参考：
/dev/sdbと/dev/sdcに1TBのHDDがある状態で、この2台でソフトウェアRAID1を組んで見ました。
以下のコマンドを実行。
yum install dmraid mdadm
以下のコマンドを実行。
fdisk /dev/sdb
パーティションがある場合はまず削除します。
その後type=fd (Linux raid 自動検出)のパーティションを作成します。
もう1台のHDDでも同様に実行。
fdisk /dev/sdc
/etc/mdadm.confを編集。下記の行を追記。
# RAID1 on two 1TB disks
DEVICE /dev/sd[bc]1
ARRAY /dev/md0 devices=/dev/sdb1,/dev/sdc1
以下のコマンドを実行。
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[bc]1
継続して良いか聞かれるのでyを押す。
mdadm: /dev/sdb1 appears to contain an ext2fs file system
size=488287608K mtime=Wed Nov 2 18:33:48 2011
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: /dev/sdc1 appears to contain an ext2fs file system
size=976760000K mtime=Wed Nov 2 18:33:48 2011
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
状態確認。
mdadm --detail /dev/md0
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
976758841 blocks super 1.2 [2/2] [UU]
[>....................] resync = 1.9% (18636544/976758841) finish=168.2min speed=94907K/sec
unused devices:
[root@sunshine103 etc]# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed Nov 2 20:29:13 2011
Raid Level : raid1
Array Size : 976758841 (931.51 GiB 1000.20 GB)
Used Dev Size : 976758841 (931.51 GiB 1000.20 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Wed Nov 2 20:29:13 2011
State : clean, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Rebuild Status : 2% complete
Name : sunshine103:0 (local to host sunshine103)
UUID : 85baee8b:5601c9d3:146ff925:09e772cf
Events : 0
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
物理ボリューム作成。
pvcreate /dev/md0
物理エクステントサイズを計算。
bc
1024*1024/65000
16
物理ボリュームグループ作成。
vgcreate -s 16M lvm-raid /dev/md0
物理ボリュームグループ情報表示。
vgdisplay lvm-raid
--- Volume group ---
VG Name lvm-raid
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.50 GiB
PE Size 16.00 MiB
Total PE 59616
Alloc PE / Size 0 / 0
Free PE / Size 59616 / 931.50 GiB
VG UUID E0vNd7-vrMF-3CSL-tdhA-uIfW-opeQ-hy22su
512GBの論理ボリュームをlvm0という名前で作成。
lvcreate --size 512G lvm-raid -n lvm0
空き容量確認。
vgdisplay lvm-raid
--- Volume group ---
VG Name lvm-raid
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.50 GiB
PE Size 16.00 MiB
Total PE 59616
Alloc PE / Size 32768 / 512.00 GiB
Free PE / Size 26848 / 419.50 GiB
VG UUID E0vNd7-vrMF-3CSL-tdhA-uIfW-opeQ-hy22su
残りの容量一杯の論理ボリュームをlvm1という名前で作成。
lvcreate -l 26848 lvm-raid -n lvm1
状態確認。
vgdisplay lvm-raid
--- Volume group ---
VG Name lvm-raid
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.50 GiB
PE Size 16.00 MiB
Total PE 59616
Alloc PE / Size 59616 / 931.50 GiB
Free PE / Size 0 / 0
VG UUID E0vNd7-vrMF-3CSL-tdhA-uIfW-opeQ-hy22su
論理ボリューム内にext4ファイルシステムを作成。
mkfs -t ext4 /dev/lvm-raid/lvm0
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
33554432 inodes, 134217728 blocks
6710886 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
4096 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 34 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
mkfs -t ext4 /dev/lvm-raid/lvm1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
27492352 inodes, 109969408 blocks
5498470 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
3356 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 22 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
マウントポイントを作成。
mkdir /mnt/{TimeMachine,data}
/etc/fstabに以下の行を追加。
/dev/lvm-raid/lvm0 /mnt/TimeMachine ext4 defaults 0 0
/dev/lvm-raid/lvm1 /mnt/data ext4 defaults 0 0
マウント実行。
mount -a
