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Disk2 Disk3 Disk4
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| XXGB | | YYG | | ZZGB | 物理Disk
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| | |
V V V
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| | | | | |
| sdb1 | | sdc1 | | sdd1 | 物理ボリューム(PV)
| | | | | |
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| | |
V V V
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| | 論理ボリュームグループ(VG)
| Volume 00 |
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| |
V V
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| | | | 論理ボリューム(LV)
| Log Vol 01 | | Log Vol 02 |
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| |
V V
/mnt1 /mnt2 マウントポイント
# /sbin/fdisk /dev/sdb1 /dev/sdb1 1 783 6289416 8e Linux LVM
# /sbin/fdisk -l
Disk /dev/sdb: 6442 MB, 6442450944 bytes
255 heads, 63 sectors/track, 783 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 783 6289416 8e Linux LVM
Disk /dev/sdc: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 1044 8385898+ 8e Linux LVM
Disk /dev/sde: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sde1 1 1305 10482381 8e Linux LVM
パーティションを物理ボリュームとして初期化
# /usr/sbin/pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created # /usr/sbin/pvcreate /dev/sdc1 Physical volume "/dev/sdc1" successfully created # /usr/sbin/pvcreate /dev/sde1 Physical volume "/dev/sde1" successfully created
LVMの領域として利用するすべての物理ボリュームに対して、初期化が完了した物理ボリュームは、/sbin/pvscanで確認
# /sbin/pvscan PV /dev/sda2 VG VolGroup00 lvm2 [15.88 GB / 0 free] PV /dev/sdb1 lvm2 [6.00 GB] PV /dev/sdc1 lvm2 [8.00 GB] PV /dev/sde1 lvm2 [10.00 GB] Total: 4 [39.87 GB] / in use: 1 [15.88 GB] / in no VG: 3 [23.99 GB]
# /usr/sbin/vgcreate VolGroup01 /dev/sdb1 /dev/sdc1 /dev/sde1 Volume group "VolGroup01" successfully created
# /sbin/vgscan Reading all physical volumes. This may take a while... Found volume group "VolGroup01" using metadata type lvm2 Found volume group "VolGroup00" using metadata type lvm2
# /usr/sbin/vgremove Volume00 Volume group "Volume00" successfully removed
PE(Physical Extent)
ボリュームグループはPEという単位の集まり、PEの大きさはデフォルトでは4MB、つのボリュームグループは最大64K個までのPE、デフォルトでは１つのボリュームグループの大きさは最大で256GB(4MB X 64k) vgcreateコマンドの -s オプションでPEのサイズを変更可能。
7GBの論理ボリューム(LogVol01)をボリュームグループ(VolGroup01)から作成
# /usr/sbin/lvcreate -L 7G -n LogVol01 VolGroup01 Logical volume "LogVol01" created
# /usr/sbin/lvdisplay --- Logical volume --- LV Name /dev/VolGroup01/LogVol01 VG Name VolGroup01 LV UUID 8vxvb9-1O1c-EwyS-W5N9-Fpsv-g8xO-MH0efZ LV Write Access read/write LV Status available # open 0 LV Size 7.00 GB Current LE 1792 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2
# /usr/sbin/lvremove /dev/VolGroup01/LogVol01 Do you really want to remove active logical volume LogVol01? [y/n]: y Logical volume "LogVol01" successfully removed
「/dev/ボリュームグループ名/論理ボリューム名」となる
# /sbin/mkfs -t ext3 /dev/VolGroup01/LogVol11 mke2fs 1.39 (29-May-2006) Filesystem label= OS type: Linux （略） This filesystem will be automatically checked every 34 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
マウント
# mount /dev/VolGroup01/LogVol11 /mnt1
# mount /dev/mapper/VolGroup01-LogVol11 on /mnt1 type ext3 (rw)
# /usr/sbin/lvextend -L +1024M /dev/VolGroup01/LogVol11 Extending logical volume LogVol11 to 8.00 GB Logical volume LogVol11 successfully resized
# /sbin/resize2fs /dev/VolGroup01/LogVol11 resize2fs 1.39 (29-May-2006) Filesystem at /dev/VolGroup01/LogVol11 is mounted on /mnt1; on-line resizing required Performing an on-line resize of /dev/VolGroup01/LogVol11 to 2097152 (4k) blocks. The filesystem on /dev/VolGroup01/LogVol11 is now 2097152 blocks long.
# df
/dev/mapper/VolGroup01-LogVol11
8256952 363528 7474008 5% /mnt1
縮小時はumountの必要あり
FileSystemの縮小(ext3/ext4)(6GBに)
# umount /mnt1 # /sbin/fsck.ext3 -f /dev/VolGroup01/LogVol11 e2fsck 1.39 (29-May-2006) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/VolGroup01/LogVol11: 10076/1048576 files (0.1% non-contiguous), 123796/2097152 blocks
# /sbin/resize2fs /dev/VolGroup01/LogVol11 6G resize2fs 1.39 (29-May-2006) Resizing the filesystem on /dev/VolGroup01/LogVol11 to 1572864 (4k) blocks. The filesystem on /dev/VolGroup01/LogVol11 is now 1572864 blocks long.
# /usr/sbin/lvreduce -L -2GB /dev/VolGroup01/LogVol11 WARNING: Reducing active logical volume to 6.00 GB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce LogVol11? [y/n]: y Reducing logical volume LogVol11 to 6.00 GB Logical volume LogVol11 successfully resized
# mount -t ext3 /dev/VolGroup01/LogVol11 /mnt
# df
/dev/mapper/VolGroup01-LogVol11
6192704 361740 5579308 7% /mnt
# /usr/sbin/vgdisplay VolGroup01 --- Volume group --- VG Name VolGroup01 System ID Format lvm2 (略) VG Size 23.99 GB <==元容量 PE Size 4.00 MB Total PE 6141 Alloc PE / Size 1536 / 6.00 GB Free PE / Size 4605 / 17.99 GB VG UUID BaY2tc-6r9Q-00nn-rE7D-cjsj-f5jH-r4TeIw
追加
# /usr/sbin/vgextend VolGroup01 /dev/sdf Volume group "VolGroup01" successfully extended
# /usr/sbin/vgdisplay VolGroup01 --- Volume group --- VG Name VolGroup01 System ID Format lvm2 (略) VG Size 27.98 GB <= sdf 4GBが追加された PE Size 4.00 MB Total PE 7164 Alloc PE / Size 1536 / 6.00 GB Free PE / Size 5628 / 21.98 GB VG UUID BaY2tc-6r9Q-00nn-rE7D-cjsj-f5jH-r4TeIw
PV内のPE(Physical Extent:物理エクステント)を同一VG内の別のPVに移動し、切り離し可能な状態にする
PE移動
# /usr/sbin/pvmove /dev/sdc1 /dev/sdc1: Moved: 0.1% /dev/sdc1: Moved: 13.9% (略) /dev/sdc1: Moved: 93.8% /dev/sdc1: Moved: 100.0%
切り離し
# /usr/sbin/vgreduce VolGroup01 /dev/sdc1 Removed "/dev/sdc1" from volume group "VolGroup01"
# /usr/sbin/pvdisplay /dev/sdc1 "/dev/xvdc1" is a new physical volume of "8.00 GB" --- NEW Physical volume --- PV Name /dev/sdc1 VG Name PV Size 8.00 GB <=sdcの容量 (略) Allocated PE 0 PV UUID N1hPFy-W0jy-uLN1-4DOT-5ZKk-ZczK-w2kf1v
確認
# /usr/sbin/vgdisplay VolGroup01 --- Volume group --- VG Name VolGroup01 System ID (略) VG Size 19.99 GB <= 元 28GBからsdc(8GB)が切り離された PE Size 4.00 MB Total PE 5117 Alloc PE / Size 1536 / 6.00 GB Free PE / Size 3581 / 13.99 GB VG UUID BaY2tc-6r9Q-00nn-rE7D-cjsj-f5jH-r4TeIw
PE(8MBにして)を変更してボリュームグループの作成
# /usr/sbin/vgcreate -s 8M VolGroup02 /dev/sdc1 Volume group "VolGroup02" successfully created
# /usr/sbin/vgdisplay /dev/VolGroup02 --- Volume group --- VG Name VolGroup02 System ID Format lvm2 (略) VG Size 7.99 GB PE Size 8.00 MB <=8Mになっている Total PE 1023 Alloc PE / Size 0 / 0 Free PE / Size 1023 / 7.99 GB VG UUID clPzPe-MGoD-3wsG-LzVg-Lv4J-IjkC-cy9eF1
