CentOS逻辑卷调整分区大小

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CentOS逻辑卷调整分区大小目的

因为系统使用的是逻辑卷分区（LVM），且分区大小不合理

想增加root大小，减少home

查看磁盘使用情况

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[root@LinuxCentOS ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_linuxcentos-lv_root
                       50G  3.4G   44G   8% /
tmpfs                 3.9G   76K  3.9G   1% /dev/shm
/dev/xvda1            477M   36M  417M   8% /boot
/dev/mapper/vg_linuxcentos-lv_home
                      140G   60M  133G   1% /home
/dev/sr0              3.7G  3.7G     0 100% /media/CentOS_6.9_Final


[root@LinuxCentOS ~]# vgdisplay 
  --- Volume group ---
  VG Name               vg_linuxcentos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               199.51 GiB
  PE Size               4.00 MiB
  Total PE              51074
  Alloc PE / Size       51074 / 199.51 GiB
  Free  PE / Size       0 / 0   
  VG UUID               DqgWat-YkkU-V56r-xNFv-XmmX-mgwD-Fi0RWh

调整home分区大小

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[root@LinuxCentOS ~]# umount /home

[root@LinuxCentOS ~]# e2fsck -f /dev/mapper/vg_linuxcentos-lv_home 
e2fsck 1.41.12 (17-May-2010)
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_linuxcentos-lv_home: 11/9289728 files (0.0% non-contiguous), 631025/37148672 blocks

[root@LinuxCentOS ~]# resize2fs -p /dev/mapper/vg_linuxcentos-lv_home  20G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/vg_linuxcentos-lv_home to 5242880 (4k) blocks.
Begin pass 2 (max = 32768)
Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 1134)
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/vg_linuxcentos-lv_home is now 5242880 blocks long.

[root@LinuxCentOS ~]# mount /home

[root@LinuxCentOS ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_linuxcentos-lv_root
                       50G  3.4G   44G   8% /
tmpfs                 3.9G   76K  3.9G   1% /dev/shm
/dev/xvda1            477M   36M  417M   8% /boot
/dev/mapper/vg_linuxcentos-lv_home
                       20G   44M   19G   1% /home

释放空间

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[root@LinuxCentOS ~]# lvreduce /dev/mapper/vg_linuxcentos-lv_home -L 20G
  WARNING: Reducing active and open logical volume to 20.00 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg_linuxcentos/lv_home? [y/n]: y
  Size of logical volume vg_linuxcentos/lv_home changed from 141.71 GiB (36278 extents) to 20.00 GiB (5120 extents).
  Logical volume lv_home successfully resized.
  
  [root@LinuxCentOS ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_linuxcentos-lv_root
                       50G  3.4G   44G   8% /
tmpfs                 3.9G   76K  3.9G   1% /dev/shm
/dev/xvda1            477M   36M  417M   8% /boot
/dev/mapper/vg_linuxcentos-lv_home
                       20G   44M   19G   1% /home
                       
[root@LinuxCentOS ~]# vgdisplay 
  --- Volume group ---
  VG Name               vg_linuxcentos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               199.51 GiB
  PE Size               4.00 MiB
  Total PE              51074
  Alloc PE / Size       19916 / 77.80 GiB
  Free  PE / Size       31158 / 121.71 GiB
  VG UUID               DqgWat-YkkU-V56r-xNFv-XmmX-mgwD-Fi0RWh

增加释放的空间到root

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[root@LinuxCentOS ~]# lvextend -L +120G /dev/mapper/vg_linuxcentos-lv_root   
  Size of logical volume vg_linuxcentos/lv_root changed from 50.00 GiB (12800 extents) to 170.00 GiB (43520 extents).
  Logical volume lv_root successfully resized.
  
[root@LinuxCentOS ~]# resize2fs -p /dev/mapper/vg_linuxcentos-lv_root 
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_linuxcentos-lv_root is mounted on /; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 11
Performing an on-line resize of /dev/mapper/vg_linuxcentos-lv_root to 44564480 (4k) blocks.
The filesystem on /dev/mapper/vg_linuxcentos-lv_root is now 44564480 blocks long.

[root@LinuxCentOS ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_linuxcentos-lv_root
                      168G  3.5G  156G   3% /
tmpfs                 3.9G   76K  3.9G   1% /dev/shm
/dev/xvda1            477M   36M  417M   8% /boot
/dev/mapper/vg_linuxcentos-lv_home
                       20G   44M   19G   1% /home