{"id":376,"date":"2024-07-03T10:20:15","date_gmt":"2024-07-03T09:20:15","guid":{"rendered":"http:\/\/www.bocciolesi.fr\/tutoriels-et-cours\/?p=376"},"modified":"2025-01-11T16:15:43","modified_gmt":"2025-01-11T15:15:43","slug":"logical-volume-manager","status":"publish","type":"post","link":"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/logical-volume-manager\/","title":{"rendered":"Logical Volume Manager"},"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\/376?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\/376?print=print\" class=\"pdfprnt-button pdfprnt-button-print\" target=\"_blank\"><\/a><\/div><p><span style=\"color: #3366ff;\"><strong>I\u25ba Logical Volume Manager Linux<\/strong><\/span><\/p>\n<p>\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/2024-07-03_10h58_16.png\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"700\" src=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/2024-07-03_10h58_16.png\" alt=\"\" class=\"wp-image-1994\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/2024-07-03_10h58_16.png 989w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/2024-07-03_10h58_16-300x212.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/02\/2024-07-03_10h58_16-768x544.png 768w\" sizes=\"auto, (max-width: 989px) 100vw, 989px\" \/><\/a><\/figure>\n\n\n<p>Le <strong><span style=\"color: #3366ff;\">LVM<\/span><\/strong> sous Linux permet d&#8217;exploiter au maximum les ressources (les espaces) des unit\u00e9s de stockage (disques) &#8230;<br \/>Le <strong><span style=\"color: #3366ff;\">LVM<\/span> <\/strong>est compos\u00e9 de :<\/p>\n<ul>\n<li><span style=\"line-height: 1.714285714; font-size: 1rem;\">Les Physical Volume (<strong><span style=\"color: #3366ff;\">PV<\/span><\/strong>) qui recensent les unit\u00e9s ou partitions concern\u00e9es<\/span><\/li>\n<li>Le(s) Volume Group (<strong><span style=\"color: #3366ff;\">VG<\/span><\/strong>) qui vont contenir 1 ou plusieurs PV<br \/>Il peut y avoir plusieurs groupes d\u00e9finis en fonction des besoins de stockage (ex: nas &#8211; video &#8211; BDD)<\/li>\n<li>Le(s) Logical Volume (<strong><span style=\"color: #3366ff;\">LV<\/span><\/strong>) qui cr\u00e9ent des unit\u00e9s de disque\u00a0<span style=\"text-decoration: underline;\">virtuels\u00a0<\/span>(visible sous \/dev) et que l&#8217;on peut utiliser comme un disque &#8216;<span style=\"text-decoration: underline;\">r\u00e9el<\/span>&#8216;<\/li>\n<\/ul>\n<p><span style=\"line-height: 24px;\"><span style=\"text-decoration: underline;\"><span style=\"color: #3366ff; text-decoration: underline;\"><strong>NB<\/strong> <\/span><\/span>: un fichier peut \u00eatre enregistr\u00e9 en partie sur telle ou telle unit\u00e9 de stockage. La difficult\u00e9 en cas de crash serait de localiser les bribes du m\u00eame fichier diss\u00e9min\u00e9es on ne sait ou !<br \/>C&#8217;est pour cela que le LVM est tr\u00e8s souvent coupl\u00e9 \u00e0 du RAID (qui pourra assurer la restauration des donn\u00e9es)<\/span><\/p>\n<p>Installation de l&#8217;utilitaire LVM :<br \/>apt-get install lvm2 (debian)<br \/>yum install lvm2 (RH\/Centos)<\/p>\n<p><span style=\"text-decoration: underline;\"><strong><span style=\"color: #3366ff; text-decoration: underline;\">TP<\/span> <\/strong><\/span>: Cr\u00e9ation d&#8217;un LVM sur une m\u00eame unit\u00e9 de stockage<\/p>\n<p><span style=\"color: #ff0000;\"><strong>Formatage du disque ( disque USB ) :<\/strong><\/span><br \/>fdisk \/dev\/sdb ou gdisk \/dev\/sdb<\/p>\n<p>&#8211; Rappel : n(new partition) t(type) w(write)<br \/>&#8211; On cr\u00e9e 3 disques de type Linux LVM (T=8E00) sdb &#8211; sdc &#8211; sdd<br \/>On a au maximum 30Go (3 partitions de 10Go)<\/p>\n<p><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2024\/07\/lvm1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2025\" src=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2024\/07\/lvm1.png\" alt=\"\" width=\"702\" height=\"839\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2024\/07\/lvm1.png 702w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2024\/07\/lvm1-251x300.png 251w\" sizes=\"auto, (max-width: 702px) 100vw, 702px\" \/><\/a><\/p>\n<p><span style=\"color: #ff0000;\"><strong>Cr\u00e9ation des PV :<\/strong><\/span><br \/>pvcreate \/dev\/sdb1<br \/>pvcreate \/dev\/sdc1<br \/>pvcreate \/dev\/sdd1<br \/><span style=\"line-height: 1.714285714; font-size: 1rem;\">Un\u00a0petit\u00a0<\/span><strong style=\"line-height: 1.714285714; font-size: 1rem;\">pvs<\/strong><span style=\"line-height: 1.714285714; font-size: 1rem;\"> ou <\/span><strong style=\"line-height: 1.714285714; font-size: 1rem;\">pvdisplay<\/strong><span style=\"line-height: 1.714285714; font-size: 1rem;\">\u00a0<\/span><span style=\"line-height: 1.714285714; font-size: 1rem; color: #3366ff;\"> #pour v\u00e9rifier le tout &#8230;<\/span><\/p>\n<p><strong><span style=\"color: #ff0000;\">Cr\u00e9ation du Groupe :<\/span><br \/><\/strong>vgcreate vg0 \/dev\/sdb1 \/dev\/sdc1<br \/>un petit <strong>vgs<\/strong> ou <strong>vgdisplay<\/strong><span style=\"color: #3366ff;\"> #pour v\u00e9rifier<\/span> &#8230; (d\u00e9j\u00e0 vu) \ud83d\ude42<\/p>\n<p><span style=\"color: #ff0000;\"><strong>Cr\u00e9ation du Volume :<\/strong><\/span><br \/>lvcreate -L2G (ou g) -n\/dev\/vg0\/lv0 <br \/># L pour la taille<\/p>\n<p>lvcreate -l 100%VG -n\/dev\/vg0\/lv0 <br \/># l pour le nombre d&#8217;extents<\/p>\n<p><em id=\"__mceDel\"><em id=\"__mceDel\"> <span style=\"color: #3366ff;\">#on prend 2Go sur l&#8217;espace disponible du groupe MonGroupe<\/span><br \/>un petit <strong>lvs<\/strong> ou <strong>lvdisplay<\/strong> <span style=\"color: #3366ff;\">#&#8230;&#8230;.<\/span><\/em><\/em><\/p>\n<p><span style=\"color: #ff0000;\"><strong>Cr\u00e9ation du File System :<\/strong><\/span><br \/>mkfs.ext4 -m1 \/dev\/vg0\/lv0<br \/>ou<br \/><strong><span style=\"color: #ff0000;\">mkfs.btrfs \/dev\/vg0\/lv0<\/span><\/strong><br \/>#m1 r\u00e9servera simplement 1% des blocs \u00e0 root -&gt; convenable de nos jours vu les &#8216;gros&#8217; disques !<\/p>\n<p><strong>Montage du Device :<\/strong><br \/>mount -text4 \/dev\/vg0\/lv0 \/mnt\/LVM<\/p>\n<p>On place des fichiers dans ce point de montage pou v\u00e9rifier que les donn\u00e9es seront conserv\u00e9es m\u00eame dans le cas du resize<\/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;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<\/p>\n<p><strong><span style=\"color: #3366ff;\">Augmentation de l&#8217;espace du LVM :<\/span><\/strong><\/p>\n<p>On peut augmenter \u00e0 chaud la taille du LVM sans d\u00e9monter le point de montage, donc sans g\u00eaner les utilisateurs en production !<\/p>\n<p>NB : si on souhaite tout de m\u00eame arr\u00eater la production et d\u00e9monter =&gt;\u00a0<em>umount -l \/mnt\/LVM<br \/><\/em><span style=\"color: #3366ff;\"> #on d\u00e9monte avec paresse \ud83d\ude42 (Lazyness) le point de montage<\/span><\/p>\n<p>On rajoute un nouveau disque :<br \/>mkfs.ext4 -m1 \/dev\/sdd1<span style=\"color: #3366ff;\"> #on cr\u00e9ee le FS EXTxxx sur la partition)<\/span><br \/><strong>vgextend<\/strong> \/dev\/vg0 \/dev\/sdd1<span style=\"color: #3366ff;\"> #On \u00e9tend le groupe avec le(s) nouveau(x) PV<\/span><br \/><strong>lvresize<\/strong> -L+1G \/dev\/vg0\/lv0<br \/><span style=\"color: #3366ff;\">#ou lvresize -L3G \/dev\/vg0\/lv0<\/span><\/p>\n<p><span style=\"color: #3366ff;\">\u263c\u00a0ou mieux pour occuper tout l&#8217;espace disponible du VG (option petit L)<br \/><span style=\"color: #993366;\"><strong>lvresize<\/strong> -l 100%VG \/dev\/vg0\/lv0<\/span><br \/><\/span><\/p>\n<p><span style=\"color: #3366ff;\"><span style=\"color: #000000;\"><strong>df -h \/mnt\/LVM<\/strong><\/span> #doit montrer le nouvel espace ?<br \/>ET non attention l&#8217;information de redimensionnement du LVM physique n&#8217;est pas transmise au point de montage ! \u25ba<\/span>L&#8217;information de\u00a0redimensionnement n&#8217;est pas automatiquement r\u00e9cup\u00e9r\u00e9e.<br \/><strong><span style=\"color: #0000ff;\">resize2fs \/dev\/vg0\/lv0 <\/span><\/strong><span style=\"color: #0000ff;\"><em>(pour les FS EXT)<\/em><\/span><br \/>ou<br \/><strong><span style=\"color: #ff0000;\">btrfs filesystem resize max \/mnt\/LVM\u00a0<\/span><\/strong><span style=\"color: #ff0000;\"><em>(pour les FS BTRFS)<\/em><\/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;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<br \/>Les informations de conf de LVM sont stock\u00e9es dans \/etc\/lvm\/archive <em>automatiquement !<br \/>Bon \u00e0 savoir pour restaurer un LVM<\/em><\/p>\n<p>NB : lvresize fonctionne en +, en &#8211; ou en valeur exacte \ud83d\ude42<br \/><strong>lvresize<\/strong>\u00a0-L+1G \/dev\/MonGroupe\/MonVolume<br \/><strong>lvresize<\/strong>\u00a0-L-550M \/dev\/MonGroupe\/MonVolume <em><span style=\"color: #3366ff;\"># Attention on peut perdre des donn\u00e9es<\/span><\/em><br \/><strong>lvresize<\/strong>\u00a0-L4G \/dev\/MonGroupe\/MonVolume<\/p>\n<p>et Voil\u00e0 pour l&#8217;article &#8230;.<\/p>\n<p><em>Michel BOCCIOLESI<\/em><\/p>\n<div id=\"wrchoverdiv\">\u00a0<\/div>\n\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p> I\u25ba Logical Volume Manager Linux Le LVM sous Linux permet d&#8217;exploiter au maximum les ressources (les espaces) des unit\u00e9s de stockage (disques) &#8230;Le LVM est compos\u00e9 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":[30],"class_list":["post-376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-linux-admin","category-tutoriels","tag-lvm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - 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