{"id":10535,"date":"2017-10-05T11:28:44","date_gmt":"2017-10-05T09:28:44","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/"},"modified":"2017-10-05T11:28:44","modified_gmt":"2017-10-05T09:28:44","slug":"udev-rules-for-asm-devices-on-rhel-7","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/","title":{"rendered":"udev rules for ASM devices on RHEL 7"},"content":{"rendered":"<p>Preparing the storage devices for use with ASM is one of the first tasks you should do. When you do not want to use <a href=\"http:\/\/www.oracle.com\/technetwork\/topics\/linux\/asmlib\/index-101839.html\" target=\"_blank\" rel=\"noopener\">ASMLib<\/a> then <a href=\"https:\/\/en.wikipedia.org\/wiki\/Udev\" target=\"_blank\" rel=\"noopener\">udev<\/a> is what you should use for this. As the order\/naming of the devices in the device tree <a href=\"https:\/\/access.redhat.com\/documentation\/en-us\/red_hat_enterprise_linux\/7\/html\/storage_administration_guide\/persistent_naming\" target=\"_blank\" rel=\"noopener\">is not guaranteed<\/a> (e.g. dm-1 is not guaranteed to be the same device after a reboot of the system) you need a way to fix this and that is what udev can be used for.<\/p>\n<p><!--more--><\/p>\n<p>The first step is to get the UUIDs of all the devices you want to use with ASM (dm-1 to dm-3, in this case). This assumes that <a href=\"https:\/\/en.wikipedia.org\/wiki\/Linux_DM_Multipath\" target=\"_blank\" rel=\"noopener\">multi pathing<\/a> is already setup:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\n[root@xxx ~]$ udevadm info --query=all --name=\/dev\/dm-1 | grep -i DM_UUID\nE: DM_UUID=mpath-3600a098000a819ff0000018559bf68d7\n[root@xxx ~]$ udevadm info --query=all --name=\/dev\/dm-2 | grep -i DM_UUID\nE: DM_UUID=mpath-3600a098000a81955000001b359bf6920\n[root@xxx ~]$ udevadm info --query=all --name=\/dev\/dm-3 | grep -i DM_UUID\nE: DM_UUID=mpath-3600a098000a819ff0000018359bf68ce\n<\/pre>\n<p>Having this the udev rules should look like this (of course the name does not need to be same as below):<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\n[root@xxx ~]$ cat \/etc\/udev\/rules.d\/30-oracle.rules \nACTION==\"add|change\", ENV{DM_UUID}==\"mpath-3600a098000a81955000001b359bf6920\", NAME=\"asm-crs\",  OWNER=\"oracle\", GROUP=\"asmadmin\", MODE=\"0600\"\nACTION==\"add|change\", ENV{DM_UUID}==\"mpath-3600a098000a819ff0000018359bf68ce\", NAME=\"asm-fra\",  OWNER=\"oracle\", GROUP=\"asmadmin\", MODE=\"0600\"\nACTION==\"add|change\", ENV{DM_UUID}==\"mpath-3600a098000a819ff0000018559bf68d7\", NAME=\"asm-data\", OWNER=\"oracle\", GROUP=\"asmadmin\", MODE=\"0600\"\n<\/pre>\n<p>Once the system rebooted the permissions on the devices should be fine and naming persistent:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1; highlight: [5,6,7,19,21,22]\">\n[root@xxx ~]$ ls -al \/dev\/mapper\/\ntotal 0\ndrwxr-xr-x  2 root root     280 Oct  4 08:50 .\ndrwxr-xr-x 20 root root    4180 Oct  4 08:50 ..\nlrwxrwxrwx  1 root root       7 Oct  4 13:10 asm-crs -&gt; ..\/dm-2\nlrwxrwxrwx  1 root root       7 Oct  4 13:10 asm-data -&gt; ..\/dm-1\nlrwxrwxrwx  1 root root       7 Oct  4 13:10 asm-fra -&gt; ..\/dm-3\ncrw-------  1 root root 10, 236 Oct  4 08:50 control\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 disk00 -&gt; ..\/dm-4\nlrwxrwxrwx  1 root root       7 Oct  4 08:50 vg_root-lv_openafs -&gt; ..\/dm-8\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 vg_root-lv_root -&gt; ..\/dm-0\nlrwxrwxrwx  1 root root       8 Oct  4 12:51 vg_root-lv_swap -&gt; ..\/dm-10\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 vg_root-lv_tmp -&gt; ..\/dm-7\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 vg_root-lv_var -&gt; ..\/dm-6\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 vg_root-lv_var_log -&gt; ..\/dm-5\nlrwxrwxrwx  1 root root       7 Oct  4 12:51 vg_root-lv_var_log_audit -&gt; ..\/dm-9\n[root@xxx ~]$ ls -la \/dev\/dm*\nbrw-rw---- 1 root   disk     253,  0 Oct  4 12:51 \/dev\/dm-0\nbrw------- 1 oracle asmadmin 253,  1 Oct  4 13:11 \/dev\/dm-1\nbrw-rw---- 1 root   disk     253, 10 Oct  4 12:51 \/dev\/dm-10\nbrw------- 1 oracle asmadmin 253,  2 Oct  4 13:11 \/dev\/dm-2\nbrw------- 1 oracle asmadmin 253,  3 Oct  4 13:11 \/dev\/dm-3\nbrw-rw---- 1 root   disk     253,  4 Oct  4 12:51 \/dev\/dm-4\nbrw-rw---- 1 root   disk     253,  5 Oct  4 12:51 \/dev\/dm-5\nbrw-rw---- 1 root   disk     253,  6 Oct  4 12:51 \/dev\/dm-6\nbrw-rw---- 1 root   disk     253,  7 Oct  4 12:51 \/dev\/dm-7\nbrw-rw---- 1 root   disk     253,  8 Oct  4 08:50 \/dev\/dm-8\nbrw-rw---- 1 root   disk     253,  9 Oct  4 12:51 \/dev\/dm-9\n<\/pre>\n<p>Hope this helps.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Preparing the storage devices for use with ASM is one of the first tasks you should do. When you do not want to use ASMLib then udev is what you should use for this. As the order\/naming of the devices in the device tree is not guaranteed (e.g. dm-1 is not guaranteed to be the [&hellip;]<\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[37,73,1189],"type_dbi":[],"class_list":["post-10535","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-asm","tag-linux","tag-udev"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>udev rules for ASM devices on RHEL 7 - dbi Blog<\/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:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"udev rules for ASM devices on RHEL 7\" \/>\n<meta property=\"og:description\" content=\"Preparing the storage devices for use with ASM is one of the first tasks you should do. When you do not want to use ASMLib then udev is what you should use for this. As the order\/naming of the devices in the device tree is not guaranteed (e.g. dm-1 is not guaranteed to be the [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-10-05T09:28:44+00:00\" \/>\n<meta name=\"author\" content=\"Daniel Westermann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@westermanndanie\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Daniel Westermann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\"},\"author\":{\"name\":\"Daniel Westermann\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"headline\":\"udev rules for ASM devices on RHEL 7\",\"datePublished\":\"2017-10-05T09:28:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\"},\"wordCount\":159,\"commentCount\":0,\"keywords\":[\"ASM\",\"Linux\",\"udev\"],\"articleSection\":[\"Database Administration &amp; Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\",\"name\":\"udev rules for ASM devices on RHEL 7 - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\"},\"datePublished\":\"2017-10-05T09:28:44+00:00\",\"author\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.dbi-services.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"udev rules for ASM devices on RHEL 7\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/\",\"name\":\"dbi Blog\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\",\"name\":\"Daniel Westermann\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"caption\":\"Daniel Westermann\"},\"description\":\"Daniel Westermann is Principal Consultant and Technology Leader Open Infrastructure at dbi services. He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &amp;\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.\",\"sameAs\":[\"https:\/\/x.com\/westermanndanie\"],\"url\":\"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"udev rules for ASM devices on RHEL 7 - dbi Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/","og_locale":"en_US","og_type":"article","og_title":"udev rules for ASM devices on RHEL 7","og_description":"Preparing the storage devices for use with ASM is one of the first tasks you should do. When you do not want to use ASMLib then udev is what you should use for this. As the order\/naming of the devices in the device tree is not guaranteed (e.g. dm-1 is not guaranteed to be the [&hellip;]","og_url":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/","og_site_name":"dbi Blog","article_published_time":"2017-10-05T09:28:44+00:00","author":"Daniel Westermann","twitter_card":"summary_large_image","twitter_creator":"@westermanndanie","twitter_misc":{"Written by":"Daniel Westermann","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#article","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/"},"author":{"name":"Daniel Westermann","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66"},"headline":"udev rules for ASM devices on RHEL 7","datePublished":"2017-10-05T09:28:44+00:00","mainEntityOfPage":{"@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/"},"wordCount":159,"commentCount":0,"keywords":["ASM","Linux","udev"],"articleSection":["Database Administration &amp; Monitoring"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/","url":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/","name":"udev rules for ASM devices on RHEL 7 - dbi Blog","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/#website"},"datePublished":"2017-10-05T09:28:44+00:00","author":{"@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66"},"breadcrumb":{"@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.dbi-services.com\/blog\/udev-rules-for-asm-devices-on-rhel-7\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.dbi-services.com\/blog\/"},{"@type":"ListItem","position":2,"name":"udev rules for ASM devices on RHEL 7"}]},{"@type":"WebSite","@id":"https:\/\/www.dbi-services.com\/blog\/#website","url":"https:\/\/www.dbi-services.com\/blog\/","name":"dbi Blog","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66","name":"Daniel Westermann","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g","caption":"Daniel Westermann"},"description":"Daniel Westermann is Principal Consultant and Technology Leader Open Infrastructure at dbi services. He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &amp;\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.","sameAs":["https:\/\/x.com\/westermanndanie"],"url":"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/"}]}},"_links":{"self":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/10535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/comments?post=10535"}],"version-history":[{"count":0,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/10535\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=10535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=10535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=10535"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=10535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}