![[PukiWiki]](image/../localimages/Atom.gif "[PukiWiki]")
Disk2 Disk3 Disk4
---------- ----------- ----------
| | | | | |
| XXGB | | YYG | | ZZGB | 物理Disk
| | | | | |
---------- ----------- ----------
| | |
V V V
---------- ----------- ----------
| | | | | |
| sdb1 | | sdc1 | | sdd1 | 物理ボリューム(PV)
| | | | | |
---------- ----------- ----------
| | |
V V V
-----------------------------------------
| | 論理ボリュームグループ(VG)
| Volume 00 |
-----------------------------------------
| |
V V
---------------- -----------------
| | | | 論理ボリューム(LV)
| Log Vol 01 | | Log Vol 02 |
---------------- -----------------
| |
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
