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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">
|
|
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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|
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<span class="md-ellipsis">
|
|
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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|
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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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|
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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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|
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|
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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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|
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<span class="md-ellipsis">
|
|
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">
|
|
<a href="../config/fuse_msg_size/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
fuse_msg_size
|
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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/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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</span>
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../config/link-exdev/" class="md-nav__link">
|
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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">
|
|
<a href="../config/rename-exdev/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
rename-exdev
|
|
</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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</a>
|
|
</li>
|
|
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<li class="md-nav__item">
|
|
<a href="../config/nullrw/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
nullrw
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../config/xattr/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
xattr
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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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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<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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|
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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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|
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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>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
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</li>
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|
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<li class="md-nav__item">
|
|
<a href="../error_handling/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Error Handling
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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|
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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>
|
|
|
|
|
|
</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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<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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|
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<a href="./" class="md-nav__link md-nav__link--active">
|
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|
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|
|
<span class="md-ellipsis">
|
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Tips and Notes
|
|
</span>
|
|
|
|
|
|
</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="../known_issues_bugs/" class="md-nav__link">
|
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|
|
|
|
<span class="md-ellipsis">
|
|
Known Issues and Bugs
|
|
</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="../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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|
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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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|
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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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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../tooling/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Tooling
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item md-nav__item--nested">
|
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|
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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">
|
|
|
|
|
|
<span class="md-ellipsis">
|
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FAQ
|
|
</span>
|
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|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false">
|
|
<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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|
|
|
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|
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../faq/reliability_and_scalability/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Reliability and Scalability
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../faq/usage_and_functionality/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Usage and Functionality
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
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<li class="md-nav__item">
|
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<a href="../faq/configuration_and_policies/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Configuration and Policies
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/compatibility_and_integration/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Compatibility and Integration
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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|
|
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|
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<li class="md-nav__item">
|
|
<a href="../faq/recommendations_and_warnings/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Recommendations and Warnings
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
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<a href="../faq/technical_behavior_and_limitations/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Technical Behavior and Limitations
|
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</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../faq/limit_drive_spinup/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Limiting drive spinup
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
|
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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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<h1 id="tips-and-notes">Tips and Notes</h1>
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<ul>
|
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<li>This document is literal and reasonably thorough. If a suspected
|
|
feature isn't mentioned it doesn't exist. If certain <code>libfuse</code>
|
|
arguments aren't listed they probably shouldn't be used.</li>
|
|
<li>Ensure you're using the latest version. Especially before submitting
|
|
bug reports.</li>
|
|
<li>Run mergerfs as <code>root</code>. mergerfs is designed and intended to be run
|
|
as <code>root</code> and may exhibit incorrect behavior if run otherwise.</li>
|
|
<li>If you do not see some directories and files you expect, policies
|
|
seem to skip branches, you get strange permission errors, etc. be
|
|
sure the underlying filesystems' permissions are all the same. Use
|
|
<code>mergerfs.fsck</code> to audit the filesystem for out of sync permissions.</li>
|
|
<li>If you still have permission issues be sure you are using POSIX ACL
|
|
compliant filesystems. mergerfs doesn't generally make exceptions
|
|
for FAT, NTFS, or other non-POSIX filesystem.</li>
|
|
<li>Unless using Linux v6.6 or above do <strong>not</strong> use <code>cache.files=off</code> if
|
|
you expect applications (such as rtorrent) to use
|
|
<a href="http://linux.die.net/man/2/mmap">mmap</a>. Enabling <code>dropcacheonclose</code>
|
|
is recommended when <code>cache.files=auto-full</code>.</li>
|
|
<li><a href="http://kodi.tv">Kodi</a>, <a href="http://plex.tv">Plex</a>,
|
|
<a href="http://subsonic.org">Subsonic</a>, etc. can use directory
|
|
<a href="http://linux.die.net/man/2/stat">mtime</a> to more efficiently
|
|
determine whether to scan for new content rather than simply
|
|
performing a full scan. If using the default <code>getattr</code> policy of
|
|
<code>ff</code> it's possible those programs will miss an update on account of
|
|
it returning the first directory found's <code>stat</code> info and it is a
|
|
later directory on another mount which had the <code>mtime</code> recently
|
|
updated. To fix this you will want to set
|
|
<code>func.getattr=newest</code>. Remember though that this is just <code>stat</code>. If
|
|
the file is later <code>open</code>'ed or <code>unlink</code>'ed and the policy is
|
|
different for those then a completely different file or directory
|
|
could be acted on.</li>
|
|
<li>Some policies mixed with some functions may result in strange
|
|
behaviors. Not that some of these behaviors and race conditions
|
|
couldn't happen outside mergerfs but that they are far more
|
|
likely to occur on account of the attempt to merge multiple sources
|
|
of data which could be out of sync due to the different policies.</li>
|
|
<li>For consistency it's generally best to set <code>category</code> wide policies
|
|
rather than individual <code>func</code>'s. This will help limit the
|
|
confusion of tools such as
|
|
<a href="http://linux.die.net/man/1/rsync">rsync</a>. However, the flexibility
|
|
is there if needed.</li>
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