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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 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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</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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<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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</a>
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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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<a href="../config/functions_categories_policies/" class="md-nav__link">
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functions, categories and policies
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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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<a href="../config/func_readdir/" class="md-nav__link">
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func.readdir
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</a>
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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 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 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 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 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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<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="../runtime_interfaces/" class="md-nav__link">
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<span class="md-ellipsis">
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Runtime Interfaces
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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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</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="../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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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../performance/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Tweaking Performance
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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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</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="../tooling/" class="md-nav__link">
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<span class="md-ellipsis">
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Tooling
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
|
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|
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<span class="md-ellipsis">
|
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Usage Patterns
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</span>
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<span class="md-nav__icon md-icon"></span>
|
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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|
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<span class="md-ellipsis">
|
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Usage Patterns
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|
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</span>
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</a>
|
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<a href="https://github.com/trapexit/mergerfs/edit/master/mkdocs/docs/usage_patterns.md" title="Edit this page" class="md-content__button md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg>
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<h1 id="usage-patterns">Usage Patterns</h1>
|
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<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,
|
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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 10+Gbps
|
|
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 10+Gbps 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>, using <code>symlinkify</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>Save one of the below scripts 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>
|
|
<h3 id="time-based-expiring">time based expiring</h3>
|
|
<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>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
|
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