{"id":1614,"date":"2013-10-25T08:39:33","date_gmt":"2013-10-25T06:39:33","guid":{"rendered":"http:\/\/www.extradrm.com\/?p=1614"},"modified":"2014-01-19T10:55:40","modified_gmt":"2014-01-19T08:55:40","slug":"lvm-volume-group-management-on-centos-6","status":"publish","type":"post","link":"https:\/\/www.extradrm.com\/?p=1614","title":{"rendered":"LVM \u2013 Volume Group Management on CentOS 6"},"content":{"rendered":"

In computer storage, logical volume management or LVM provides a method of allocating space on mass-storage devices that is more flexible than conventional partitioning schemes.<\/p>\n

In particular, a volume manager can concatenate, stripe together or otherwise combine partitions into larger virtual ones that administrators can re-size or move, potentially without interrupting system use.<\/p>\n

Here is the basic design scheme:<\/p>\n

\"LVM<\/a>

LVM partitions Linux<\/p><\/div>\n

Le syst\u00e8me de LVM ins\u00e8re des sous-couches entre la partition de disque et votre syst\u00e8me de fichier (l\u00e0 o\u00f9 sont vos donn\u00e9es). Ces sous-couches vont vous permettre de modifier dynamiquement la taille des syst\u00e8mes de fichier, sans mettre en p\u00e9ril vos donn\u00e9es. Ainsi vous pourrez ajouter, enlever de l’espace disque d’un filesystem \u00e0 la vol\u00e9e, rajouter un syst\u00e8me de fichier… sans modification de la table des partitions.Ces deux couches se nomment : le “Volume Group (Abr\u00e9viation : VG)” et le “Logical Volume (ou LV)”.A un “Volume Group”, nous affecterons des partitions de disque. Chaque disque ou partition de disque affect\u00e9 \u00e0 un VG lui est exclusivement r\u00e9serv\u00e9. Il est impossible d’affecter un m\u00eame disque \u00e0 plusieurs VG.Dans chaque VG, nous cr\u00e9erons plusieurs LV. Chaque LV sera alors format\u00e9 et mont\u00e9 dans notre arborescence pour y \u00eatre utilis\u00e9 par l’utilisateur final.
\nQuand nous formatons un LV, nous cr\u00e9ons en fait un syst\u00e8me de fichier (fs) : c’est cette couche que vous utilisez lorsque vous effectuez l’op\u00e9ration de montage.Un petit sch\u00e9ma :<\/div>\n
\n\n\n\n
\n
Partition(s) de disque\r\n\t|----> Volume Group\r\n\t\t|----> Logicals Volumes\r\n\t\t\t|----> syst\u00e8me de fichiers<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Au lieu de :<\/div>\n
\n\n\n\n
\n
Une partition de disque\r\n\t|---->un syst\u00e8me de fichier<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Ces couches interm\u00e9diaires vont donc permettre une meilleure mobilit\u00e9 de nos syst\u00e8mes de fichiers. (source article<\/a>)<\/div>\n
<\/div>\n
Exemple de partitionnement Centos pendant l’ installation :<\/p>\n
For a New 1 TB Drive that is unformatted<\/p>\n
Check Custom Setup<\/strong><\/p>\n
#
\n# Create Physical Partion For Boot<\/strong>
\n#
\nselect Standard Partition
\nselect \/boot for mount point
\nSize 200mb
\nFixed size
\nselect force to be primary partition<\/p>\n
#
\n# Create Logical Physical Volume<\/strong>
\n#<\/p>\n
Click Create
\nCheck LVM Physical Volume
\nSize 950000 MB
\nFill to Maximium Size
\nForce To BE PRimary Partition<\/p>\n
Volume Group Name vg_delldesktop<\/strong><\/p>\n
Click Create
\nSelect LVM Volume Group
\nPhysical Extent 4MB<\/p>\n
Click Add Under Logical Volume \/\u00a0vg_delldesktop<\/strong><\/strong><\/p>\n
lv_root 20480 \/ ext4 Boot and OS files
\nlv_swap 20480 (20GB) swap swap swap File
\nlv_home 20480 (20GB) \/home ext4 User Directories
\nlv_var 20480 (20GB) \/var ext4 OS Logs
\nlv_tmp 10240 (10GB) \/tmp ext4 Temporary Files
\nlv_u01 256000 (250GB) \/u01 ext4 Oracle Binaries and Logs
\nlv_u02 256000 (250GB) \/u02 ext4 Oracle\/Mysql Data Base Files
\nlv_flashback 102400 (100GB) \/u01\/app\/oracle\/flashback ext4 Oracle Flash Back Area
\nTotal 686080
\nDisk Capacity 953664
\nFree Space 247104<\/p>\n
**Boot Device
\nRelocate to First sector of SDA2<\/p>\n
You can see also a video tutorial for an install of centos with LVM partitions for oracle :<\/p>\n
Install CentOS for Oracle<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
In computer storage, logical volume management or LVM provides a method of allocating space on mass-storage devices that is more flexible than conventional partitioning schemes. In particular, a volume manager can concatenate, stripe together...<\/p>\n","protected":false},"author":1,"featured_media":2843,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[251,252,253,254],"youtube_video":null,"_links":{"self":[{"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/posts\/1614"}],"collection":[{"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1614"}],"version-history":[{"count":0,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/posts\/1614\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=\/wp\/v2\/media\/2843"}],"wp:attachment":[{"href":"https:\/\/www.extradrm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.extradrm.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}