84 lines
2.6 KiB
Markdown
84 lines
2.6 KiB
Markdown
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---
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title: Howto LVM
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...
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* Voir [HowtoLVM]()
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* Voir [HowtoRAIDLogiciel]()
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Pendant des années nous avons été réticents à utiliser du LVM sur des volumes RAID, effrayés par des rumeurs de grosses pertes de données… mais surtout prudents de ne pas empiler 2 technologies complexes pour quelque chose d'aussi critique que du stockage.
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Puis, petit à petit, en utilisant le RAID logiciel (indispensable si l'on n'a pas de RAID hardware, pas si mal que ça) et le LVM (pratique dans pas mal de cas) indépendamment, on y vient.
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## Création du RAID
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On crée deux partitions `/dev/sda9` et `/dev/sdb9` de type "Linux raid autodetect" (FD).
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~~~
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# mdadm --create /dev/md8 --chunk=64 --level=raid1 --raid-devices=2 /dev/sda9 /dev/sdb9
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mdadm: Note: this array has metadata at the start and
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may not be suitable as a boot device. If you plan to
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store '/boot' on this device please ensure that
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your boot-loader understands md/v1.x metadata, or use
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--metadata=0.90
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Continue creating array? y
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mdadm: Defaulting to version 1.2 metadata
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mdadm: array /dev/md8 started.
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# mdadm --query /dev/md8
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/dev/md8: 37.25GiB raid1 2 devices, 0 spares. Use mdadm --detail for more detail.
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# mdadm --detail /dev/md8
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/dev/md8:
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Version : 1.2
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Creation Time : Sat Nov 20 22:23:28 2010
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Raid Level : raid1
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Array Size : 39060920 (37.25 GiB 40.00 GB)
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Used Dev Size : 39060920 (37.25 GiB 40.00 GB)
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Raid Devices : 2
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Total Devices : 2
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Persistence : Superblock is persistent
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Update Time : Sat Nov 20 22:23:28 2010
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State : clean, resyncing
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Active Devices : 2
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Working Devices : 2
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Failed Devices : 0
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Spare Devices : 0
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Rebuild Status : 2% complete
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Name : cap:8 (local to host cap)
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UUID : 66e00042:c24c606d:a276cb64:bdb476cc
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Events : 0
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Number Major Minor RaidDevice State
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0 8 9 0 active sync /dev/sda9
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1 8 25 1 active sync /dev/sdb9
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# cat /proc/mdstat
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Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
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md8 : active raid1 sdb9[1] sda9[0]
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39060920 blocks super 1.2 [2/2] [UU]
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[==>..................] resync = 14.7% (5757312/39060920) finish=7.2min speed=75992K/sec
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~~~
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## Création du LVM
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~~~
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# pvcreate /dev/md8
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Physical volume "/dev/md8" successfully created
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# vgcreate vg-over-raid /dev/md8
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Volume group "vg-over-raid" successfully created
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# lvcreate -L37G -nsrv vg-over-raid
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Logical volume "srv" created
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~~~
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## Utilisation
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~~~
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# mkfs.ext3 /dev/vg-over-raid/srv
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# mount /dev/vg-over-raid/srv /srv
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~~~
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