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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="#is-mergerfs-production-ready" class="md-nav__link"> <span class="md-ellipsis"> Is mergerfs "production ready?" </span> </a> </li> <li class="md-nav__item"> <a href="#how-well-does-mergerfs-scale" class="md-nav__link"> <span class="md-ellipsis"> How well does mergerfs scale? </span> </a> </li> <li class="md-nav__item"> <a href="#are-there-any-limits" class="md-nav__link"> <span class="md-ellipsis"> Are there any limits? </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset">
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<h1 id="reliability-and-scalability">Reliability and Scalability</h1><h2 id="is-mergerfs-production-ready">Is mergerfs "production ready?"</h2><p>Yes.</p><p>mergerfs has been around for over a decade and used by many users ontheir systems. Typically running 24/7 with constant load.</p><p>At least a few companies are believed to use mergerfs in productionenvironments. A number of <a href="../../related_projects/">NAS focused operatingsystems</a> includes mergerfs as a solution forpooling filesystems.</p><p>Most serious issues (crashes or data corruption) have been due to<a href="../../known_issues_bugs/#fuse-and-linux-kernel">kernel bugs</a>. All ofwhich are fixed in stable releases.</p><h2 id="how-well-does-mergerfs-scale">How well does mergerfs scale?</h2><p>Users have reported running mergerfs on everything from OpenWRTrouters and Raspberry Pi SBCs to multi-socket Xeon enterprise servers.</p><p>Users have pooled everything from USB thumb drives to enterprise NVMESSDs to remote filesystems and rclone mounts.</p><p>The cost of many calls can be <code>O(n)</code> meaning adding more branches tothe pool will increase the cost of certain functions, such as readingdirectories or finding files to open, but there are a number of cachesand strategies in place to limit overhead where possible.</p><h2 id="are-there-any-limits">Are there any limits?</h2><p>There is no maximum capacity beyond what is imposed by the operatingsystem itself. Any limit is practical rather than technical. Asexplained in the question about scale mergerfs is mostly limited bythe tolerated cost of aggregating branches and the cost associatedwith interacting with them. If you pool slow network filesystem thenthat will naturally impact performance more than low latency SSDs.</p>
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