稼働中のLVMシステムでソフトウェアRAID1とGRUB2を正しくセットアップする

grub-install /dev/sda
grub-install /dev/sdb

reboot

df -h

root@server1:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/server1-root
4.5G  722M  3.6G  17% /
tmpfs                 249M     0  249M   0% /lib/init/rw
udev                  244M  128K  244M   1% /dev
tmpfs                 249M     0  249M   0% /dev/shm
/dev/md0              236M   18M  206M   8% /boot
root@server1:~#

cat /proc/mdstat

root@server1:~# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda5[2] sdb5[1]
4989940 blocks super 1.2 [2/2] [UU]

md0 : active raid1 sdb1[1]
248820 blocks super 1.2 [2/1] [_U]

unused devices: 
root@server1:~#

pvdisplay
vgdisplay
lvdisplay

root@server1:~# pvdisplay
--- Physical volume ---
PV Name               /dev/md1
VG Name               server1
PV Size               4.76 GiB / not usable 1012.00 KiB
Allocatable           yes (but full)
PE Size               4.00 MiB
Total PE              1218
Free PE               0
Allocated PE          1218
PV UUID               W4I07I-RT3P-DK1k-1HBz-oJvp-6in0-uQ53KS

root@server1:~#

root@server1:~# vgdisplay
--- Volume group ---
VG Name               server1
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  9
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               4.76 GiB
PE Size               4.00 MiB
Total PE              1218
Alloc PE / Size       1218 / 4.76 GiB
Free  PE / Size       0 / 0
VG UUID               m99fJX-gMl9-g2XZ-CazH-32s8-sy1Q-8JjCUW

root@server1:~#

root@server1:~# lvdisplay
--- Logical volume ---
LV Name                /dev/server1/root
VG Name                server1
LV UUID                8SNLPE-gHqA-a2LX-BO9o-0QQO-DV2z-3WvTYe
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                4.51 GiB
Current LE             1155
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:0

--- Logical volume ---
LV Name                /dev/server1/swap_1
VG Name                server1
LV UUID                kYaKtb-vkkV-TDDE-me1R-nnER-dzN8-BcVTwz
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                252.00 MiB
Current LE             63
Segments               1
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           253:1

root@server1:~#

fdisk /dev/sda

root@server1:~# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): <-- t
Partition number (1-5): <-- 1
Hex code (type L to list codes): <-- fd
Changed system type of partition 1 to fd (Linux raid autodetect)

Command (m for help): <-- w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
root@server1:~#

mdadm --add /dev/md0 /dev/sda1

cat /proc/mdstat

root@server1:~# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda5[2] sdb5[1]
4989940 blocks super 1.2 [2/2] [UU]

md0 : active raid1 sda1[2] sdb1[1]
248820 blocks super 1.2 [2/2] [UU]

unused devices: 
root@server1:~#

cp /etc/mdadm/mdadm.conf_orig /etc/mdadm/mdadm.conf
mdadm --examine --scan >> /etc/mdadm/mdadm.conf

# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#

# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
DEVICE partitions

# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes

# automatically tag new arrays as belonging to the local system
HOMEHOST 

# instruct the monitoring daemon where to send mail alerts
MAILADDR root

# definitions of existing MD arrays

# This file was auto-generated on Tue, 24 May 2011 21:11:37 +0200
# by mkconf 3.1.4-1+8efb9d1
ARRAY /dev/md/0 metadata=1.2 UUID=6cde4bf4:7ee67d24:b31e2713:18865f31 name=server1.example.com:0
ARRAY /dev/md/1 metadata=1.2 UUID=3ce9f2f2:ac89f75a:530c5ee9:0d4c67da name=server1.example.com:1

rm -f /etc/grub.d/09_swraid1_setup

update-grub
update-initramfs -u

grub-install /dev/sda
grub-install /dev/sdb

reboot