LVMでMirrorして片方外してみる

# mkreiserfs /dev/vg/lvol0
# mkdir /mnt/disk1
# mount /dev/vg/lvol0 /mnt/disk1/
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 115G 2.7G 107G 3% /
udev 10M 216K 9.8M 3% /dev
none 251M 0 251M 0% /dev/shm
/dev/mapper/vg-lvol0 10G 33M 10G 1% /mnt/disk1

# cd /mnt/disk1/
# od -x /dev/random > random.txt
# md5sum random.txt > random.md5
# ls -l
total 4

  • rw-r--r-- 1 root root 45 Mar 21 23:55 random.md5
  • rw-r--r-- 1 root root 0 Mar 21 23:55 random.txt

# reboot
(HDD1台取り外し)

# vgdisplay
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Volume group "vg" not found
# pvdisplay
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Can't read vg: skipping
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Couldn't find device with uuid 'VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG'.
Couldn't find all physical volumes for volume group vg.
Can't read vg: skipping

・・・ダメじゃん。。。
そもそもソフトウェアRAIDの代替になるような機能ではない?
よくわかりません>_