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<li class="md-nav__item">
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<a href="../../intro_to_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
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Intro to Filesystems
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
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<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0">
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<span class="md-ellipsis">
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Config
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
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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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<ul class="md-nav__list" data-md-scrollfix>
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<a href="../../config/options/" class="md-nav__link">
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<span class="md-ellipsis">
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Options
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</span>
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</a>
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<li class="md-nav__item">
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<a href="../../config/deprecated_options/" class="md-nav__link">
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<span class="md-ellipsis">
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Deprecated Options
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</span>
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</a>
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<li class="md-nav__item">
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<a href="../../config/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="../../config/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="../../config/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 class="md-nav__item">
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<a href="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/passthrough/" class="md-nav__link">
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<span class="md-ellipsis">
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passthrough.io
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../config/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="../../config/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="../../config/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="../../config/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="../../config/proxy-ioprio/" class="md-nav__link">
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<span class="md-ellipsis">
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proxy-ioprio
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/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="../../config/statfs/" class="md-nav__link">
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<span class="md-ellipsis">
|
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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="../../config/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="../../config/export-support/" class="md-nav__link">
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<span class="md-ellipsis">
|
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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="../../config/kernel-permissions-check/" class="md-nav__link">
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<span class="md-ellipsis">
|
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kernel-permissions-check
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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="../../error_handling_and_logging/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Error Handling and Logging
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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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<span class="md-ellipsis">
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Resource Usage and Management
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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">
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Runtime Interface
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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="../../remote_filesystems/" class="md-nav__link">
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<span class="md-ellipsis">
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Remote Filesystems
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|
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</span>
|
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|
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../../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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|
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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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<span class="md-ellipsis">
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Benchmarking
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|
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</span>
|
|
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</a>
|
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</li>
|
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<h1 id="configuration-and-policies">Configuration and Policies</h1>
|
|
<h2 id="what-settings-should-i-use">What settings should I use?</h2>
|
|
<p>Depends on what features you want. Generally, there are no "good",
|
|
"bad", "inefficient", or "optimal" settings. Options are almost
|
|
exclusively functional. Meaning they change the behavior of the
|
|
software. It is best to read over the available options and choose
|
|
what fits your use case. If something is not clear from the
|
|
documentation please reach out and the documentation will be improved.</p>
|
|
<p>The settings described in the <a href="../../quickstart/">Quick Start</a> are
|
|
sufficient for most users.</p>
|
|
<p>Filesystems are complex and use cases numerous. There simply is no way
|
|
to provide a singular setup that works for all situations. Since
|
|
mergerfs <a href="../usage_and_functionality/">does not impact</a> the underlying
|
|
filesystems and can be added or removed without any impact it is
|
|
extremely easy to test and experiment with different settings.</p>
|
|
<p>Additional reading:</p>
|
|
<ul>
|
|
<li><a href="../../config/options/">Config/Options</a></li>
|
|
</ul>
|
|
<h2 id="what-create-policy-should-i-use">What create policy should I use?</h2>
|
|
<p>If it isn't clear to you then you should use <code>pfrd</code> as described in
|
|
the <a href="../../quickstart/">quickstart guide</a>.</p>
|
|
<h2 id="why-is-pfrd-the-default-create-policy">Why is pfrd the default create policy?</h2>
|
|
<p>Originally the default was <code>epmfs</code> however it was found to cause
|
|
significant confusion among new users who assumed mergerfs to behave
|
|
like other software which always choose a branch with most available
|
|
space without any filtering or restrictions. The reason for using
|
|
<code>epmfs</code> was to allow people to use mergerfs without impacting the
|
|
layout of their data across the branches. Keeping the total entropy of
|
|
the system in check. This, however, was not understood by users who
|
|
did not read the documentation and caused significant support burdens.</p>
|
|
<p>For mergerfs v2.41.0 it was decided to change the default to <code>pfrd</code> to
|
|
minimize the support burden.</p>
|
|
<p><code>pfrd</code> was chosen because it prioritizes placement to branches based
|
|
on free space (percentage wise) without overloading a specific branch
|
|
as <code>mfs</code>, <code>lus</code>, or other policies could when a singular branch has
|
|
significantly more free space. Since it is impossible to know the
|
|
usage and access patterns of the filesystem spreading out files across
|
|
the branches also spreads the load and therefore good for general use
|
|
cases making it a good default.</p>
|
|
<p>Additional reading:</p>
|
|
<ul>
|
|
<li><a href="../../config/functions_categories_policies/">functions, categories and policies</a></li>
|
|
</ul>
|
|
<h2 id="how-can-i-ensure-files-are-collocated-on-the-same-branch">How can I ensure files are collocated on the same branch?</h2>
|
|
<p>Many people like the idea of ensuring related files, such as all the
|
|
files to a TV show season or songs in an album, are stored on the same
|
|
storage device. However, most people have no technical need for this
|
|
behavior.</p>
|
|
<ol>
|
|
<li>If you backup your data it is extremely likely your backup solution
|
|
can restore only those files you are missing. There is no need to
|
|
store data in related units to ensure restoring data is easy.</li>
|
|
<li>Software such as <a href="https://sonarr.tv">Sonarr</a> can manage the
|
|
downloading and post processing of bespoke files / episodes which
|
|
may be missing. Either by downloading the episode individually if
|
|
available or by downloading a full season.</li>
|
|
<li>There is no benefit to keeping files collocated with regard to
|
|
drive spinup, caching, or other secondary concern. In fact
|
|
depending on usage patterns placing the data on the same underlying
|
|
device could harm performance.</li>
|
|
</ol>
|
|
<p>The main use case for wanting collocation is where the branch is going
|
|
to be removed from the pool and used in isolation temporarily and you
|
|
wish to have all data from some logical set on that device. Such as
|
|
you intend to take a drive out of the pool to take on a trip and want
|
|
a whole show or artist's works on the drive. However, even in these
|
|
situations you typically end up needing to curate the files anyway
|
|
because it has show A but not show B. In such cases it is more
|
|
convient to use a separate devices and sync what you wish to it.</p>
|
|
<p>All that said you can accomplish collocation to varying degrees using
|
|
the following methods:</p>
|
|
<ol>
|
|
<li>Use
|
|
<a href="https://github.com/trapexit/mergerfs-tools/blob/master/src/mergerfs.consolidate">mergerfs.consolidate</a>
|
|
when consolidation is needed.</li>
|
|
<li>Use a <code>msp</code> create policy to do a best effort collocation without
|
|
needing explicit directory curation.</li>
|
|
<li>Use <code>epmfs</code> or other <code>ep</code> create policy and manually create paths
|
|
on the branches directly as you need/desire.</li>
|
|
<li>Use a <code>ep</code> <code>create</code> policy and <code>pfrd</code> or <code>rand</code> for <code>mkdir</code>.</li>
|
|
</ol>
|
|
<h2 id="how-can-i-balance-files-across-the-pool">How can I balance files across the pool?</h2>
|
|
<p>Similar to collocation there is generally little reason to balance
|
|
files across the pool branches.</p>
|
|
<ol>
|
|
<li>Since prediction of a device's/filesystem's death or loss of data
|
|
is near impossible there is little reason to balance in hopes of
|
|
limiting data loss.</li>
|
|
<li>While performance could be impacted by having too much reading or
|
|
writing happen to singular underlying filesystems balancing won't
|
|
help unless you have the ability to manage the access patterns to
|
|
the pool.</li>
|
|
<li>Over time the churn of adding and removing files will lead to a
|
|
random distribution of files across the branches which is
|
|
effectively "balancing" if using create policies which do not favor
|
|
any particular branch.</li>
|
|
</ol>
|
|
<p>All that said if you wish to move files around or balance the pool you
|
|
can:</p>
|
|
<ol>
|
|
<li>Use <code>rand</code> or <code>pfrd</code> create policies and just use your system as
|
|
normal.</li>
|
|
<li>Write scripts using rsync or similar to move files around as you
|
|
wish.</li>
|
|
<li>Use
|
|
<a href="https://github.com/trapexit/mergerfs-tools/blob/master/src/mergerfs.balance">mergerfs.balance</a>. Keep
|
|
in mind that this tool is really just an example of how to
|
|
accomplish such a task. The tool does not keep track of links so
|
|
you may encounter an increase in used space if you rely on links to
|
|
reduce redundancy. However, you can run a file dedup program like
|
|
<a href="https://github.com/pauldreik/rdfind">rdfind</a> to restore the links.</li>
|
|
</ol>
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