ソフトウェアRAIDもメンドイな。と思ったので、LVMのMirrorに挑戦。
# lvcreate -m1 -L10G vg はできない。
Not enough PVs with free space available for parallel allocation.
Consider --alloc anywhere if desperate.
とかいわれる。
でも、# lvcreate -m1 -L10G --alloc anywhere vg とやったらやったで、
Insufficient suitable allocatable extents for logical volume : 5120 more required
とかいわれる。
解決方法
# lvcreate -m0 -L10G vg ---(A)
# lvconvert -m1 --alloc anywhere /dev/vg/lvol1 ---(B)
成功（？）
(A)の時点でのPhysical Volume状態
--- Physical volumes ---
PV Name /dev/hde1
PV UUID VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG
PV Status allocatable
Total PE / Free PE 76310 / 73750
PV Name /dev/hdg1
PV UUID P1eNlY-nZzW-T0js-36uU-ZDH7-iZS1-WHowz1
PV Status allocatable
Total PE / Free PE 76310 / 76310
(B)の時点でのPhysical Volume状態
--- Physical volumes ---
PV Name /dev/hde1
PV UUID VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG
PV Status allocatable
Total PE / Free PE 76310 / 73749
PV Name /dev/hdg1
PV UUID P1eNlY-nZzW-T0js-36uU-ZDH7-iZS1-WHowz1
PV Status allocatable
Total PE / Free PE 76310 / 73750
ミラーはされてるようだ。。。
vgdisplayの結果
# vgdisplay -v
Finding all volume groups
Finding volume group "vg"
--- Volume group ---
VG Name vg
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 17
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 596.17 GB
PE Size 4.00 MB
Total PE 152620
Alloc PE / Size 5121 / 20.00 GB
Free PE / Size 147499 / 576.17 GB
VG UUID Hvv743-wyL4-FnqB-yXA9-rmHa-DZ4A-AwxVJz
--- Logical volume ---
LV Name /dev/vg/lvol0
VG Name vg
LV UUID DtpLWw-rcDR-UEBy-j0EO-IpGq-86KN-I71m6B
LV Write Access read/write
LV Status available
# open 0
LV Size 10.00 GB
Current LE 2560
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
--- Logical volume ---
LV Name /dev/vg/lvol0_mlog
VG Name vg
LV UUID q7OZ1E-0ZVC-Nfg1-VpQs-nU1K-LLa9-Tvr8CJ
LV Write Access read/write
LV Status available
# open 1
LV Size 4.00 MB
Current LE 1
Segments 1
Allocation anywhere
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/vg/lvol0_mimage_0
VG Name vg
LV UUID zXHu0W-24XH-SW7j-wYUQ-DtgP-v3HP-tEfzZ2
LV Write Access read/write
LV Status available
# open 1
LV Size 10.00 GB
Current LE 2560
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2
--- Logical volume ---
LV Name /dev/vg/lvol0_mimage_1
VG Name vg
LV UUID QqgXbr-dzD5-7Lf7-2vc2-avpd-PVxH-oOtMqc
LV Write Access read/write
LV Status available
# open 1
LV Size 10.00 GB
Current LE 2560
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:3
--- Physical volumes ---
PV Name /dev/hde1
PV UUID VDCbqp-oWz7-ffD8-abb2-kM2y-Asdq-B3XLyG
PV Status allocatable
Total PE / Free PE 76310 / 73749
PV Name /dev/hdg1
PV UUID P1eNlY-nZzW-T0js-36uU-ZDH7-iZS1-WHowz1
PV Status allocatable
Total PE / Free PE 76310 / 73750
システム情報
# lvm version
LVM version: 2.02.28 (2007-08-24)
Library version: 1.02.22 (2007-08-21)
Driver version: 4.11.0
# uname -a
Linux localhost 2.6.23-gentoo-r9 #7 SMP Wed Mar 19 01:06:44 Local time zone must be set--see zic i686 Intel(R) Pentium(R) 4 CPU 2.60GHz GenuineIntel GNU/Linux