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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">
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<a href="../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="../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 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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branches
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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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branches
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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="#branch-mode" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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branch mode
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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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|
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<li class="md-nav__item">
|
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<a href="#globbing" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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globbing
|
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</span>
|
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</a>
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|
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</li>
|
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|
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<li class="md-nav__item">
|
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<a href="#branch-setup" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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branch setup
|
|
</span>
|
|
</a>
|
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|
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<nav class="md-nav" aria-label="branch setup">
|
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<ul class="md-nav__list">
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|
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<li class="md-nav__item">
|
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<a href="#layout" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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layout
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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="#permissions-and-mode" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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permissions and mode
|
|
</span>
|
|
</a>
|
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|
|
<nav class="md-nav" aria-label="permissions and mode">
|
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<ul class="md-nav__list">
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|
|
<li class="md-nav__item">
|
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<a href="#mount-points" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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mount points
|
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</span>
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</a>
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</li>
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|
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<li class="md-nav__item">
|
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<a href="#mounted-filesystems" class="md-nav__link">
|
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<span class="md-ellipsis">
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mounted filesystems
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</span>
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</a>
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</li>
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</ul>
|
|
</nav>
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</li>
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<li class="md-nav__item">
|
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<a href="#formatting" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
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formatting
|
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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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</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="../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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|
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<span class="md-ellipsis">
|
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functions, categories and policies
|
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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="../minfreespace/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
|
minfreespace
|
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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="../func_readdir/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
caching
|
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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="../readahead/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
threads
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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="../pin-threads/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
pin-threads
|
|
|
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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="../link_cow/" class="md-nav__link">
|
|
|
|
|
|
|
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<span class="md-ellipsis">
|
|
link_cow
|
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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="../fuse_msg_size/" class="md-nav__link">
|
|
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|
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<span class="md-ellipsis">
|
|
fuse_msg_size
|
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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="../follow-symlinks/" class="md-nav__link">
|
|
|
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|
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|
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<span class="md-ellipsis">
|
|
follow-symlinks
|
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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="../link-exdev/" class="md-nav__link">
|
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|
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|
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|
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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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|
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<span class="md-ellipsis">
|
|
rename-exdev
|
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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="../symlinkify/" class="md-nav__link">
|
|
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|
|
<span class="md-ellipsis">
|
|
symlinkify
|
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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="../nullrw/" class="md-nav__link">
|
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|
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|
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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">
|
|
xattr
|
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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">
|
|
<a href="../nfsopenhack/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nfsopenhack
|
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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">
|
|
<a href="../statfs/" class="md-nav__link">
|
|
|
|
|
|
|
|
<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">
|
|
flush-on-close
|
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|
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</span>
|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../export-support/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
export-support
|
|
|
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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="../kernel-permissions-check/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
kernel-permissions-check
|
|
|
|
</span>
|
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|
|
|
|
</a>
|
|
</li>
|
|
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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">
|
|
|
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|
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|
|
<span class="md-ellipsis">
|
|
Error Handling and Logging
|
|
|
|
</span>
|
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</a>
|
|
</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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|
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|
|
<span class="md-ellipsis">
|
|
Runtime Interfaces
|
|
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../../remote_filesystems/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Remote Filesystems
|
|
|
|
</span>
|
|
|
|
|
|
</a>
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<a href="https://github.com/trapexit/mergerfs/edit/master/mkdocs/docs/config/branches.md" title="Edit this page" class="md-content__button md-icon">
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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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</a>
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<h1 id="branches">branches</h1>
|
|
<p>The <code>branches</code> argument is a colon (':') delimited list of paths to be
|
|
pooled together. It does not matter if the paths are on the same or
|
|
different filesystems nor does it matter <a href="../../faq/compatibility_and_integration/#what-filesystems-can-be-used-as-branches">the filesystem
|
|
type</a>
|
|
(within reason). Used and available space metrics will not be
|
|
duplicated for paths on the same filesystem and any features which
|
|
aren't supported by the underlying filesystem (such as file attributes
|
|
or extended attributes) will return the appropriate errors.</p>
|
|
<p>Branches currently have two options which can be set. A
|
|
<a href="#branch-mode">mode</a> which impacts whether or not the branch is
|
|
included in a policy calculation and a individual
|
|
<a href="#minfreespace">minfreespace</a> value. The values are set by
|
|
prepending an <code>=</code> at the end of a branch designation and using commas
|
|
as delimiters. Example: <code>/mnt/drive=RW,1234</code></p>
|
|
<h3 id="branch-mode">branch mode</h3>
|
|
<ul>
|
|
<li>RW: (read/write) - Default behavior. Will be eligible in all policy
|
|
categories.</li>
|
|
<li>RO: (read-only) - Will be excluded from <code>create</code> and <code>action</code>
|
|
policies. Same as a read-only mounted filesystem would be (though
|
|
faster to process).</li>
|
|
<li>NC: (no-create) - Will be excluded from <code>create</code> policies. You can't
|
|
create on that branch but you can change or delete.</li>
|
|
</ul>
|
|
<h3 id="minfreespace">minfreespace</h3>
|
|
<p>Same purpose and syntax as the <a href="../minfreespace/">global option</a> but
|
|
specific to the branch. Defaults to the global value.</p>
|
|
<h3 id="globbing">globbing</h3>
|
|
<p>To make it easier to include multiple branches mergerfs supports
|
|
<a href="http://linux.die.net/man/7/glob">globbing</a>. <strong>The globbing tokens
|
|
MUST be escaped when using via the shell else the shell itself will
|
|
apply the glob itself.</strong></p>
|
|
<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># mergerfs /mnt/hdd\*:/mnt/ssd /media
|
|
</span></code></pre></div>
|
|
<p>The above line will use all directories in /mnt prefixed with <strong>hdd</strong>
|
|
as well as <strong>ssd</strong>.</p>
|
|
<p>To have the pool mounted at boot or otherwise accessible from related
|
|
tools use <code>/etc/fstab</code>.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a># <file system> <mount point> <type> <options> <dump> <pass>
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>/mnt/hdd*:/mnt/ssd /media mergerfs minfreespace=16G 0 0
|
|
</span></code></pre></div>
|
|
<p><strong>NOTE:</strong> The globbing is done at mount or when updated using the
|
|
runtime API. If a new directory is added matching the glob after the
|
|
fact it will not be automatically included.</p>
|
|
<p>A convenient way to configure branches is to use
|
|
<a href="../../quickstart/#etcfstab-w-config-file">symlinks</a>.</p>
|
|
<h2 id="branch-setup">branch setup</h2>
|
|
<p>mergerfs does not require any special setup of branch paths in order
|
|
to be used however here are some suggestions.</p>
|
|
<h3 id="layout">layout</h3>
|
|
<p>When you have a large collection of storage devices, types of storage,
|
|
and types of interconnects it can be useful to have a verbose naming
|
|
convention. My preference is to create a directory within <code>/mnt/</code> for
|
|
each major type of storage device and/or interconnect. <code>hdd</code> for
|
|
traditional hard drives; <code>ssd</code> for slower SATA based SSDs; <code>nvme</code> for
|
|
M.2 or U.2 NVME SSDs; <code>remote</code> for NFS, SMB, sshfs, etc.</p>
|
|
<p>The mount points within those directories are named after the size of
|
|
the storage and its serial number in the case of physical storage and
|
|
the hostname and remote filesystem for remote.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>$ ls -lh /mnt/
|
|
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>total 16K
|
|
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>drwxr-xr-x 8 root root 4.0K Aug 18 2024 hdd
|
|
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>drwxr-xr-x 6 root root 4.0K Oct 8 2024 nvme
|
|
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>drwxr-xr-x 3 root root 4.0K Aug 24 2024 remote
|
|
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>drwxr-xr-x 3 root root 4.0K Jul 14 2024 ssd
|
|
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
|
|
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a>$ ls -lh /mnt/hdd/
|
|
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>total 8K
|
|
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a>d--------- 2 root root 4.0K Apr 14 15:58 10T-01234567
|
|
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a>d--------- 2 root root 4.0K Apr 12 20:51 20T-12345678
|
|
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a>
|
|
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>$ ls -lh /mnt/nvme/
|
|
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a>total 8K
|
|
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a>d--------- 2 root root 4.0K Apr 14 16:00 1T-ABCDEFGH
|
|
</span><span id="__span-2-16"><a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a>d--------- 2 root root 4.0K Apr 14 23:24 1T-BCDEFGHI
|
|
</span><span id="__span-2-17"><a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a>
|
|
</span><span id="__span-2-18"><a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a>$ ls -lh /mnt/remote/
|
|
</span><span id="__span-2-19"><a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a>total 8K
|
|
</span><span id="__span-2-20"><a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a>d--------- 2 root root 4.0K Apr 12 20:23 foo-sshfs
|
|
</span><span id="__span-2-21"><a id="__codelineno-2-21" name="__codelineno-2-21" href="#__codelineno-2-21"></a>d--------- 2 root root 4.0K Apr 12 20:24 bar-nfs
|
|
</span><span id="__span-2-22"><a id="__codelineno-2-22" name="__codelineno-2-22" href="#__codelineno-2-22"></a>
|
|
</span><span id="__span-2-23"><a id="__codelineno-2-23" name="__codelineno-2-23" href="#__codelineno-2-23"></a># You can find the serial number of a drive using lsblk
|
|
</span><span id="__span-2-24"><a id="__codelineno-2-24" name="__codelineno-2-24" href="#__codelineno-2-24"></a>$ lsblk -d -o NAME,PATH,SIZE,SERIAL
|
|
</span><span id="__span-2-25"><a id="__codelineno-2-25" name="__codelineno-2-25" href="#__codelineno-2-25"></a>NAME PATH SIZE SERIAL
|
|
</span><span id="__span-2-26"><a id="__codelineno-2-26" name="__codelineno-2-26" href="#__codelineno-2-26"></a>sda /dev/sda 9.1T 01234567
|
|
</span><span id="__span-2-27"><a id="__codelineno-2-27" name="__codelineno-2-27" href="#__codelineno-2-27"></a>sdb /dev/sdb 18.2T 12345678
|
|
</span><span id="__span-2-28"><a id="__codelineno-2-28" name="__codelineno-2-28" href="#__codelineno-2-28"></a>nvme0n1 /dev/nvme0n1 953.9G ABCDEFGH
|
|
</span><span id="__span-2-29"><a id="__codelineno-2-29" name="__codelineno-2-29" href="#__codelineno-2-29"></a>nvme1n1 /dev/nvme1n1 953.9G BCDEFGHI
|
|
</span></code></pre></div>
|
|
<h3 id="permissions-and-mode">permissions and mode</h3>
|
|
<h4 id="mount-points">mount points</h4>
|
|
<p>To ensure the directory is <strong>only</strong> used as a point to mount another
|
|
filesystem it is good to lock it down as much as possible. Be sure to
|
|
do this <strong>before</strong> mounting a filesystem to it.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>$ sudo chown root:root /mnt/hdd/10T-XYZ
|
|
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>$ sudo chmod 0000 /mnt/hdd/10T-XYZ
|
|
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>$ sudo setfattr -n user.mergerfs.branch_mounts_here
|
|
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>$ sudo chattr +i /mnt/hdd/10T-XYZ
|
|
</span></code></pre></div>
|
|
<p>The extended attribute <code>user.mergerfs.branch_mounts_here</code> is used by
|
|
the <a href="../branches_mount_timeout/">branches-mount-timeout</a> option to
|
|
recognize whether or not a mergerfs branch path points to the intended
|
|
filesystem.</p>
|
|
<p>The <code>chattr</code> is likely to only work on EXT{2,3,4} filesystems but will
|
|
restrict even <code>root</code> from modifying the directory or its content.</p>
|
|
<h4 id="mounted-filesystems">mounted filesystems</h4>
|
|
<p>For those new to Linux, intending to be the primary individual logged
|
|
into the system, or simply want to simplify permissions it is
|
|
recommended to set the root of mounted filesystems like <code>/tmp/</code> is set
|
|
to. Owned by <code>root</code>, <code>ugo+rwx</code> and <a href="https://en.wikipedia.org/wiki/Sticky_bit">sticky
|
|
bit</a> set.</p>
|
|
<p>This must be done <strong>after</strong> mounting the filesystem to the target
|
|
mount point.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>$ sudo chown root:root /mnt/hdd/10T-SERIALNUM
|
|
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>$ sudo chmod 1777 /mnt/hdd/10T-SERIALNUM
|
|
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>$ sudo setfattr -n user.mergerfs.branch /mnt/hdd/10T-SERIALNUM
|
|
</span></code></pre></div>
|
|
<h3 id="formatting">formatting</h3>
|
|
<p>While even less relevant to mergerfs than the details above the topic
|
|
does com up regularly with mergerfs users. When it comes to
|
|
partitioning and formatting it is suggested to keep things
|
|
simple. Most users of mergerfs will be using the whole drive capacity
|
|
and as such have a singular partition and filesystem on that
|
|
partition. Something many people don't realize is that the partition
|
|
is not necessary and actually can become problematic.</p>
|
|
<p>Rather than creating paritions just format the block device. Let's use
|
|
<code>/dev/sda</code> as an example.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>$ lsblk -d -o NAME,PATH,SERIAL /dev/sda
|
|
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>NAME PATH SERIAL
|
|
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>sda /dev/sda 01234567
|
|
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>
|
|
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a>$ sudo mkfs.ext4 -m0 -L 01234567 /dev/sda
|
|
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a>mke2fs 1.47.0 (5-Feb-2023)
|
|
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>Discarding device blocks: done
|
|
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a>Creating filesystem with 262144 4k blocks and 65536 inodes
|
|
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a>Filesystem UUID: ede8bf96-9aff-464e-a4fb-a4ab8a197cd7
|
|
</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a>Superblock backups stored on blocks:
|
|
</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a> 32768, 98304, 163840, 229376
|
|
</span><span id="__span-5-12"><a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a>
|
|
</span><span id="__span-5-13"><a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a>Allocating group tables: done
|
|
</span><span id="__span-5-14"><a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a>Writing inode tables: done
|
|
</span><span id="__span-5-15"><a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a>Creating journal (8192 blocks): done
|
|
</span><span id="__span-5-16"><a id="__codelineno-5-16" name="__codelineno-5-16" href="#__codelineno-5-16"></a>Writing superblocks and filesystem accounting information: done
|
|
</span></code></pre></div>
|
|
<p>You can then use the serial number as the identifier in <code>fstab</code>.</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a># <file system> <mount point> <type> <options> <dump> <pass>
|
|
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a>LABEL=01234567 /mnt/hdd/10TB-01234567 auto nofail 0 2
|
|
</span></code></pre></div>
|
|
<p>Benefits of doing it this way?</p>
|
|
<ul>
|
|
<li>One less thing (partitions) to configure and worry about.</li>
|
|
<li>Guarantees alignment of blocks</li>
|
|
<li>Makes it easier to use the drive with different enclosures. Some
|
|
SATA to USB adapters use 4K blocks while the drive itself is using
|
|
512b. If you create partitions with one block size and move the
|
|
drive to a controller that uses the other the offset on the device
|
|
where the filesystem starts will be misinterpreted. It is possible
|
|
to manually fix this but it isn't well documented and avoidable.</li>
|
|
</ul>
|
|
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