論理ボリューム追加

最終更新日： 2017.05.24

[root@centos ~]# vgdisplay　←　VG照会
  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               4.84 GB
  PE Size               32.00 MB
  Total PE              155
  Alloc PE / Size       124 / 3.88 GB
  Free  PE / Size       31 / 992.00 MB　←　VGに空き(992MB)あり
  VG UUID               9wGRk1-6iy1-03Hi-BX2b-W8u8-saiV-P6wfiL

[root@centos ~]# lvcreate -L 992M /dev/VolGroup00　←　VGの空き全て(PE Size(32MB)×Free PE(31)=992MB)を使用してLV作成
  Logical volume "lvol0" created

[root@centos ~]# lvdisplay　←　LV照会
  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                H37kZ2-u6pm-mwul-k7Wr-MBfg-Mh3T-4sOg8M
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.38 GB
  Current LE             108
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                YBWq23-hqGZ-1atm-NiKl-T8QL-yr8o-ZjEeAa
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                512.00 MB
  Current LE             16
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

−−作成したLVの情報(ここから)−−
  --- Logical volume ---
  LV Name                /dev/VolGroup00/lvol0
  VG Name                VolGroup00
  LV UUID                N2LSlX-mRFG-IT0T-WzRj-RE7J-c6g9-mR5DP4
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                992.00 MB
  Current LE             31
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
−−作成したLVの情報(ここまで)−−

[root@centos ~]# mkfs -t ext3 /dev/VolGroup00/lvol0　←　作成したLVへファイルシステム作成
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
126976 inodes, 253952 blocks
12697 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=260046848
8 block groups
32768 blocks per group, 32768 fragments per group
15872 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376

Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 22 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root@centos ~]# mount /dev/VolGroup00/lvol0 /mnt　←　追加したLVを/mntへマウント

[root@centos ~]# df　←　マウント状況照会
Filesystem           1K-ブロック    使用   使用可 使用% マウント位置
/dev/mapper/VolGroup00-LogVol00
                       3428080   1667868   1583268  52% /
/dev/sda1               101086     23800     72067  25% /boot
tmpfs                   127796         0    127796   0% /dev/shm
/dev/mapper/VolGroup00-lvol0
                        999764     18780    930200   2% /mnt　←　/mntへマウントされたLV

[root@centos ~]# echo /dev/VolGroup00/lvol0 /mnt ext3 defaults 1 1 >> /etc/fstab　←　システム起動時自動マウント設定