{"id":1624,"date":"2023-01-24T02:49:10","date_gmt":"2023-01-23T21:19:10","guid":{"rendered":"https:\/\/trysiteprice.com\/blog\/?p=1624"},"modified":"2023-01-24T02:49:10","modified_gmt":"2023-01-23T21:19:10","slug":"how-to-set-up-zfs-arc-size-on-freebsd","status":"publish","type":"post","link":"https:\/\/trysiteprice.com\/blog\/how-to-set-up-zfs-arc-size-on-freebsd\/","title":{"rendered":"How to set up ZFS ARC size on FreeBSD"},"content":{"rendered":"<p>The Adaptive Replacement Cache (ARC) is a component of the ZFS file system that stores frequently accessed data in memory to improve performance. On FreeBSD, the ARC size can be set using the &#8220;kern.vm.zfs.arc_max&#8221; sysctl.<\/p>\n<p>You can check the current ARC size by running the following command:<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">sysctl kern.vm.zfs.arc_max<br \/>\n<\/code><\/div>\n<\/div>\n<p>You can set the ARC size to a specific value by running the following command:<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">sysctl kern.vm.zfs.arc_max=value<br \/>\n<\/code><\/div>\n<\/div>\n<p>Where &#8220;value&#8221; is the size of the ARC in bytes. For example, to set the ARC size to 4GB:<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">sysctl kern.vm.zfs.arc_max=4294967296<br \/>\n<\/code><\/div>\n<\/div>\n<p>You can also set the value in human readable format using k as kilobytes, M as megabytes, G as Gigabytes etc. For example to set it to 4GB:<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">sysctl kern.vm.zfs.arc_max=4G<br \/>\n<\/code><\/div>\n<\/div>\n<p>It is important to note that the ARC size should be set based on the amount of memory available on the system and the workloads running on it. A larger ARC size may improve performance, but it also may cause the system to use more memory, potentially leading to memory pressure.<\/p>\n<p>It is also a good idea to set arc_meta_limit, which is the limit for metadata cache. It can also be set in a similar way as arc_max.<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">sysctl kern.vm.zfs.arc_meta_limit=value<br \/>\n<\/code><\/div>\n<\/div>\n<p>You can also add these settings to \/etc\/sysctl.conf so that they are automatically set at boot time.<\/p>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre-wrap hljs\">kern.vm.zfs.arc_max=4G<br \/>\nkern.vm.zfs.arc_meta_limit=1G<br \/>\n<\/code><\/div>\n<\/div>\n<p>Keep in mind that ZFS ARC size should be adjusted based on the workload, so it is always good to monitor the memory usage and adjust the settings accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Adaptive Replacement Cache (ARC) is a component of the ZFS file system that stores frequently accessed data in memory to improve performance. On FreeBSD, the ARC size can be set using the &#8220;kern.vm.zfs.arc_max&#8221; sysctl. You can check the current ARC size by running the following command: sysctl kern.vm.zfs.arc_max You can set the ARC size &#8230; <a title=\"How to set up ZFS ARC size on FreeBSD\" class=\"read-more\" href=\"https:\/\/trysiteprice.com\/blog\/how-to-set-up-zfs-arc-size-on-freebsd\/\" aria-label=\"Read more about How to set up ZFS ARC size on FreeBSD\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1624","post","type-post","status-publish","format-standard","hentry","category-best-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to set up ZFS ARC size on FreeBSD - TrySitePrice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/trysiteprice.com\/blog\/how-to-set-up-zfs-arc-size-on-freebsd\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to set up ZFS ARC size on FreeBSD - TrySitePrice\" \/>\n<meta property=\"og:description\" content=\"The Adaptive Replacement Cache (ARC) is a component of the ZFS file system that stores frequently accessed data in memory to improve performance. On FreeBSD, the ARC size can be set using the &#8220;kern.vm.zfs.arc_max&#8221; sysctl. You can check the current ARC size by running the following command: sysctl kern.vm.zfs.arc_max You can set the ARC size ... 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