</strong>: Turns symlinks into
|
|
what they point to. (default: never)</li>
|
|
<li><strong>link-exdev=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>rename-exdev=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>readahead=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>fuse_msg_size=UINT</strong>: Set the max number of pages per FUSE
|
|
message. Only available on Linux >= 4.20 and ignored
|
|
otherwise. (min: 1; max: 256; default: 256)</li>
|
|
<li><strong>threads=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>read-thread-count=INT</strong>: Alias for <code>threads</code>.</li>
|
|
<li><strong>process-thread-count=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>process-thread-queue-depth=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>pin-threads=STR</strong>: Selects a strategy to pin threads to CPUs
|
|
(default: unset)</li>
|
|
<li><strong>flush-on-close=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>func.FUNC=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>func.readdir=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>category.action=POLICY</strong>: Sets policy of all FUSE functions in the
|
|
action category. (default: epall)</li>
|
|
<li><strong>category.create=POLICY</strong>: Sets policy of all FUSE functions in the
|
|
create category. (default: epmfs)</li>
|
|
<li><strong>category.search=POLICY</strong>: Sets policy of all FUSE functions in the
|
|
search category. (default: ff)</li>
|
|
<li><strong>cache.statfs=UINT</strong>: 'statfs' cache timeout in seconds. (default: 0)</li>
|
|
<li><strong>cache.attr=UINT</strong>: File attribute cache timeout in
|
|
seconds. (default: 1)</li>
|
|
<li><strong>cache.entry=UINT</strong>: File name lookup cache timeout in
|
|
seconds. (default: 1)</li>
|
|
<li><strong>cache.negative_entry=UINT</strong>: Negative file name lookup cache
|
|
timeout in seconds. (default: 0)</li>
|
|
<li><strong>cache.files=libfuse|off|partial|full|auto-full|per-process</strong>: File
|
|
page caching mode (default: libfuse)</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>cache.writeback=BOOL</strong>: Enable kernel writeback caching (default:
|
|
false)</li>
|
|
<li><strong>cache.symlinks=BOOL</strong>: Cache symlinks (if supported by kernel)
|
|
(default: false)</li>
|
|
<li><strong>cache.readdir=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>. (This requires kernel support, and was added in v6.2)</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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|
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