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<span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5"> <span class="md-nav__icon md-icon"></span> Config </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../config/options/" class="md-nav__link"> <span class="md-ellipsis"> Options </span>
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<li class="md-nav__item"> <a href="../config/deprecated_options/" class="md-nav__link"> <span class="md-ellipsis"> Deprecated Options </span>
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</a> </li>
<li class="md-nav__item"> <a href="../config/func_readdir/" class="md-nav__link"> <span class="md-ellipsis"> func.readdir </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/rename_and_link/" class="md-nav__link"> <span class="md-ellipsis"> rename and link </span>
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</a> </li>
<li class="md-nav__item"> <a href="../config/inodecalc/" class="md-nav__link"> <span class="md-ellipsis"> inodecalc </span>
</a> </li>
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</a> </li>
<li class="md-nav__item"> <a href="../config/pin-threads/" class="md-nav__link"> <span class="md-ellipsis"> pin-threads </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/link_cow/" class="md-nav__link"> <span class="md-ellipsis"> link_cow </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/fuse_msg_size/" class="md-nav__link"> <span class="md-ellipsis"> fuse_msg_size </span>
</a> </li>
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</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 </span>
</a> </li>
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</a> </li>
<li class="md-nav__item"> <a href="../config/nullrw/" class="md-nav__link"> <span class="md-ellipsis"> nullrw </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/xattr/" class="md-nav__link"> <span class="md-ellipsis"> xattr </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/nfsopenhack/" class="md-nav__link"> <span class="md-ellipsis"> nfsopenhack </span>
</a> </li>
<li class="md-nav__item"> <a href="../config/statfs/" class="md-nav__link"> <span class="md-ellipsis"> statfs / statvfs </span>
</a> </li>
<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>
<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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<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>
<li class="md-nav__item"> <a href="../runtime_interfaces/" class="md-nav__link"> <span class="md-ellipsis"> Runtime Interfaces </span>
</a> </li>
<li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type="checkbox" id="__toc"> <label class="md-nav__link md-nav__link--active" for="__toc"> <span class="md-ellipsis"> Remote Filesystems </span>
<span class="md-nav__icon md-icon"></span> </label> <a href="./" class="md-nav__link md-nav__link--active"> <span class="md-ellipsis"> Remote Filesystems </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="#nfs" class="md-nav__link"> <span class="md-ellipsis"> NFS </span> </a> </li> <li class="md-nav__item"> <a href="#smb-cifs" class="md-nav__link"> <span class="md-ellipsis"> SMB / CIFS </span> </a> </li> <li class="md-nav__item"> <a href="#sshfs" class="md-nav__link"> <span class="md-ellipsis"> SSHFS </span> </a> </li> <li class="md-nav__item"> <a href="#other" class="md-nav__link"> <span class="md-ellipsis"> Other </span> </a> </li> </ul> </nav> </li>
<li class="md-nav__item"> <a href="../tips_notes/" class="md-nav__link"> <span class="md-ellipsis"> Tips and Notes </span>
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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>
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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>
<li class="md-nav__item"> <a href="../performance/" class="md-nav__link"> <span class="md-ellipsis"> Tweaking Performance </span>
</a> </li>
<li class="md-nav__item"> <a href="../benchmarking/" class="md-nav__link"> <span class="md-ellipsis"> Benchmarking </span>
</a> </li>
<li class="md-nav__item"> <a href="../tooling/" class="md-nav__link"> <span class="md-ellipsis"> Tooling </span>
</a> </li>
<li class="md-nav__item"> <a href="../usage_patterns/" class="md-nav__link"> <span class="md-ellipsis"> Usage Patterns </span>
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<li class="md-nav__item"> <a href="../faq/why_isnt_it_working/" class="md-nav__link"> <span class="md-ellipsis"> "Why isn't it working?" </span>
</a> </li>
<li class="md-nav__item"> <a href="../faq/limit_drive_spinup/" class="md-nav__link"> <span class="md-ellipsis"> Limiting drive spinup </span>
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<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="#nfs" class="md-nav__link"> <span class="md-ellipsis"> NFS </span> </a> </li> <li class="md-nav__item"> <a href="#smb-cifs" class="md-nav__link"> <span class="md-ellipsis"> SMB / CIFS </span> </a> </li> <li class="md-nav__item"> <a href="#sshfs" class="md-nav__link"> <span class="md-ellipsis"> SSHFS </span> </a> </li> <li class="md-nav__item"> <a href="#other" class="md-nav__link"> <span class="md-ellipsis"> Other </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset">
<a href="https://github.com/trapexit/mergerfs/edit/master/mkdocs/docs/remote_filesystems.md" title="Edit this page" class="md-content__button md-icon"> <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> </a> <a href="https://github.com/trapexit/mergerfs/raw/master/mkdocs/docs/remote_filesystems.md" title="View source of this page" class="md-content__button md-icon"> <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> </a>
<h1 id="remote-filesystems">Remote Filesystems</h1><p>Many users ask about compatibility with remote filesystems. Thissection is to describe any known issues or quirks when using mergerfswith common remote filesystems.</p><p>Keep in mind that, like with caching, it is <strong>NOT</strong> a good idea tochange the contents of the remote filesystem<a href="https://en.wikipedia.org/wiki/Out-of-band">out-of-band</a>. Meaning thatyou should not change the contents of the underlying filesystems ormergerfs on the server hosting the remote filesystem. Doing so canlead to weird behavior, inconsistency, errors, and even datacorruption should multiple programs try to write or read the same dataat the same time. This isn't to say you can't do it or that datacorruption is likely but it <em>could</em> happen. It is better to always usethe remote filesystem. Even on the machine serving it.</p><h2 id="nfs">NFS</h2><p><a href="https://en.wikipedia.org/wiki/Network_File_System">NFS</a> is a commonremote filesystem on Unix/POSIX systems. Due to how NFS works thereare some settings which need to be set in order for mergerfs to workwith it.</p><p>It should be noted that NFS and FUSE (the technology mergerfs uses) donot work perfectly with one another due to certain design choices inFUSE (and mergerfs.) Due to these issues, it is generally recommendedto use SMB when possible. That said mergerfs should generally work asan export of NFS and issues discovered should still be reported.</p><p>To ensure compatibility between mergerfs and NFS use the followingsettings.</p><p>mergerfs settings:</p><ul><li><code>noforget</code></li><li><code>inodecalc=path-hash</code></li></ul><p>NFS export settings:</p><ul><li><code>fsid=UUID</code></li><li><code>no_root_squash</code></li></ul><p><code>noforget</code> is needed because NFS uses the <code>name_to_handle_at</code> and<code>open_by_handle_at</code> functions which allow a program to keep areference to a file without technically having it open in the typicalsense. The problem is that FUSE has no way to know that NFS has ahandle that it will later use to open the file again. As a result, itis possible for the kernel to tell mergerfs to forget about the nodeand should NFS ever ask for that node's details in the future it wouldhave nothing to respond with. Keeping nodes around forever is notideal but at the moment the only way to manage the situation.</p><p><code>inodecalc=path-hash</code> is needed because NFS is sensitive toout-of-band changes. FUSE doesn't care if a file's inode value changesbut NFS, being stateful, does. So if you used the default inodecalculation algorithm then it is possible that if you changed a fileor updated a directory the file mergerfs will use will be on adifferent branch and therefore the inode would change. This isn't anideal solution and others are being considered but it works for mostsituations.</p><p><code>fsid=UUID</code> is needed because FUSE filesystems don't have different<code>st_dev</code> values which can cause issues when exporting. The easiestthing to do is set each mergerfs export <code>fsid</code> to some randomvalue. An easy way to generate a random value is to use the commandline tool <code>uuid</code> or <code>uuidgen</code> or through a website such as<a href="https://www.uuidgenerator.net/">uuidgenerator.net</a>.</p><p><code>no_root_squash</code> is not strictly necessary but can lead to confusingpermission and ownership issues if root squashing is enabled. mergerfsneeds to run certain commands as <code>root</code> and if root squash is enabledit NFS will tell mergerfs a non-root user is making certain calls.</p><h2 id="smb-cifs">SMB / CIFS</h2><p><a href="https://en.wikipedia.org/wiki/Server_Message_Block">SMB</a> is aprotocol most used by Microsoft Windows systems to share file shares,printers, etc. However, due to the popularity of Windows, it is alsosupported on many other platforms including Linux. The most popularway of supporting SMB on Linux is via the software Samba.</p><p><a href="https://en.wikipedia.org/wiki/Samba_(software)">Samba</a>, and otherways of serving Linux filesystems, via SMB should work fine withmergerfs. The services do not tend to use the same technologies whichNFS uses and therefore don't have the same issues. There should not bespecial settings required to use mergerfs with Samba. However,<a href="https://en.wikipedia.org/wiki/CIFSD">CIFSD</a> and other programs havenot been extensively tested. If you use mergerfs with CIFSD or otherSMB servers please submit your experiences so these docs can beupdated.</p><h2 id="sshfs">SSHFS</h2><p><a href="https://en.wikipedia.org/wiki/SSHFS">SSHFS</a> is a FUSE filesystemleveraging SSH as the connection and transport layer. While oftensimpler to setup when compared to NFS or Samba the performance can belacking and the project is very much in maintenance mode.</p><p>There are no known issues using sshfs with mergerfs. You may want touse the following arguments to improve performance but your millagemay vary.</p><ul><li><code>-o Ciphers=arcfour</code></li><li><code>-o Compression=no</code></li></ul><p>More info can be found<a href="https://ideatrash.net/2016/08/odds-and-ends-optimizing-sshfs-moving.html">here</a>.</p><h2 id="other">Other</h2><p>There are other remote filesystems but none popularly used to servemergerfs. If you use something not listed above feel free to reach outand I will add it to the list.</p>
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