{"id":107,"date":"2019-01-07T13:16:56","date_gmt":"2019-01-07T12:16:56","guid":{"rendered":"http:\/\/blog.nosland.com\/?p=107"},"modified":"2019-01-07T13:40:35","modified_gmt":"2019-01-07T12:40:35","slug":"lvm","status":"publish","type":"post","link":"http:\/\/blog.nosland.com\/?p=107","title":{"rendered":"LVM"},"content":{"rendered":"\n

Exemple d’utilisation de LVM. La machine choisie est\u00a0une\u00a0Debian\u00a0parce avec deux disques.<\/p>\n\n\n\n

Disques<\/h4>\n\n\n\n

On va regarder les disques avec la commande\u00a0fdisk<\/code>:<\/p>\n\n\n\n

$ sudo fdisk -l \/dev\/sda \/dev\/sdb
Disk \/dev\/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Device Boot Start End Sectors Size Id Type
\/dev\/sda1 2048 62914559 62912512 30G 8e Linux LVM

Disk \/dev\/sdb: 200 GiB, 214748364800 bytes, 419430400 sectors
Device Boot Start End Sectors Size Id Type
\/dev\/sdb1 2048 419430399 419428352 200G 8e Linux LVM<\/p>\n\n\n\n

Il y a deux disques: un de 30\u00a0GB<\/abbr>\u00a0et un de 200\u00a0GB<\/abbr>. Chaque disque h\u00e9berge une partition LVM:\u00a0\/dev\/sda1<\/code>\u00a0et\u00a0\/dev\/sdb1<\/code>.<\/p>\n\n\n\n

Physical Volume<\/h4>\n\n\n\n

Ces deux partitions sont utilis\u00e9es dans des PV (Physical Volume)<\/p>\n\n\n\n

$ sudo pvs

PV VG Fmt Attr PSize PFree
\/dev\/sda1 vg1 lvm2 a– 30.00g 11.00g
\/dev\/sdb1 vg2 lvm2 a– 200.00g 20.00g<\/p>\n\n\n\n

Volume Group<\/h4>\n\n\n\n

Chaque PV est utilis\u00e9 dans un VG (Volume Group):<\/p>\n\n\n\n

$ sudo vgs
VG #PV #LV #SN Attr VSize VFree
vg1 1 7 0 wz–n- 30.00g 11.00g
vg2 1 1 0 wz–n- 200.00g 20.00g<\/p>\n\n\n\n

Il y a deux VG:\u00a0vg1<\/code>\u00a0et\u00a0vg2<\/code>. Les informations sont indentiques \u00e0 ce que renvoie\u00a0pvs<\/code>\u00a0parce qu’il n’y a qu’un seul PV dans chaque VG. Il est possible d’\u00e9tendre un VG en ajoutant un autre PV.<\/p>\n\n\n\n

Logical Volume<\/h4>\n\n\n\n

Chaque VG fournit de la place pour plusieurs LV (Logical Volume):<\/p>\n\n\n\n

$ sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home vg1 -wi-ao—- 1000.00m postgres vg1 -wi-ao—- 5.00g
slash vg1 -wi-ao—- 976.00m
swap vg1 -wi-ao—- 1.24g
tmp vg1 -wi-ao—- 1000.00m
usr vg1 -wi-ao—- 3.91g
var vg1 -wi-ao—- 5.95g
data vg2 -wi-ao—- 180.00g <\/p>\n\n\n\n

Toutes les filesystems sont contenus dans\u00a0vg1<\/code>, sauf\u00a0data<\/code>\u00a0qui se trouve dans\u00a0vg2<\/code><\/p>\n\n\n\n

Ce sont ces filesystem qu’on peut voir avec la commande df<\/code>:<\/p>\n\n\n\n

$ df -h
Filesystem Size Used Avail Use% Mounted on
\/dev\/dm-0 1.8G 1.3G 335M 80% \/
udev 10M 0 10M 0% \/dev
tmpfs 148M 18M 131M 12% \/run
\/dev\/mapper\/vg-usr 1.5G 1.4G 524M 98% \/usr
tmpfs 370M 0 370M 0% \/dev\/shm
tmpfs 5.0M 0 5.0M 0% \/run\/lock
tmpfs 370M 0 370M 0% \/sys\/fs\/cgroup
\/dev\/sda1 180M 48M 120M 29% \/boot
\/dev\/mapper\/vg-var 2.4G 1.1G 1.2G 48% \/var
\/dev\/mapper\/vg-tmp 597M 4.1M 558M 1% \/tmp
\/dev\/mapper\/vg-home 1.8G 786M 879M 48% \/home
\/dev\/sdb1 985G 141G 794G 16% \/images
tmpfs 74M 0 74M 0% \/run\/user\/65534
tmpfs 74M 0 74M 0% \/run\/user\/1001
<\/p>\n","protected":false},"excerpt":{"rendered":"

Exemple d’utilisation de LVM. La machine choisie est\u00a0une\u00a0Debian\u00a0parce avec deux disques. Disques On va regarder les disques avec la commande\u00a0fdisk:…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/posts\/107"}],"collection":[{"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=107"}],"version-history":[{"count":2,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/posts\/107\/revisions"}],"predecessor-version":[{"id":112,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=\/wp\/v2\/posts\/107\/revisions\/112"}],"wp:attachment":[{"href":"http:\/\/blog.nosland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=107"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.nosland.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}