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|       I modified mergerfs' config but it still behaves the same. | |
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|       Why do I get an "out of space" / "no space left on device" / ENOSPC error even though there appears to be lots of space available? | |
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| <h1 id="why-isnt-it-working">"Why isn't it working?"</h1> | |
| <h2 id="i-modified-mergerfs-config-but-it-still-behaves-the-same">I modified mergerfs' config but it still behaves the same.</h2> | |
| <p>mergerfs, like other filesystems, are given their options/arguments at | |
| mount time. You can not simply modify the <a href="../../quickstart/#usage">source of the | |
| configuration</a> and have those settings applied | |
| any more than you would for other filesystems. It is the user's | |
| responsibility to <a href="../../setup/upgrade/">restart</a> mergerfs to pick up | |
| the changes or use the <a href="../../runtime_interfaces/">runtime interface</a>.</p> | |
| <p>NOTE: the <a href="../../runtime_interfaces/">runtime interface</a> is <strong>just</strong> | |
| for runtime changes. It does <strong>NOT</strong> save those changed values | |
| anywhere.</p> | |
| <h2 id="why-are-all-my-files-ending-up-on-1-filesystem">Why are all my files ending up on 1 filesystem?!</h2> | |
| <p>Did you start with empty filesystems? Are you using an <code>existing path</code> | |
| policy such as <code>epmfs</code>?</p> | |
| <p>If starting with a set of empty filesystems such a policy will select | |
| only 1 filesystem when the first directory is created. Anything | |
| created in that directory will be placed on the same branch because | |
| that is the point of such a policy. That is the expected behavior.</p> | |
| <p>This may catch users off guard but the point of those <code>existing path</code> | |
| policies is to preserve the directory layout and you need to consider | |
| what that means one event at a time.</p> | |
| <p>To "fix" this situation change the policy. Most users <a href="../configuration_and_policies/#how-can-i-ensure-files-are-collocated-on-the-same-branch">have little | |
| reason</a> | |
| to use such a policy. See the <a href="../../quickstart/">quick start guide</a> | |
| and <a href="../configuration_and_policies/">FAQ</a> for policy recommendations.</p> | |
| <h2 id="why-do-i-get-an-out-of-space-no-space-left-on-device-enospc-error-even-though-there-appears-to-be-lots-of-space-available">Why do I get an "out of space" / "no space left on device" / ENOSPC error even though there appears to be lots of space available?</h2> | |
| <p>First make sure you've read the sections about <a href="../../config/functions_categories_policies/">policies, path | |
| preservation, branch | |
| filtering,</a> and the | |
| options <a href="../../config/minfreespace/">minfreespace</a>, | |
| <a href="../../config/moveonenospc/">moveonenospc</a>, | |
| <a href="../../config/statfs/">statfs</a>, and | |
| <a href="../../config/statfs/#statfs_ignore">statfs_ignore</a>.</p> | |
| <p>mergerfs is simply presenting a union of the content within multiple | |
| branches. The reported free space is an aggregate of space available | |
| within the pool (behavior modified by <code>statfs</code> and | |
| <code>statfs_ignore</code>). It does not represent a contiguous space. In the | |
| same way that read-only filesystems, those with quotas, or reserved | |
| space report the full theoretical space available. Not the practical | |
| usable space.</p> | |
| <p>Due to using an <code>existing path</code> based policy, setting a <a href="../../config/branches/#branch-mode">branch's | |
| mode</a> to <code>NC</code> or <code>RO</code>, a | |
| filesystems read-only status, and/or <code>minfreespace</code> setting it is | |
| <a href="../../config/functions_categories_policies/#filtering">perfectly | |
| valid</a> that | |
| <code>ENOSPC</code> / "out of space" / "no space left on device" be returned when | |
| attempting to create a file despite there being actual space available | |
| somewhere in the pool. It is doing what was asked of it: filtering | |
| possible branches due to those settings. If that is not the behavior | |
| you want you need to modify the settings accordingly.</p> | |
| <p>It is also possible that the filesystem selected has run out of | |
| inodes. Use <code>df -i</code> to list the total and available inodes per | |
| filesystem.</p> | |
| <h2 id="why-isnt-the-create-policy-working">Why isn't the create policy working?</h2> | |
| <p>It probably is. The policies rather straight forward and well tested.</p> | |
| <p>First, confirm the policy is configured as expected by using the | |
| <a href="../../runtime_interfaces/">runtime interface</a>.</p> | |
| <div class="language-shell highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>$<span class="w"> </span>getfattr<span class="w"> </span>-n<span class="w"> </span>user.mergerfs.category.create<span class="w"> </span>/mnt/mergerfs/.mergerfs | |
| </span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1"># file: mnt/mergerfs/.mergerfs</span> | |
| </span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>user.mergerfs.category.create<span class="o">=</span><span class="s2">"mfs"</span> | |
| </span></code></pre></div> | |
| <p>Second, as discussed in the <a href="../../support/">support</a> section, test the | |
| behavior using simple command line tools such as <code>touch</code> and then see | |
| where it was created.</p> | |
| <div class="language-shell highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>$<span class="w"> </span>touch<span class="w"> </span>/mnt/mergerfs/new-file | |
| </span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>$<span class="w"> </span>getfattr<span class="w"> </span>-n<span class="w"> </span>user.mergerfs.allpaths<span class="w"> </span>/mnt/mergerfs/new-file | |
| </span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="c1"># file: mnt/mergerfs/new-file</span> | |
| </span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>user.mergerfs.allpaths<span class="o">=</span><span class="s2">"/mnt/hdd/drive1/new-file"</span> | |
| </span></code></pre></div> | |
| <p>If the location of the file is where it should be according to the | |
| state of the system at the time and the policy selected then the | |
| "problem" lies elsewhere.</p> | |
| <p><a href="../technical_behavior_and_limitations/#how-does-mergerfs-handle-moving-and-copying-of-files">Keep in | |
| mind</a> | |
| that files, when created, have no size. If a number of files are | |
| created at the same time, for example by a program downloading | |
| numerous files like a BitTorrent client, then depending on the policy | |
| the files could be created on the same branch. As the files are | |
| written to, or resized immediately afterwards to the total size of the | |
| file being downloaded, the files will take up more space but there is | |
| no mechanism to move them as they grow. Nor would it be a good idea to | |
| do so as it would be expensive to continuously calculate their size | |
| and perform the move while the file is still being written to. As such | |
| an imbalance will occur that wouldn't if the files had been created | |
| and resized one at a time.</p> | |
| <p>If you wish to reduce the likelihood of this happening a policy that | |
| does not make decisions on available space alone such as <code>pfrd</code> or | |
| <code>rand</code> should be used.</p> | |
| <h2 id="why-cant-i-see-my-files-directories">Why can't I see my files / directories?</h2> | |
| <p>It's almost always a permissions issue. Unlike mhddfs and | |
| unionfs-fuse, which accesses content as root, mergerfs always changes | |
| its credentials to that of the caller. This is done as it is the only | |
| properly secure way to manage permissions. This means that if the user | |
| does not have access to a file or directory than neither will | |
| mergerfs. However, because mergerfs is creating a union of paths it | |
| may be able to read some files and directories on one filesystem but | |
| not another resulting in an incomplete set. And if one of the branches | |
| it can access is empty then it will return an empty list.</p> | |
| <p>Try using <a href="https://github.com/trapexit/mergerfs-tools">mergerfs.fsck</a> | |
| tool to check for and fix inconsistencies in permissions. If you | |
| aren't seeing anything at all be sure that the basic permissions are | |
| correct. The user and group values are correct and that directories | |
| have their executable bit set. A common mistake by users new to Linux | |
| is to <code>chmod -R 644</code> when they should have <code>chmod -R u=rwX,go=rX</code>.</p> | |
| <p>If using a <a href="../../remote_filesystems/">network filesystem</a> such as NFS | |
| or SMB (Samba) be sure to pay close attention to anything regarding | |
| permissioning and users. Root squashing and user translation for | |
| instance has bitten a few mergerfs users. Some of these also affect | |
| the use of mergerfs from <a href="../compatibility_and_integration/">container platforms such as | |
| Docker.</a></p> | |
| <h2 id="why-are-file-moves-renames-linkshardlinks-failing">Why are file moves, renames, links/hardlinks failing?</h2> | |
| <p>mergerfs fully supports rename and link functions to the degree that | |
| is possible in a union filesystem. Problems related to rename and link | |
| are almost exclusively due to incorrect setup of software or poorly | |
| written software.</p> | |
| <h3 id="docker-podman-and-other-container-runtimes">Docker, Podman, and other container runtimes</h3> | |
| <p>Keep in mind that <a href="../../config/rename_and_link/">rename and link</a> will | |
| <strong>NOT</strong> work across devices. That includes between the original | |
| filesystem and a mergerfs pool, between two separate pools of the same | |
| underlying filesystems, or bind mounts of paths within the mergerfs | |
| pool. The latter is common when using Docker, Podman, or other | |
| container runtimes. Multiple volumes (bind mounts) to the same | |
| underlying filesystem are considered different devices. There is no | |
| way to link or rename between them despite them binding to the same | |
| underlying filesystem. Neither mergerfs or any other filesystem has a | |
| say in this behavior as the kernel is erroring out before the request | |
| even gets to the filesystems in question.</p> | |
| <p>To work around this situation the highest directory in the mergerfs | |
| pool that includes all the paths you need is what should be bind'ed | |
| into the container if you want links and rename to work between the | |
| paths in question.</p> | |
| <p>This is a common problem for users of Radarr, Sonarr, Lidarr, | |
| etc. when they use the default volume mount options suggested by | |
| projects like | |
| <a href="https://docs.linuxserver.io/images/docker-radarr/?h=radarr#docker-compose-recommended-click-here-for-more-info">LinuxServer.io</a>. Do | |
| not use separate "movies" and "downloads" volumes.</p> | |
| <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># NO | |
| </span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>volumes: | |
| </span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>  - /mnt/pool/movies:/movies | |
| </span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>  - /mnt/pool/downloads:/downloads | |
| </span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> | |
| </span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a># YES | |
| </span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>volumes: | |
| </span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a>  - /mnt/pool:/media | |
| </span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a># Then use /media/movies and /media/downloads in your software. | |
| </span></code></pre></div> | |
| <h3 id="path-preserving-create-policies">Path-Preserving Create Policies</h3> | |
| <p>As described in the <a href="../../config/rename_and_link/">rename and link</a> | |
| docs if a path-preserving create | |
| <a href="../../config/functions_categories_policies/">policy</a> is configured | |
| then mergerfs, in order to follow that restrictive policy, must return | |
| an error | |
| (<a href="https://man7.org/linux/man-pages/man2/rename.2.html">EXDEV</a>) if the | |
| target path of a rename or link is not found on the target branch.</p> | |
| <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>EXDEV  oldpath and newpath are not on the same mounted filesystem. | |
| </span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>       (Linux permits a filesystem to be mounted at multiple | |
| </span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>       points, but rename() does not work across different mount | |
| </span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>       points, even if the same filesystem is mounted on both.) | |
| </span></code></pre></div> | |
| <p><a href="../configuration_and_policies/#how-can-i-ensure-files-are-collocated-on-the-same-branch">Most | |
| users</a> | |
| do not have a need for path-preserving policies but if you intend on | |
| using path-preserving policies you must accept that <code>EXDEV</code> errors are | |
| more likely to occur. You could enable | |
| <a href="../../config/options/">ignorepponrename</a> however doing so would | |
| contradict the intention of using a path restrictive policy.</p> | |
| <h3 id="poorly-written-software">Poorly written software</h3> | |
| <p>There are some pieces of software that do not properly handle <code>EXDEV</code> | |
| errors which <code>rename</code> and <code>link</code> may return even though they are | |
| perfectly valid situations and do not indicate actual device, | |
| filesystem, or OS problems. The error will rarely be returned by | |
| mergerfs if using a non-path preserving | |
| <a href="../../config/functions_categories_policies/">policy</a> however there are | |
| edge cases where it may (such as mounting another filesystem into the | |
| mergerfs pool.) If you do not care about path preservation set the | |
| mergerfs policy to the non-path preserving variant. For example: <code>-o | |
| category.create=pfrd</code>. Ideally the offending software would be fixed | |
| and it is recommended that if you run into this problem you contact | |
| the software's author and request proper handling of <code>EXDEV</code> errors.</p> | |
| <h3 id="additional-reading">Additional Reading</h3> | |
| <ul> | |
| <li><a href="../../config/rename_and_link/">rename and link</a></li> | |
| <li><a href="../technical_behavior_and_limitations/#do-hardlinks-work">Do hardlinks work?</a></li> | |
| <li><a href="../technical_behavior_and_limitations/#how-does-mergerfs-handle-moving-and-copying-of-files">How does mergerfs handle moving and copying of files?</a></li> | |
| <li><a href="../../known_issues_bugs/#moving-files-and-directories-fails-with-samba">Moving files and directories fails with Samba</a></li> | |
| </ul> | |
| <h2 id="why-is-rtorrent-failing-with-enodev-no-such-device">Why is rtorrent failing with ENODEV (No such device)?</h2> | |
| <p>Be sure to set | |
| <a href="../../config/cache/">cache.files=partial|full|auto-full|per-process</a> | |
| or use Linux kernel v6.6 or above. rtorrent and some other | |
| applications use <a href="http://linux.die.net/man/2/mmap">mmap</a> to read and | |
| write to files and offer no fallback to traditional methods.</p> | |
| <h2 id="why-dont-i-see-mergerfs-options-in-mount-command-or-procmounts">Why don't I see mergerfs options in mount command or /proc/mounts?</h2> | |
| <p>FUSE filesystems, such as mergerfs, are interpreting most of the | |
| possible options rather than being given to the kernel where those | |
| options in the <code>mount</code> command and /proc/mounts come from.</p> | |
| <p>If you want to see the options of a running instance of mergerfs you | |
| can use the <a href="../../runtime_interfaces/">runtime interface</a>.</p> | |
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