**LVMの操作 [#rd7c7df4]

RIGHT:更新日 &lastmod();



     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

***物理ボリュームの作成 [#r1c9aed2]

 # /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

***物理ボリュームの作成 [#v230b637]

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]


***ボリュームグループの作成 [#wc95adf8]

 # /usr/sbin/vgcreate VolGroup01 /dev/sdb1 /dev/sdc1 /dev/sde1
   Volume group "VolGroup01" successfully created


***ボリュームグループの確認 [#s7116984]

 # /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

***ボリュームグループの削除 [#v78259d8]

 # /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。

***論理ボリュームの作成 [#k48cdce2]

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

***論理ボリュームの確認 [#l886aeed]

 # /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

***論理ボリュームの削除 [#e19b65ad]

 # /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

***論理ボリュームのフォーマット [#g92970cb]

 # /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)



**LVの拡大/縮小 [#e19dc0ad]

***LVのサイズ拡大 [#v1428ee9]

 # /usr/sbin/lvextend -L +1024M /dev/VolGroup01/LogVol11
   Extending logical volume LogVol11 to 8.00 GB
   Logical volume LogVol11 successfully resized

***FileSystemの拡大(ext3/ext4) [#ibead5f9]

 # /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

***LVのサイズ縮小 [#oce3dd4d]

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.

***LVのサイズ縮小(-2GB) [#aa47800e]
 # /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
**VGの追加・削減 [#v543040c]
**VGにPV追加・切り離し [#v543040c]

***ボリュームグループ(VolGroup01:24GB)に物理ボリューム(sdf:4GB)を追加 [#t860da07]

 # /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


***ボリュームグループから物理ボリュームを切り離し [#x870149c]

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


**Raid1 [#ee4de1b2]

Raid1を作成後、ボリュームグループの作成 する例

Raid1デバイス(/dev/md0)を/dev/xvdg1,/dev/xvdh1から作成
 # /sbin/mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/xvdg1 /dev/xvdh1
 mdadm: /dev/xvdg1 appears to contain an ext2fs file system
     size=987964K  mtime=Thu Jan  1 09:00:00 1970
 mdadm: /dev/xvdh1 appears to contain an ext2fs file system
     size=987964K  mtime=Thu Jan  1 09:00:00 1970
 Continue creating array? y
 mdadm: array /dev/md0 started.

 # /sbin/mdadm --detail --scan >> /etc/mdadm.conf

物理ボリュームとして初期化

 # /usr/sbin/pvcreate  /dev/md0
   Physical volume "/dev/md0" successfully created

ボリュームグループの作成

 # /usr/sbin/vgcreate VolGroup03 /dev/md0
   Volume group "VolGroup03" successfully created

論理ボリュームの作成
 # /usr/sbin/lvcreate -L 960M -n LogVol_raid01 VolGroup03
   Logical volume "LogVol_raid01" created

Format後、/mnt-raidにmount

 # /sbin/mkfs -t ext3 /dev/VolGroup03/LogVol_raid01
 # mkdir /mnt-raid
 # mount /dev/VolGroup03/LogVol_raid01 /mnt-raid



**参考 [#g5a4b357]

-https://www.miraclelinux.com/technet/document/linux/training/2_2_3.html#training2_2_3_1
http://pantora.net/pages/linux/lvm/3/

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