Linuxにおける、lvm2 on RAID1の構築方法。
忘れてしまうので、メモしておきます。
●ディスク追加（20120723）
/dev/sda 既存の１台目 2000.3 GB
/dev/sdb 既存の２台目 2000.3 GB
/dev/sdc 今回追加１台目 2000.3 GB
/dev/sdd 今回追加２台目 2000.3 GB
１）ディスクの現状確認
# fdisk -l /dev/sda
-----
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 64 79 128520 fd Linux raid autodetect
/dev/sda2 80 6159 48837600 fd Linux raid autodetect
/dev/sda3 6160 243201 1904039865 fd Linux raid autodetect
-----
# fdisk -l /dev/sdb
-----
Disk /dev/sdb: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 64 79 128520 fd Linux raid autodetect
/dev/sdb2 80 6159 48837600 fd Linux raid autodetect
/dev/sdb3 6160 243201 1904039865 fd Linux raid autodetect
-----
※参考まで。
２）fdiskでスライス。
下記のように、fdisk でスライス。
4096バイトセクタを考慮にいれ、スタートを64とする。
id は fd 。
# fdisk -l /dev/sdc
-----
Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 64 243201 1953005985 fd Linux raid autodetect
-----
# fdisk -l /dev/sdd
-----
Disk /dev/sdd: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 64 243201 1953005985 fd Linux raid autodetect
-----
３）RAID1を追加
# mdadm --create /dev/md3 --level=raid1 --raid-devices=2 /dev/sdc1 /dev/sdd1
-----
mdadm: array /dev/md3 started.
-----
# mdadm --detail /dev/md3
-----
/dev/md3:
Version : 0.90
Creation Time : Mon Jul 23 13:45:36 2012
Raid Level : raid1
Array Size : 1953005888 (1862.53 GiB 1999.88 GB)
Used Dev Size : 1953005888 (1862.53 GiB 1999.88 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Mon Jul 23 13:47:55 2012
State : active, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Rebuild Status : 1% complete
UUID : XXXX
Events : 0.2
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 8 49 1 active sync /dev/sdd1
-----
# cat /proc/mdstat
-----
Personalities : [raid1]
md3 : active raid1 sdd1[1] sdc1[0]
1953005888 blocks [2/2] [UU]
[>....................] resync = 0.1% (2493440/1953005888) finish=208.6min speed=155840K/sec
md0 : active raid1 sda1[1] sdb1[0]
128448 blocks [2/2] [UU]
md1 : active raid1 sda2[1] sdb2[0]
48837504 blocks [2/2] [UU]
md2 : active raid1 sda3[1] sdb3[0]
1904039744 blocks [2/2] [UU]
unused devices:
-----
４）mdadm.confに追記
# cd /etc
# cat mdadm.conf
-----
# mdadm.conf written out by anaconda
DEVICE partitions
MAILADDR root
ARRAY /dev/md0 level=raid1 num-devices=2 uuid=XXXX
ARRAY /dev/md1 level=raid1 num-devices=2 uuid=XXXX
ARRAY /dev/md2 level=raid1 num-devices=2 uuid=XXXX
-----
# cp mdadm.conf mdadm.conf-12072301
# mdadm --detail --scan
-----
ARRAY /dev/md2 level=raid1 num-devices=2 metadata=0.90 UUID=XXXX
ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 UUID=XXXX
ARRAY /dev/md0 level=raid1 num-devices=2 metadata=0.90 UUID=XXXX
ARRAY /dev/md3 level=raid1 num-devices=2 metadata=0.90 UUID=XXXX
-----
# mdadm --detail --scan >> mdadm.conf
# vi mdadm.conf
-----
# mdadm.conf written out by anaconda
DEVICE partitions
MAILADDR root
ARRAY /dev/md0 level=raid1 num-devices=2 uuid=XXXX
ARRAY /dev/md1 level=raid1 num-devices=2 uuid=XXXX
ARRAY /dev/md2 level=raid1 num-devices=2 uuid=XXXX
ARRAY /dev/md3 level=raid1 num-devices=2 uuid=XXXX
-----
５）lvm2を使うのでこちらも追加
・kvm2 ボリューム作成
# pvcreate /dev/md3
Writing physical volume data to disk "/dev/md3"
Physical volume "/dev/md3" successfully created
# vgcreate -s 32m VolGroup01-kvm2 /dev/md3
Volume group "VolGroup01-kvm2" successfully created
# lvcreate -n LogVol00 -l 100%FREE VolGroup01-kvm2
Logical volume "LogVol00" created
・できたか確認
# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup01-kvm2/LogVol00
VG Name VolGroup01-kvm2
LV UUID XXXX
LV Write Access read/write
LV Status available
# open 0
LV Size 1.82 TB
Current LE 59601
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID XXXX
LV Write Access read/write
LV Status available
# open 1
LV Size 1.77 TB
Current LE 58106
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
６）ext3でfsを構築
# mkfs.ext3 /dev/mapper/VolGroup01--kvm2-LogVol00
-----
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
244137984 inodes, 488251392 blocks
24412569 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
14901 block groups
32768 blocks per group, 32768 fragments per group
16384 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, 214990848
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 28 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
-----
７）仮マウント
# mount -t ext3 /dev/mapper/VolGroup01--kvm2-LogVol00 /kvm2
# df -k -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
ext3 1844389860 190922896 1558266096 11% /
/dev/md0 ext3 124387 47709 70256 41% /boot
tmpfs tmpfs 16465284 0 16465284 0% /dev/shm
/dev/mapper/VolGroup01--kvm2-LogVol00
ext3 1922360144 200164 1824509704 1% /kvm2
８）起動時に自動マウント
# cat /etc/fstab
-----
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
/dev/md0 /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/md1 swap swap defaults 0 0
/dev/VolGroup01-kvm2/LogVol00 /kvm2 ext3 defaults 0 0
-----
※/dev/VolGroup01-kvm2/LogVol00 を追加
・マウント確認
# df -k -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
ext3 1844389860 190922896 1558266096 11% /
/dev/md0 ext3 124387 47709 70256 41% /boot
tmpfs tmpfs 16465284 0 16465284 0% /dev/shm
# mount -a
# df -k -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
ext3 1844389860 190922896 1558266096 11% /
/dev/md0 ext3 124387 47709 70256 41% /boot
tmpfs tmpfs 16465284 0 16465284 0% /dev/shm
/dev/mapper/VolGroup01--kvm2-LogVol00
ext3 1922360144 200164 1824509704 1% /kvm2
あとは、リブートしてみて、マウントされていればＯＫ。
RAID1の再構築をひたすら待つ。
完了。