Ubuntu 11.10 RAID1のmdデバイスからLVM作成方法

<概要>

[Ubuntu 11.10]環境にて「RAID1のmdデバイスからLVM作成方法」を紹介します。

<事前確認>

1.Partitions構成確認
# lsblk
2.LVMに参加させるPhysical Volume
# pvcreate /dev/md125 (一例)
Physical volume “/dev/md125″ successfully created
3.Physical Valume確認
# pvscan

<目次>

1.Volume Group Name作成
2.Volume Group 確認
3.Volume Group Size byte単位確認
4.Logical Volume作成
5.作成したLVのDeviceを確認する
6.File System Format
7.Partitions確認
8.LVのmountテスト

<作成手順>

1.Volume Group Name作成
# vgcreate VolGroup2 /dev/md125
Volume group “VolGroup2″ successfully created

2.Volume Group 確認

# vgdisplay VolGroup2

3.Volume Group Size byte単位確認

# vgdisplay –units b VolGroup2

4.Logical Volume作成

# lvcreate -L 500095254528B -n LogicalVol01 VolGroup2
Logical volume “LogicalVol01″ created

5.作成したLVのDeviceを確認する

# fdisk -l

…(省略)…
Disk /dev/mapper/VolGroup2-LogicalVol01: 500.1 GB, 500095254528 bytes
…(省略)…

6.File System Format:

# mkfs.ext4 /dev/mapper/VolGroup2-LogicalVol01
mke2fs 1.41.14 (22-Dec-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=1 blocks, Stripe width=1 blocks
30523392 inodes, 122093568 blocks
6104678 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
3726 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

7.Partitions確認

# parted /dev/mapper/VolGroup2-LogicalVol01 print
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/VolGroup2-LogicalVol01: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 500GB 500GB ext4

8.LVのmountテスト

# mount /dev/mapper/VolGroup2-LogicalVol01 /hdd

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