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2008-03-21

LVMでMirror

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。


# lvcreate -m0 -L10G vg してから、---(A)

# lvconvert -m1 --alloc anywhere /dev/vg/lvol1 すると成功(?)---(B)


(A)の時点のPVは↓こんなかんじ

--- 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)の時点のPVは↓こんなかんじ

--- 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。。。

-----------------------------------

# 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


ついで。

# 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

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