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header_5_font_size__hover_enabled=&#8221;16px&#8221; header_5_letter_spacing__hover=&#8221;0px&#8221; header_5_letter_spacing__hover_enabled=&#8221;0px&#8221; header_5_line_height__hover=&#8221;1em&#8221; header_5_line_height__hover_enabled=&#8221;1em&#8221; header_5_text_shadow_style__hover=&#8221;none&#8221; header_5_text_shadow_style__hover_enabled=&#8221;none&#8221; header_5_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; header_5_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221; header_6_font_size__hover=&#8221;14px&#8221; header_6_font_size__hover_enabled=&#8221;14px&#8221; header_6_letter_spacing__hover=&#8221;0px&#8221; header_6_letter_spacing__hover_enabled=&#8221;0px&#8221; header_6_line_height__hover=&#8221;1em&#8221; header_6_line_height__hover_enabled=&#8221;1em&#8221; header_6_text_shadow_style__hover=&#8221;none&#8221; header_6_text_shadow_style__hover_enabled=&#8221;none&#8221; header_6_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; header_6_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221; text_letter_spacing__hover=&#8221;0px&#8221; text_letter_spacing__hover_enabled=&#8221;0px&#8221; text_text_shadow_style__hover=&#8221;none&#8221; text_text_shadow_style__hover_enabled=&#8221;none&#8221; text_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; text_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221;]<\/p>\n<h1 data-path-to-node=\"3\">Optimizing ZFS Recordsize: The &#8220;Hidden&#8221; Variable for Massive Performance Gains<\/h1>\n<p data-path-to-node=\"4\">If you\u2019ve been diving into the world of ZFS, you\u2019ve probably spent hours debating RAIDZ levels, L2ARC sizes, and RAM overhead. But there is one setting that often flies under the radar, yet has more impact on your daily IOPS than almost any other: <b data-path-to-node=\"4\" data-index-in-node=\"248\">The Recordsize.<\/b><\/p>\n<p data-path-to-node=\"5\">Whether you are running a Proxmox cluster, a Plex media server, or a high-performance database, setting the wrong recordsize is like driving a Ferrari in first gear.<\/p>\n<p data-path-to-node=\"6\">Let\u2019s break down how to master this setting and, more importantly, how to verify the results using tools like <b data-path-to-node=\"6\" data-index-in-node=\"110\">FIO<\/b>.<\/p>\n<h2 data-path-to-node=\"7\">What exactly is ZFS Recordsize?<\/h2>\n<p data-path-to-node=\"8\">Think of the <code data-path-to-node=\"8\" data-index-in-node=\"13\">recordsize<\/code> as the maximum size of the data blocks ZFS writes to your pool. By default, ZFS uses <b data-path-to-node=\"8\" data-index-in-node=\"109\">128K<\/b>.<\/p>\n<p data-path-to-node=\"9\">ZFS is a variable-block-size file system. If you write a 4K file, it will only use 4K on disk. However, if you write a 1MB file, ZFS will chop it into 128K chunks (by default).<\/p>\n<h3 data-path-to-node=\"10\">Why does this matter?<\/h3>\n<ul data-path-to-node=\"11\">\n<li>\n<p data-path-to-node=\"11,0,0\"><b data-path-to-node=\"11,0,0\" data-index-in-node=\"0\">Small recordsize (e.g., 4K or 16K):<\/b> Great for databases (MySQL, PostgreSQL) because it matches how they talk to the disk. It prevents &#8220;Write Amplification.&#8221;<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,1,0\"><b data-path-to-node=\"11,1,0\" data-index-in-node=\"0\">Large recordsize (e.g., 1M):<\/b> Incredible for media files or backups. It increases throughput and improves compression ratios.<\/p>\n<\/li>\n<\/ul>\n<hr data-path-to-node=\"12\" \/>\n<h2 data-path-to-node=\"13\">The Proxmox &amp; VM Trap<\/h2>\n<p data-path-to-node=\"14\">If you are running Virtual Machines on ZFS (common in Proxmox or TrueNAS), you might be suffering from a massive performance penalty without knowing it.<\/p>\n<p data-path-to-node=\"15\">Most VM disk images (zvols) use an <b data-path-to-node=\"15\" data-index-in-node=\"35\">8K block size<\/b> by default. If your underlying ZFS pool is optimized for 128K, every time your VM wants to change a tiny 8K piece of data, ZFS might end up doing more work than necessary. This leads to high latency and &#8220;iowait.&#8221;<\/p>\n<p data-path-to-node=\"16\"><b data-path-to-node=\"16\" data-index-in-node=\"0\">The Golden Rule for VMs:<\/b> Match your ZFS <code data-path-to-node=\"16\" data-index-in-node=\"40\">volblocksize<\/code> to your VM&#8217;s internal file system cluster size. For most Linux VMs, <b data-path-to-node=\"16\" data-index-in-node=\"121\">16K or 64K<\/b> is often the &#8220;sweet spot&#8221; balance between performance and storage efficiency.<\/p>\n<hr data-path-to-node=\"17\" \/>\n<h2 data-path-to-node=\"18\">How to Test Your Performance (The Scientific Way)<\/h2>\n<p data-path-to-node=\"19\">Don&#8217;t guess\u2014benchmark. To see if your recordsize is working for you, you need to simulate real-world workloads using <b data-path-to-node=\"19\" data-index-in-node=\"117\">FIO (Flexible I\/O Tester)<\/b>.<\/p>\n<p data-path-to-node=\"20\">Here is a command to test <b data-path-to-node=\"20\" data-index-in-node=\"26\">Random Write<\/b> performance, which is where a wrong recordsize hurts the most:<\/p>\n<p><response-element class=\"\" ng-version=\"0.0.0-PLACEHOLDER\"><code-block _nghost-ng-c2579369677=\"\" class=\"ng-tns-c2579369677-290 ng-star-inserted\"><\/code-block><\/response-element><\/p>\n<div _ngcontent-ng-c2579369677=\"\" class=\"code-block ng-tns-c2579369677-290 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" jslog=\"223238;track:impression,attention;BardVeMetadataKey:[[&quot;r_33437d0b622e71f6&quot;,&quot;c_712fc19e2862d3fd&quot;,null,&quot;rc_6d5258b32debc917&quot;,null,null,&quot;en&quot;,null,1,null,null,1,0]]\" data-hveid=\"0\" decode-data-ved=\"1\" data-ved=\"0CAAQhtANahgKEwjhkoTF_e-SAxUAAAAAHQAAAAAQ9AM\">\n<div _ngcontent-ng-c2579369677=\"\" class=\"code-block-decoration header-formatted gds-title-s ng-tns-c2579369677-290 ng-star-inserted\">\n<p><span _ngcontent-ng-c2579369677=\"\" class=\"ng-tns-c2579369677-290\">Bash<\/span><\/p>\n<div _ngcontent-ng-c2579369677=\"\" class=\"buttons ng-tns-c2579369677-290 ng-star-inserted\"><button _ngcontent-ng-c2579369677=\"\" aria-label=\"Copiar c\u00f3digo\" mat-icon-button=\"\" mattooltip=\"Copiar c\u00f3digo\" class=\"mdc-icon-button mat-mdc-icon-button mat-mdc-button-base mat-mdc-tooltip-trigger copy-button ng-tns-c2579369677-290 mat-unthemed ng-star-inserted\" mat-ripple-loader-uninitialized=\"\" mat-ripple-loader-class-name=\"mat-mdc-button-ripple\" mat-ripple-loader-centered=\"\" jslog=\"179062;track:generic_click,impression;BardVeMetadataKey:[[&quot;r_33437d0b622e71f6&quot;,&quot;c_712fc19e2862d3fd&quot;,null,&quot;rc_6d5258b32debc917&quot;,null,null,&quot;en&quot;,null,1,null,null,1,0]];mutable:true\"><span class=\"mat-mdc-button-persistent-ripple mdc-icon-button__ripple\"><\/span><mat-icon _ngcontent-ng-c2579369677=\"\" role=\"img\" fonticon=\"content_copy\" class=\"mat-icon notranslate gds-icon-s google-symbols mat-ligature-font mat-icon-no-color\" aria-hidden=\"true\" data-mat-icon-type=\"font\" data-mat-icon-name=\"content_copy\"><\/mat-icon><span class=\"mat-focus-indicator\"><\/span><span class=\"mat-mdc-button-touch-target\"><\/span><\/button><\/div>\n<\/div>\n<div _ngcontent-ng-c2579369677=\"\" class=\"formatted-code-block-internal-container ng-tns-c2579369677-290\">\n<div _ngcontent-ng-c2579369677=\"\" class=\"animated-opacity ng-tns-c2579369677-290\">\n<pre _ngcontent-ng-c2579369677=\"\" class=\"ng-tns-c2579369677-290\"><code _ngcontent-ng-c2579369677=\"\" role=\"text\" data-test-id=\"code-content\" class=\"code-container formatted ng-tns-c2579369677-290\">fio --name=random-write --ioengine=libaio --rw=randwrite --bs=4k --size=2G --numjobs=1 --iodepth=64 --runtime=60 --time_based --output-format=json --filename=\/your\/zfs\/path\/testfile\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h3 data-path-to-node=\"22\">Analyzing the Results<\/h3>\n<p data-path-to-node=\"23\">Once you run this, you&#8217;ll get a complex JSON output. This is where most people get lost.<\/p>\n<p data-path-to-node=\"24\"><b data-path-to-node=\"24\" data-index-in-node=\"0\">Pro Tip:<\/b> Look at your <b data-path-to-node=\"24\" data-index-in-node=\"22\">p99 latency<\/b>. If your recordsize is poorly optimized, you&#8217;ll see massive spikes here. You can take this JSON output and paste it into our <response-element class=\"\" ng-version=\"0.0.0-PLACEHOLDER\"><link-block _nghost-ng-c3052017089=\"\" class=\"ng-star-inserted\"><a _ngcontent-ng-c3052017089=\"\" target=\"_blank\" rel=\"noopener\" externallink=\"\" _nghost-ng-c3025416748=\"\" jslog=\"197247;track:generic_click,impression,attention;BardVeMetadataKey:[[&quot;r_33437d0b622e71f6&quot;,&quot;c_712fc19e2862d3fd&quot;,null,&quot;rc_6d5258b32debc917&quot;,null,null,&quot;en&quot;,null,1,null,null,1,0]]\" href=\"https:\/\/raidzfscalculator.com\/en\/fio-results-viewer\/\" class=\"ng-star-inserted\" data-hveid=\"0\" decode-data-ved=\"1\" data-ved=\"0CAAQ_4QMahgKEwjhkoTF_e-SAxUAAAAAHQAAAAAQ9QM\">FIO Results Viewer<\/a><\/link-block><\/response-element> to see a clean breakdown of your IOPS and Latency percentiles.<\/p>\n<hr data-path-to-node=\"25\" \/>\n<h2 data-path-to-node=\"26\">The Verdict: Which size should you choose?<\/h2>\n<ol start=\"1\" data-path-to-node=\"27\">\n<li>\n<p data-path-to-node=\"27,0,0\"><b data-path-to-node=\"27,0,0\" data-index-in-node=\"0\">Bit Torrent &amp; Large Media:<\/b> Go for <b data-path-to-node=\"27,0,0\" data-index-in-node=\"34\">1M<\/b>. It reduces metadata overhead and makes your scrubs much faster.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"27,1,0\"><b data-path-to-node=\"27,1,0\" data-index-in-node=\"0\">General File Sharing:<\/b> Stick with the default <b data-path-to-node=\"27,1,0\" data-index-in-node=\"45\">128K<\/b>.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"27,2,0\"><b data-path-to-node=\"27,2,0\" data-index-in-node=\"0\">Databases (MySQL\/Postgres):<\/b> Match the page size (usually <b data-path-to-node=\"27,2,0\" data-index-in-node=\"57\">16K<\/b>).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"27,3,0\"><b data-path-to-node=\"27,3,0\" data-index-in-node=\"0\">Virtualization (Proxmox\/KVM):<\/b> Use <b data-path-to-node=\"27,3,0\" data-index-in-node=\"34\">16K or 64K<\/b> for your zvols.<\/p>\n<\/li>\n<\/ol>\n<h2 data-path-to-node=\"28\">Conclusion<\/h2>\n<p data-path-to-node=\"29\">ZFS isn&#8217;t &#8220;set and forget.&#8221; It\u2019s a precision instrument. By taking 10 minutes to adjust your recordsize to match your data type, you can often see a 2x to 5x improvement in responsiveness.<\/p>\n<p data-path-to-node=\"30\"><b data-path-to-node=\"30\" data-index-in-node=\"0\">What about you?<\/b> Have you benchmarked your pool lately? Run an FIO test today, and if the numbers look weird, it might be time to tweak that recordsize!<\/p>\n<p>[\/et_pb_text][et_pb_text quote_border_weight=&#8221;14px&#8221; quote_border_color=&#8221;#00ac69&#8243; _builder_version=&#8221;4.27.5&#8243; link_font=&#8221;||||||||&#8221; quote_font=&#8221;Work Sans|700|||||||&#8221; quote_text_color=&#8221;#000000&#8243; quote_font_size=&#8221;18px&#8221; quote_line_height=&#8221;1.8em&#8221; header_font=&#8221;||||||||&#8221; header_2_font=&#8221;Work Sans|700|||||||&#8221; header_2_font_size=&#8221;25px&#8221; header_2_line_height=&#8221;1.5em&#8221; max_width=&#8221;700px&#8221; max_width_tablet=&#8221;&#8221; max_width_phone=&#8221;&#8221; max_width_last_edited=&#8221;on|tablet&#8221; header_2_font_size_tablet=&#8221;30px&#8221; header_2_font_size_phone=&#8221;15px&#8221; header_2_font_size_last_edited=&#8221;on|desktop&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; header_font_size__hover=&#8221;30px&#8221; header_font_size__hover_enabled=&#8221;30px&#8221; 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text_letter_spacing__hover=&#8221;0px&#8221; text_letter_spacing__hover_enabled=&#8221;0px&#8221; text_text_shadow_style__hover=&#8221;none&#8221; text_text_shadow_style__hover_enabled=&#8221;none&#8221; text_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; text_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221;]<\/p>\n<table data-path-to-node=\"5\">\n<thead>\n<tr>\n<td><strong>Workload<\/strong><\/td>\n<td>\n<p><strong>Recommended <\/strong><\/p>\n<p><strong>Recordsize<\/strong><\/p>\n<\/td>\n<td><strong>Why?<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"5,1,0,0\"><b data-path-to-node=\"5,1,0,0\" data-index-in-node=\"0\">Databases<\/b><\/span><\/td>\n<td><span data-path-to-node=\"5,1,1,0\">16K<\/span><\/td>\n<td><span data-path-to-node=\"5,1,2,0\">Matches page size, reduces overhead<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,2,0,0\"><b data-path-to-node=\"5,2,0,0\" data-index-in-node=\"0\">Virtual Machines<\/b><\/span><\/td>\n<td><span data-path-to-node=\"5,2,1,0\">32K &#8211; 64K<\/span><\/td>\n<td><span data-path-to-node=\"5,2,2,0\">Balance between IOPS and space<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,3,0,0\"><b data-path-to-node=\"5,3,0,0\" data-index-in-node=\"0\">General Files<\/b><\/span><\/td>\n<td><span data-path-to-node=\"5,3,1,0\">128K<\/span><\/td>\n<td><span data-path-to-node=\"5,3,2,0\">Best default for mixed usage<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"5,4,0,0\"><b data-path-to-node=\"5,4,0,0\" data-index-in-node=\"0\">Media \/ Backups<\/b><\/span><\/td>\n<td><span data-path-to-node=\"5,4,1,0\">1M<\/span><\/td>\n<td><span data-path-to-node=\"5,4,2,0\">Maximum throughput &amp; compression<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.5&#8243; text_font=&#8221;||||||||&#8221; text_line_height=&#8221;2em&#8221; header_font=&#8221;||||||||&#8221; header_2_font=&#8221;Work Sans|700|||||||&#8221; header_2_font_size=&#8221;25px&#8221; header_2_line_height=&#8221;1.5em&#8221; 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header_6_font_size__hover_enabled=&#8221;14px&#8221; header_6_letter_spacing__hover=&#8221;0px&#8221; header_6_letter_spacing__hover_enabled=&#8221;0px&#8221; header_6_line_height__hover=&#8221;1em&#8221; header_6_line_height__hover_enabled=&#8221;1em&#8221; header_6_text_shadow_style__hover=&#8221;none&#8221; header_6_text_shadow_style__hover_enabled=&#8221;none&#8221; header_6_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; header_6_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221; text_letter_spacing__hover=&#8221;0px&#8221; text_letter_spacing__hover_enabled=&#8221;0px&#8221; text_text_shadow_style__hover=&#8221;none&#8221; text_text_shadow_style__hover_enabled=&#8221;none&#8221; text_text_shadow_color__hover=&#8221;rgba(0,0,0,0.4)&#8221; text_text_shadow_color__hover_enabled=&#8221;rgba(0,0,0,0.4)&#8221;]<\/p>\n<h2 data-path-to-node=\"4\">Deep Dive: The Cost of Metadata and Ashift<\/h2>\n<p data-path-to-node=\"5\">If you want to go even deeper, you must consider the <b data-path-to-node=\"5\" data-index-in-node=\"53\">Ashift<\/b> value (block size of your physical disks). Most modern drives use 4K native sectors (<code data-path-to-node=\"5\" data-index-in-node=\"145\">ashift=12)<\/code>.<\/p>\n<p data-path-to-node=\"6\">If you set a <code data-path-to-node=\"6\" data-index-in-node=\"13\">recordsize<\/code> that is too small (like 4K) on a RAIDZ array, you might run into a massive <b data-path-to-node=\"6\" data-index-in-node=\"99\">space inefficiency<\/b> issue. Because ZFS needs to store parity for every record, a small recordsize on a wide RAIDZ pool can lead to a situation where parity takes up as much space as the data itself!<\/p>\n<p data-path-to-node=\"7\"><b data-path-to-node=\"7\" data-index-in-node=\"0\">Pro Tip for NVMe Users:<\/b> If you are using high-end NVMe drives, don&#8217;t be afraid to experiment with <code data-path-to-node=\"7\" data-index-in-node=\"98\">recordsize=16K<\/code> for your OS drives. 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Variable for Massive Performance Gains If you\u2019ve been diving into the world of ZFS, you\u2019ve probably spent hours debating RAIDZ levels, L2ARC sizes, and RAM overhead. But there is one setting that often flies under the radar, yet has more impact on your daily IOPS than almost [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1085770,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[17,18,16],"class_list":["post-1085762","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-explanations","tag-fio","tag-optimizations","tag-zfs"],"_links":{"self":[{"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/posts\/1085762","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/comments?post=1085762"}],"version-history":[{"count":12,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/posts\/1085762\/revisions"}],"predecessor-version":[{"id":1085799,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/posts\/1085762\/revisions\/1085799"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/media\/1085770"}],"wp:attachment":[{"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/media?parent=1085762"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/categories?post=1085762"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/raidzfscalculator.com\/en\/wp-json\/wp\/v2\/tags?post=1085762"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}