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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/deprecated_options/" class="md-nav__link">
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<span class="md-ellipsis">
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Deprecated Options
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/branches/" class="md-nav__link">
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<span class="md-ellipsis">
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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>
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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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|
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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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|
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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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|
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<span class="md-ellipsis">
|
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|
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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">
|
|
<a href="../config/pin-threads/" class="md-nav__link">
|
|
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|
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|
|
<span class="md-ellipsis">
|
|
|
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|
|
pin-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">
|
|
<a href="../config/proxy-ioprio/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
proxy-ioprio
|
|
|
|
|
|
|
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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="../config/link-cow/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
link-cow
|
|
|
|
|
|
|
|
</span>
|
|
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|
|
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|
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</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/fuse-msg-size/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
fuse-msg-size
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
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</a>
|
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</li>
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../config/follow-symlinks/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
follow-symlinks
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/link-exdev/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
link-exdev
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/rename-exdev/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
rename-exdev
|
|
|
|
|
|
|
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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="../config/symlinkify/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
symlinkify
|
|
|
|
|
|
|
|
</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="../config/nullrw/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
nullrw
|
|
|
|
|
|
|
|
</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="../config/xattr/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
xattr
|
|
|
|
|
|
|
|
</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="../config/nfsopenhack/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
nfsopenhack
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../config/statfs/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
statfs / statvfs
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/flush-on-close/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
flush-on-close
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
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</a>
|
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</li>
|
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|
|
|
|
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../config/export-support/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
export-support
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../config/kernel-permissions-check/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
kernel-permissions-check
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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|
|
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|
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|
|
|
|
|
|
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|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../config/lazy-umount-mountpoint/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
lazy-umount-mountpoint
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../error_handling_and_logging/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Error Handling and Logging
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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|
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|
|
|
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|
|
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|
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<li class="md-nav__item">
|
|
<a href="../resource_usage/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Resource Usage
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../runtime_interface/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Runtime Interface
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../remote_filesystems/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Remote Filesystems
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../tips_notes/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Tips and Notes
|
|
|
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../known_issues_bugs/" class="md-nav__link">
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
|
|
|
Known Issues and Bugs
|
|
|
|
|
|
|
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</span>
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<svg xmlns="http://www.w3.org/2000/svg" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" class="lucide lucide-file-code-2" viewBox="0 0 24 24"><path d="M4 12.15V4a2 2 0 0 1 2-2h8a2.4 2.4 0 0 1 1.706.706l3.588 3.588A2.4 2.4 0 0 1 20 8v12a2 2 0 0 1-2 2h-3.35"/><path d="M14 2v5a1 1 0 0 0 1 1h5M5 16l-3 3 3 3M9 22l3-3-3-3"/></svg>
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<h1 id="extended-usage-patterns">Extended Usage Patterns</h1>
|
|
<h2 id="tiered-cache">tiered cache</h2>
|
|
<p>Some storage technologies support what is called "tiered" caching. The
|
|
placing of smaller, faster storage as a transparent cache to larger,
|
|
slower storage. NVMe, SSD, or Optane in front of traditional HDDs for
|
|
instance.</p>
|
|
<p>mergerfs does not natively support any sort of tiered caching
|
|
currently. The truth is for many users a cache would have little or no
|
|
advantage over reading and writing directly. They would be
|
|
bottlenecked by their network, internet connection, or limited size of
|
|
the cache. However, there are a few situations where a tiered cache
|
|
setup could help.</p>
|
|
<ol>
|
|
<li>Fast network, slow filesystems, many readers: You've a 10Gbps+
|
|
network with many readers and your regular filesystems can't keep
|
|
up.</li>
|
|
<li>Fast network, slow filesystems, small'ish bursty writes: You have
|
|
a 10Gbps+ network and wish to transfer amounts of data less than
|
|
your cache filesystem but wish to do so quickly and the time
|
|
between bursts is long enough to migrate data.</li>
|
|
</ol>
|
|
<p>With #1 it's arguable if you should be using mergerfs at all. A RAID
|
|
level that can aggregate performance or using higher performance
|
|
storage would probably be the better solution. If you're going to use
|
|
mergerfs there are other tactics that may help: spreading the data
|
|
across filesystems (see the mergerfs.dup tool) and setting
|
|
<code>func.open=rand</code> or using dm-cache or a similar technology to add
|
|
tiered cache to the underlying device itself.</p>
|
|
<p>With #2 one could use a block cache solution as available via LVM and
|
|
dm-cache but there is another solution which requires only mergerfs, a
|
|
script to move files around, and a cron job to run said script.</p>
|
|
<ul>
|
|
<li>Create two mergerfs pools. One which includes just the <strong>slow</strong>
|
|
branches and one which has <strong>both</strong> the <strong>fast</strong> branches
|
|
(SSD,NVME,etc.) and <strong>slow</strong> branches. The <strong>base</strong> pool and the
|
|
<strong>cache</strong> pool.</li>
|
|
<li>The <strong>cache</strong> pool should have the cache branches listed first in
|
|
the branch list in order to to make it easier to prioritize them.</li>
|
|
<li>The best <code>create</code> policies to use for the <strong>cache</strong> pool would
|
|
probably be <code>ff</code>, <code>lus</code>, or <code>lfs</code>. The latter two under the
|
|
assumption that the cache filesystem(s) are far smaller than the
|
|
backing filesystems.</li>
|
|
<li>You can also set the <strong>slow</strong> branches' mode to <code>NC</code> which would
|
|
give you the ability to use other <code>create</code> policies though that'd
|
|
mean if the cache filesystems fill you'd get "out of space"
|
|
errors. This however may be good as it would indicate the script
|
|
moving files around is not configured properly.</li>
|
|
<li>Set your programs to use the <strong>cache</strong> pool.</li>
|
|
<li>Configure the <strong>base</strong> pool with the <code>create</code> policy you would like
|
|
to lay out files as you like.</li>
|
|
<li>Use monstermuffin's
|
|
<a href="https://github.com/monstermuffin/mergerfs-cache-mover">mergerfs-cache-mover</a>,
|
|
one of the scripts below, or create your own. The script's
|
|
responsibility is to move files from the <strong>cache</strong> branches (not
|
|
pool) to the <strong>base</strong> pool.</li>
|
|
<li>Use <code>cron</code> (as root) to schedule the command at whatever frequency
|
|
is appropriate for your workflow.</li>
|
|
</ul>
|
|
<p><strong>NOTE:</strong> Due to the additional overhead it is not recommended to nest
|
|
or otherwise create hierarchies of mergerfs pools. It will work but
|
|
the latency increases will further harm performance. Even when using
|
|
passthrough IO or other features.</p>
|
|
<h3 id="time-based-expiring">time based expiring</h3>
|
|
<p><strong>NOTE:</strong> this script is an <strong>example</strong>, not particularly efficient, and
|
|
really not intended for production deployments. Until such time that
|
|
mergerfs provides tooling for this usecase consider using
|
|
<a href="https://github.com/monstermuffin/mergerfs-cache-mover">mergerfs-cache-mover</a>.</p>
|
|
<p>Move files from cache filesystem to base pool which have an access
|
|
time older than the supplied number of days. Replace <code>-atime</code> with
|
|
<code>-amin</code> in the script if you want minutes rather than days.</p>
|
|
<p><strong>NOTE:</strong> The arguments to these scripts include the cache
|
|
<strong>filesystem</strong> itself. Not the pool with the cache filesystem. You
|
|
could have data loss if the source is the cache pool.</p>
|
|
<p><a href="https://github.com/trapexit/mergerfs/blob/latest-release/tools/mergerfs.time-based-mover?raw=1">mergerfs.time-based-mover</a></p>
|
|
<p>Download:
|
|
<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>curl -o /usr/local/bin/mergerfs.time-based-mover https://raw.githubusercontent.com/trapexit/mergerfs/refs/heads/latest-release/tools/mergerfs.time-based-mover
|
|
</span></code></pre></div></p>
|
|
<p>crontab entry:
|
|
<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># m h dom mon dow command
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>0 * * * * /usr/local/bin/mergerfs.time-based-mover /mnt/ssd/cache00 /mnt/base-pool 1
|
|
</span></code></pre></div></p>
|
|
<p>If you have more than one cache filesystem then simply add a cron
|
|
entry for each.</p>
|
|
<p>If you want to only move files from a subdirectory then use the
|
|
subdirectories. <code>/mnt/ssd/cache00/foo</code> and <code>/mnt/base-pool/foo</code>
|
|
respectively.</p>
|
|
<h3 id="percentage-full-expiring">percentage full expiring</h3>
|
|
<p><strong>NOTE:</strong> this script is an <strong>example</strong>, not particularly efficient, and
|
|
really not intended for production deployments. Until such time that
|
|
mergerfs provides tooling for this usecase consider using
|
|
<a href="https://github.com/monstermuffin/mergerfs-cache-mover">mergerfs-cache-mover</a>.</p>
|
|
<p>While the cache filesystem's percentage full is above the provided
|
|
value move the oldest file from the cache filesystem to the base pool.</p>
|
|
<p><strong>NOTE:</strong> The arguments to these scripts include the cache
|
|
<strong>filesystem</strong> itself. Not the pool with the cache filesystem. You
|
|
could have data loss if the source is the cache pool.</p>
|
|
<p><a href="https://github.com/trapexit/mergerfs/blob/latest-release/tools/mergerfs.percent-full-mover?raw=1">mergerfs.percent-full-mover</a></p>
|
|
<p>Download:
|
|
<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>curl -o /usr/local/bin/mergerfs.percent-full-mover https://raw.githubusercontent.com/trapexit/mergerfs/refs/heads/latest-release/tools/mergerfs.percent-full-mover
|
|
</span></code></pre></div></p>
|
|
<p>crontab entry:
|
|
<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># m h dom mon dow command
|
|
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>0 * * * * /usr/local/bin/mergerfs.percent-full-mover /mnt/ssd/cache00 /mnt/base-pool 80
|
|
</span></code></pre></div></p>
|
|
<p>If you have more than one cache filesystem then simply add a cron
|
|
entry for each.</p>
|
|
<p>If you want to only move files from a subdirectory then use the
|
|
subdirectories. <code>/mnt/ssd/cache00/foo</code> and <code>/mnt/base-pool/foo</code>
|
|
respectively.</p>
|
|
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