{"id":390,"date":"2022-09-12T08:57:23","date_gmt":"2022-09-12T07:57:23","guid":{"rendered":"http:\/\/www.bocciolesi.fr\/tutoriels-et-cours\/?p=390"},"modified":"2025-01-09T13:53:33","modified_gmt":"2025-01-09T12:53:33","slug":"raid-logiciel-linux","status":"publish","type":"post","link":"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/raid-logiciel-linux\/","title":{"rendered":"Raid Logiciel Linux"},"content":{"rendered":"<div class=\"pdfprnt-buttons pdfprnt-buttons-post pdfprnt-top-right\"><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-json\/wp\/v2\/posts\/390?print=pdf\" class=\"pdfprnt-button pdfprnt-button-pdf\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/plugins\/pdf-print\/images\/pdf.png\" alt=\"image_pdf\" title=\"Afficher le PDF\" \/><span class=\"pdfprnt-button-title pdfprnt-button-pdf-title\">Enregistrer en PDF<\/span><\/a><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-json\/wp\/v2\/posts\/390?print=print\" class=\"pdfprnt-button pdfprnt-button-print\" target=\"_blank\"><\/a><\/div><p><strong><span style=\"color: #3366ff;\">I\u25ba Nous allons voir dans cet article comment configurer un Raid Logiciel de Niveau 1 (Mirorring) avec 2 unit\u00e9s de disques &#8230;.<\/span><\/strong><\/p>\n<p>Explication : Le raid de niveau 1 consiste \u00e0 \u00e9crire les donn\u00e9es simultan\u00e9ment sur 2 unit\u00e9s de disques identiques, on peut faire une construction \u00e0 3 disques en utilisant un disque dit de <strong><span style=\"color: #800080;\">spare<\/span><\/strong>.<br \/>En r\u00e9gime normal ce disque est inutilis\u00e9. En cas de panne d&#8217;un des 2 autres disque il prends automatiquement la place du disque d\u00e9faillant, sans passer par le phase de reconstruction du tablo raid !!<\/p>\n<p>La premi\u00e8re chose \u00e0 faire est de r\u00e9cup\u00e9rer l&#8217;outil mdadm : apt-get install mdadm (debian)<br \/>Nous allons pr\u00e9parer nos 2 unit\u00e9s de disques avec fdisk,\u00a0nous\u00a0cr\u00e9erons 2 partitions de taille identique sur les 2 unit\u00e9s de disques (m\u00eame nb. de cylindres) et nous leur donnerons un type sp\u00e9cifique au Raid : fd -&gt; Linux autodetect Raid &#8230;<\/p>\n<p>fdisk \/dev\/sdb <span style=\"color: #3366ff;\">#cr\u00e9ation d&#8217;une primaire de 1Go en type fd<\/span><br \/>fdisk \/dev\/sdc <span style=\"color: #3366ff;\">#idem<\/span><\/p>\n<p>Avant tout, assurons nous que les <strong><span style=\"color: #800080;\">superblocs<\/span> <\/strong>ne contiennent pas des infos ant\u00e9rieure de raid :<br \/>?\u00a0mdadm &#8211; &#8211; examine \/dev\/sdb1<br \/>?\u00a0mdadm &#8211; &#8211; examine \/dev\/sdc1<\/p>\n<p><span style=\"color: #3366ff;\">S&#8217;il y a des infos de raid, le\u00a0<\/span><span style=\"color: #800080;\"><strong>zeroing<\/strong>\u00a0<\/span><span style=\"color: #3366ff;\">va tout effacer, sinon tout est OK, le message de retour de la commande signifie qu&#8217;il n&#8217;y a pas d&#8217;informations de raid sur l&#8217;unit\u00e9 de disque.<\/span><br \/>?\u00a0mdadm &#8211; -zero-superblock \/dev\/sdb1<br \/>?\u00a0mdadm &#8211; -zero-superblock \/dev\/sdc1<\/p>\n<p>?\u00a0<strong><span style=\"color: #800080;\">cat \/proc\/partitions<\/span><\/strong> <span style=\"color: #3366ff;\">#permet de voir quelles partitions sont actuellement vues par le noyau<\/span><\/p>\n<p><strong><span style=\"color: #800080;\">mdadm &#8211; -create \/dev\/md0 &#8211; -level=1 &#8211; -raid-devices=2 \u00a0\/dev\/sdb1 \u00a0\/dev\/sdc1<\/span><\/strong><br \/><span style=\"color: #3366ff;\"># cr\u00e9e le raid de niveau 1 md0 avec 2 unit\u00e9s : il faut nommer le device md<sub>x<\/sub> !<br \/>#La synchro d\u00e9marre et dure quelques minutes.<\/span><\/p>\n<p><span style=\"color: #993300;\"><strong>mdadm &#8211; -create \/dev\/md0 &#8211; -level=1 &#8211; -raid-devices=2 \u00a0&#8211;spare-device=1 \/dev\/sdb1 \u00a0\/dev\/sdc1 \/dev\/sdd1<\/strong><\/span><br \/># un exemple avec un raid 1 et un disque de spare !<\/p>\n<p><span style=\"color: #ff0000;\"><strong>mdadm &#8211; -create \/dev\/md0 &#8211; -level=5 &#8211; -raid-devices=3 \u00a0\/dev\/sdb1 \u00a0\/dev\/sdc1 \/dev\/sdd1<\/strong><\/span><br \/># un exemple avec un raid 5 !<\/p>\n<p><strong><span style=\"color: #800080;\">cat \/proc\/mdsat<\/span><\/strong> <span style=\"color: #3366ff;\">ou<\/span> <strong><span style=\"color: #ff9900;\">watch<\/span> <span style=\"color: #800080;\">mdadm &#8211; -detail \/dev\/md0<br \/><\/span><\/strong><span style=\"color: #333333;\">#donne le d\u00e9tail du raid et la progression de la synchronisation des disques<br \/>on peut faire un <strong><span style=\"color: #3366ff;\"><span style=\"color: #ff9900;\">watch<\/span> cat \/proc\/mdstat<\/span> <\/strong>qui montre ne temps r\u00e9el la construction du tablo raid<\/span><\/p>\n<p>Quand la synchronisation initiale est finie, on va\u00a0enregistrer\u00a0la configuration du raid pourqu&#8217;elle soit r\u00e9utilisable au prochain reboot.<br \/><strong><span style=\"color: #800080;\">?\u00a0Pour Debian :<\/span><\/strong><br \/><strong>cp \/etc\/mdadm\/mdadm.conf \/etc\/mdadm\/mdadm.conf.orig<\/strong>\u00a0<span style=\"color: #3366ff;\">#on sauvegarde l&#8217;ancienne config<\/span><br \/><strong>\/usr\/share\/mdadm\/mkconf &gt; \/etc\/mdadm\/madam.conf<\/strong><br \/><strong><span style=\"color: #800080;\">?\u00a0Pour RH\/Centos :<\/span><br \/>mdadm &#8211; -detail &#8211; &#8211; scan &gt; \/etc\/mdadm.conf<\/strong><\/p>\n<ul>\n<li>update du RAM DISK du noyau<br \/>Car le Kernel g\u00e8re le hardware !<\/li>\n<\/ul>\n<p>update-initramfs -v -u<\/p>\n<p><span style=\"color: #3366ff;\"><span style=\"color: #333333;\">On va cr\u00e9er un FileSystem sur cette unit\u00e9 md0 afin de pouvoir la monter dans l&#8217;arborescence.<\/span><br \/>#on va cr\u00e9er un FS sur cet unit\u00e9 de raid :<\/span><br \/>mkfs.ext4 \/dev\/md0<br \/><span style=\"color: #3366ff;\">#on le monte :<\/span><br \/>mount -text4 \/dev\/md0 \/media\/raid1 <span style=\"color: #3366ff;\">#cr\u00e9er le r\u00e9p raid1 au pr\u00e9alable<\/span><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<p><span style=\"color: #800080;\"><strong>Mise en situation du RAID :<\/strong><\/span><\/p>\n<p>?\u00a0On place des donn\u00e9es (images -textes) dans \/media\/raid1<br \/>?\u00a0On d\u00e9branche \u00e0 chaud un disque USB<br \/>ou on supprime le disque avec les commandes mdadm en faisant :<br \/><strong><span style=\"color: #800080;\">mdadm &#8211; -fail \/dev\/md0 \/dev\/sdb1 \u00a0 (ou -f)<\/span><\/strong><br \/><strong><span style=\"color: #800080;\">mdadm &#8211; -remove \/dev\/md0 \/dev\/sdb1 (ou -r)<\/span><\/strong><br \/>(utile pour une image virtuelle sous VB)<br \/>on fait un mdadm &#8211;detail \/dev\/md0<br \/><span style=\"color: #3366ff;\">#le raid est pass\u00e9 de clean \u00e0 degraded avec une unit\u00e9 en removed<br \/>?\u00a0<span style=\"color: #333333;\">On rajoute d&#8217;autres donn\u00e9es :<\/span><br \/><\/span><\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture21.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-396\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture21.png\" alt=\"Capture2\" width=\"533\" height=\"99\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture21.png 533w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture21-300x55.png 300w\" sizes=\"auto, (max-width: 533px) 100vw, 533px\" \/><\/a><\/p>\n<p>?\u00a0On rajoute toujours \u00e0 chaud la seconde unit\u00e9 de disque :<br \/><strong><span style=\"color: #800080;\">mdadm &#8211; -add \/dev\/md0 \/dev\/sdc1<\/span><\/strong><br \/>Le raid repart en <strong>recovering<\/strong> :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture9.png\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-395 alignnone\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture9.png\" alt=\"Capture\" width=\"690\" height=\"370\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture9.png 690w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture9-300x160.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/Capture9-624x334.png 624w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><\/a><\/p>\n<p>Jusqu&#8217;\u00e0 la synchro totale et bien s\u00fbr les fichiers sont pr\u00e9sents dans les 2 unit\u00e9s de disques .<\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<p><strong><span style=\"color: #3366ff;\">?\u00a0Arr\u00eater | red\u00e9marrer | supprimer le RAID :<\/span><\/strong><br \/>Si le fichier de conf a bien \u00e9t\u00e9 fait, on peut facilement\u00a0arr\u00eater\u00a0ou relancer le raid existant :<br \/><strong><span style=\"color: #800080;\">mdadm &#8211; -stop \/dev\/md0<\/span><\/strong><br \/><strong><span style=\"color: #800080;\"> mdadm &#8211; -assemble \/dev\/md0<\/span><\/strong><\/p>\n<p>Pour supprimer totalement le raid<br \/><strong><span style=\"color: #800080;\">mdadm &#8211; &#8211; stop \/dev\/md0<br \/><\/span><\/strong><span style=\"color: #808080;\"><span style=\"color: #333333;\">On fait du z\u00e9roing sur les unit\u00e9s concern\u00e9es par ce raid pour effacer toute informations de Raid<\/span><strong><br \/><span style=\"color: #800080;\">mdadm &#8211; -zero-superblock \/dev\/sdb1 \/dev\/sdc1<\/span><\/strong><\/span><\/p>\n<p><em id=\"__mceDel\">\u00a0<\/em><\/p>\n<p><em>Michel BOCCIOLESI<\/em><\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2022\/12\/madadm-1024x566.png\" alt=\"\" class=\"wp-image-1944\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2022\/12\/madadm-1024x566.png 1024w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2022\/12\/madadm-300x166.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2022\/12\/madadm-768x424.png 768w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2022\/12\/madadm.png 1044w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p> I\u25ba Nous allons voir dans cet article comment configurer un Raid Logiciel de Niveau 1 (Mirorring) avec 2 unit\u00e9s de disques &#8230;. Explication : Le raid de &#8230;<\/p>\n","protected":false},"author":1,"featured_media":1541,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,34,39],"tags":[],"class_list":["post-390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-linux-admin","category-tutoriels"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Raid Logiciel Linux - Tutoriels et Cours<\/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:\/\/bocciolesi.fr\/tutoriels-et-cours\/raid-logiciel-linux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Raid Logiciel Linux - Tutoriels et Cours\" \/>\n<meta property=\"og:description\" content=\"I\u25ba Nous allons voir dans cet article comment configurer un Raid Logiciel de Niveau 1 (Mirorring) avec 2 unit\u00e9s de disques &#8230;. 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