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LVMの縮小

LVM(default install LVM)のサイズとHDDのパーティションサイズを縮小します。オンラインでは縮小できないので、Live CDで起動する。
  1. LVMをアクティブにする。
    2. [root@server]# lvm vgchange -a y
  2 logical volume(s) in volume group "vg_leom" now active
  2. Filesystemのチェック
    3. [root@server]# fsck -fc /dev/vg_leom/lv_root
fsck from util-linux-ng 2.17.2
e2fsck 1.41.10 (10-Feb-2009)
Checking for bad blocks (read-only test): done                                
/dev/mapper/vg_leom-lv_root: Updating bad block inode.
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/mapper/vg_leom-lv_root: ***** FILE SYSTEM WAS MODIFIED *****
/dev/mapper/vg_leom-lv_root: 229264/7208960 files (0.9% non-contiguous), 9017188/28835840 blocks
  3. Filesystemのリサイズ
    4. [root@server]# resize2fs -p /dev/vg_leom/lv_root 100G
resize2fs 1.41.10 (10-Feb-2009)
Resizing the filesystem on /dev/vg_leom/lv_root to 26214400 (4k) blocks.
Begin pass 2 (max = 543469)
Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 880)
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 28093)
Updating inode references     XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/vg_leom/lv_root is now 26214400 blocks long.
  4. Logical volumeのリサイズ
    5. [root@server]# lvm lvresize /dev/vg_leom/lv_root --size 100G
  WARNING: Reducing active logical volume to 100.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_root? [y/n]: y
  Reducing logical volume lv_root to 100.00 GiB
  Logical volume lv_root successfully resized
  5. Physical volumeのリサイズ
    6. [root@server]# lvm pvresize /dev/sda2 --setphysicalvolumesize 100G
  /dev/sda2: cannot resize to 25599 extents as 26104 are allocated.
  0 physical volume(s) resized / 1 physical volume(s) not resized
    リサイズできていない
    [root@server]# lvm pvresize /dev/sda2 --setphysicalvolumesize 101G
  /dev/sda2: cannot resize to 25855 extents as 26104 are allocated.
  0 physical volume(s) resized / 1 physical volume(s) not resized
    リサイズできていない
    [root@server]# lvm pvresize /dev/sda2 --setphysicalvolumesize 102G
  Physical volume "/dev/sda2" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized
    リサイズ成功
  6. fdiskコマンドでパーティションサイズを変更する
    7. [root@server]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): d
Partition number (1-4): 2

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (26-60801, default 26): 
Using default value 26
Last cylinder, +cylinders or +size{K,M,G} (26-60801, default 60801): +102G

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Linux LVM)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
  7. Physical volumeの確認とリサイズ
    8. [root@server]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_leom
  PV Size               120.00 GiB / not usable 3.81 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              30719
  Free PE               4615
  Allocated PE          26104
  PV UUID               eXmCVb-Om8g-06LC-WABT-bk5l-ADce-krBIUA
    「PV Size」が120Gのままで、リサイズできていない
    [root@server]# pvresize /dev/sda2 100G
  Physical volume "/dev/sda2" changed
  Failed to read physical volume "100G"
  1 physical volume(s) resized / 0 physical volume(s) not resized

    [root@server]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_leom
  PV Size               102.00 GiB / not usable 1.76 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              26112
  Free PE               8
  Allocated PE          26104
  PV UUID               eXmCVb-Om8g-06LC-WABT-bk5l-ADce-krBIUA
    リサイズ成功
  8. 最後にFilesystemのチェック
    9. [root@server]# fsck -fc /dev/vg_leom/lv_root
fsck from util-linux-ng 2.17.2
e2fsck 1.41.10 (10-Feb-2009)
Checking for bad blocks (read-only test): done                                
/dev/mapper/vg_leom-lv_root: Updating bad block inode.
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/mapper/vg_leom-lv_root: ***** FILE SYSTEM WAS MODIFIED *****
/dev/mapper/vg_leom-lv_root: 229286/6553600 files (0.9% non-contiguous), 8976966/26214400 blocks
    Logical volumeのサイズを120Gから100Gに変更するするつもりが、結果的に102Gに変更することにした。