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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/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="../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/functions_categories_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
|
|
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/func_readdir/" class="md-nav__link">
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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="../config/rename_and_link/" class="md-nav__link">
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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="../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/readahead/" class="md-nav__link">
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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="../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/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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|
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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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|
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<span class="md-ellipsis">
|
|
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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|
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<span class="md-ellipsis">
|
|
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">
|
|
<a href="../config/symlinkify/" class="md-nav__link">
|
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|
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|
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<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">
|
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<a href="../config/nullrw/" class="md-nav__link">
|
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|
|
|
|
<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">
|
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<a href="../config/xattr/" class="md-nav__link">
|
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|
|
|
|
<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>
|
|
|
|
|
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</a>
|
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</li>
|
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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>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/export-support/" class="md-nav__link">
|
|
|
|
|
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<span class="md-ellipsis">
|
|
export-support
|
|
</span>
|
|
|
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|
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</a>
|
|
</li>
|
|
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|
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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">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Error Handling
|
|
</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">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Runtime Interfaces
|
|
</span>
|
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|
|
|
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</a>
|
|
</li>
|
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|
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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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|
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<li class="md-nav__item">
|
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<a href="../tips_notes/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tips and Notes
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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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
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../project_comparisons/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Project Comparisons
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../performance/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tweaking Performance
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../benchmarking/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Benchmarking
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item md-nav__item--active">
|
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|
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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">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tooling
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<a href="./" class="md-nav__link md-nav__link--active">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tooling
|
|
</span>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<label class="md-nav__title" for="__toc">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Table of contents
|
|
</label>
|
|
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#preloadso" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
preload.so
|
|
</span>
|
|
</a>
|
|
|
|
<nav class="md-nav" aria-label="preload.so">
|
|
<ul class="md-nav__list">
|
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|
|
<li class="md-nav__item">
|
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<a href="#casual-usage" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
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casual usage
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#docker-and-podman-usage" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Docker and Podman usage
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#systemd-unit" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
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systemd unit
|
|
</span>
|
|
</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">
|
|
<a href="#misc" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Misc
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
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|
|
</ul>
|
|
|
|
</nav>
|
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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
|
|
</span>
|
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|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
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|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false">
|
|
<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
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
|
<a href="../faq/reliability_and_scalability/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Reliability and Scalability
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../faq/usage_and_functionality/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Usage and Functionality
|
|
</span>
|
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|
|
|
|
</a>
|
|
</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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Compatibility and Integration
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Technical Behavior and Limitations
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Limiting drive spinup
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Misc
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<a href="https://github.com/trapexit/mergerfs/tree/master/mkdocs/docs/tooling.md" title="Edit this page" class="md-content__button md-icon">
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<h1 id="tooling">Tooling</h1>
|
|
<h2 id="preloadso">preload.so</h2>
|
|
<p>EXPERIMENTAL</p>
|
|
<p>For some time there has been work to enable passthrough IO in
|
|
FUSE. Passthrough IO would allow for near native performance with
|
|
regards to reads and writes (at the expense of certain mergerfs
|
|
features.) In Linux v6.9 that feature made its way into the kernel
|
|
however in a somewhat limited form which is incompatible with aspects
|
|
of how mergerfs currently functions. While work will continue to
|
|
support passthrough IO in mergerfs this library was created to offer
|
|
similar functionality in a more limited way.</p>
|
|
<p><code>/usr/lib/mergerfs/preload.so</code></p>
|
|
<p>This <a href="https://man7.org/linux/man-pages/man8/ld.so.8.html#ENVIRONMENT">preloadable
|
|
library</a>
|
|
overrides the creation and opening of files in order to simulate
|
|
passthrough file IO. It catches the open/creat/fopen calls, has
|
|
mergerfs do the call, queries mergerfs for the branch the file exists
|
|
on, reopens the file on the underlying filesystem and returns that
|
|
instead. Meaning that you will get native read/write performance
|
|
because mergerfs is no longer part of the workflow. Keep in mind that
|
|
this also means certain mergerfs features that work by interrupting
|
|
the read/write workflow, such as <code>moveonenospc</code>, will no longer work.</p>
|
|
<p>Also, understand that this will only work on dynamically linked
|
|
software. Anything statically compiled will not work. Many GoLang and
|
|
Rust apps are statically compiled.</p>
|
|
<p>The library will not interfere with non-mergerfs filesystems. The
|
|
library is written to always fallback to returning the mergerfs opened
|
|
file on error.</p>
|
|
<p>While the library was written to account for a number of edgecases
|
|
there could be some yet accounted for so please report any oddities.</p>
|
|
<p>Thank you to
|
|
<a href="https://github.com/nohajc/mergerfs-io-passthrough">nohajc</a> for
|
|
prototyping the idea.</p>
|
|
<h3 id="casual-usage">casual usage</h3>
|
|
<div class="language-sh highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nv">LD_PRELOAD</span><span class="o">=</span>/usr/lib/mergerfs/preload.so<span class="w"> </span>touch<span class="w"> </span>/mnt/mergerfs/filename
|
|
</span></code></pre></div>
|
|
<p>Or run <code>export LD_PRELOAD=/usr/lib/mergerfs/preload.so</code> in your shell
|
|
or place it in your shell config file to have it be picked up by all
|
|
software ran from your shell.</p>
|
|
<h3 id="docker-and-podman-usage">Docker and Podman usage</h3>
|
|
<p>Assume <code>/mnt/fs0</code> and <code>/mnt/fs1</code> are pooled with mergerfs at <code>/media</code>.</p>
|
|
<p>All mergerfs branch paths <em>must</em> be bind mounted into the container at
|
|
the same path as found on the host so the preload library can see
|
|
them.</p>
|
|
<p><strong>NOTE:</strong> Since a container can have its own OS setup there is no
|
|
guarentee that <code>preload.so</code> from the host install will be compatible
|
|
with the loader found in the container. If that is true it simply
|
|
won't work and shouldn't cause any issues.</p>
|
|
<div class="language-sh highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>docker<span class="w"> </span>run<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span>-e<span class="w"> </span><span class="nv">LD_PRELOAD</span><span class="o">=</span>/usr/lib/mergerfs/preload.so<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span>-v<span class="w"> </span>/usr/lib/mergerfs/preload.so:/usr/lib/mergerfs/preload.so:ro<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span>-v<span class="w"> </span>/media:/media<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span>-v<span class="w"> </span>/mnt:/mnt<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span>ubuntu:latest<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span>bash
|
|
</span></code></pre></div>
|
|
<p>or more explicitly</p>
|
|
<div class="language-sh highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>docker<span class="w"> </span>run<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span>-e<span class="w"> </span><span class="nv">LD_PRELOAD</span><span class="o">=</span>/usr/lib/mergerfs/preload.so<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span>-v<span class="w"> </span>/usr/lib/mergerfs/preload.so:/usr/lib/mergerfs/preload.so:ro<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span>-v<span class="w"> </span>/media:/media<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span>-v<span class="w"> </span>/mnt/fs0:/mnt/fs0<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span>-v<span class="w"> </span>/mnt/fs1:/mnt/fs1<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span>ubuntu:latest<span class="w"> </span><span class="se">\</span>
|
|
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span>bash
|
|
</span></code></pre></div>
|
|
<h3 id="systemd-unit">systemd unit</h3>
|
|
<p>Use the <code>Environment</code> option to set the LD_PRELOAD variable.</p>
|
|
<ul>
|
|
<li><a href="https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#Command%20lines">https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html#Command%20lines</a></li>
|
|
<li><a href="https://serverfault.com/questions/413397/how-to-set-environment-variable-in-systemd-service">https://serverfault.com/questions/413397/how-to-set-environment-variable-in-systemd-service</a></li>
|
|
</ul>
|
|
<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>[Service]
|
|
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>Environment=LD_PRELOAD=/usr/lib/mergerfs/preload.so
|
|
</span></code></pre></div>
|
|
<h2 id="misc">Misc</h2>
|
|
<ul>
|
|
<li>https://github.com/trapexit/mergerfs-tools</li>
|
|
<li>mergerfs.ctl: A tool to make it easier to query and configure mergerfs at runtime</li>
|
|
<li>mergerfs.fsck: Provides permissions and ownership auditing and the ability to fix them</li>
|
|
<li>mergerfs.dedup: Will help identify and optionally remove duplicate files</li>
|
|
<li>mergerfs.dup: Ensure there are at least N copies of a file across the pool</li>
|
|
<li>mergerfs.balance: Rebalance files across filesystems by moving them from the most filled to the least filled</li>
|
|
<li>mergerfs.consolidate: move files within a single mergerfs directory to the filesystem with most free space</li>
|
|
<li>https://github.com/trapexit/scorch</li>
|
|
<li>scorch: A tool to help discover silent corruption of files and keep track of files</li>
|
|
<li>https://github.com/trapexit/bbf</li>
|
|
<li>bbf (bad block finder): a tool to scan for and 'fix' hard drive bad blocks and find the files using those blocks</li>
|
|
</ul>
|
|
|
|
|
|
|
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