同时调整lv分区的大小（减少一个，增加另一个）

author：headsen chen

date： 2018-04-20  16:48:06

1、查看分区：/home 为67G,太大了，/ 是50g,太小了。
[root@localhost ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G  1.5G   46G   4% /
tmpfs                 495M     0  495M   0% /dev/shm
/dev/sda1             477M   36M  416M   8% /boot
/dev/mapper/VolGroup-lv_home
                       67G   52M   63G   1% /home

2，先卸载/home 分区
[root@localhost ~]# umount /home

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G  1.5G   46G   4% /
tmpfs                 495M     0  495M   0% /dev/shm
/dev/sda1             477M   36M  416M   8% /boot

3，减少lv_home的逻辑卷大小调整为10G
[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-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/VolGroup-lv_home: 11/4431872 files (0.0% non-contiguous), 324173/17713152 blocks

[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 10G

resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 2621440 (4k) blocks.
Begin pass 2 (max = 32768)
Relocating blocks             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 541)
Scanning inode table          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/VolGroup-lv_home is now 2621440 blocks long.

　 4，重新挂载/home分区

[root@localhost ~]# mount /home
[root@localhost ~]# df -h

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G  1.5G   46G   4% /
tmpfs                 495M     0  495M   0% /dev/shm
/dev/sda1             477M   36M  416M   8% /boot
/dev/mapper/VolGroup-lv_home
                      9.8G   36M  9.2G   1% /home

[root@localhost ~]# ls /home
lost+found
[root@localhost ~]# vgs

  VG       #PV #LV #SN Attr   VSize   VFree
  VolGroup   1   3   0 wz--n- 119.51g    0
[root@localhost ~]# lvs
  LV      VG       Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_home VolGroup -wi-ao---- 67.57g
  lv_root VolGroup -wi-ao---- 50.00g
  lv_swap VolGroup -wi-ao----  1.94g       

5，在逻辑卷里面减少lv的大小

[root@localhost ~]# lvreduce -L -51G /dev/VolGroup/lv_home

  WARNING: Reducing active and open logical volume to 16.57 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? [y/n]: y
  Size of logical volume VolGroup/lv_home changed from 67.57 GiB (17298 extents) to 16.57 GiB (4242 extents).
  Logical volume lv_home successfully resized

[root@localhost ~]# lvs

  LV      VG       Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv_home VolGroup -wi-ao---- 16.57g
  lv_root VolGroup -wi-ao---- 50.00g
  lv_swap VolGroup -wi-ao----  1.94g           

[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize   VFree
  VolGroup          wz--n- .51g .00g

6，增加lv_root的lv
[root@localhost ~]# lvextend -L +50G /dev/VolGroup/lv_root
  Size of logical volume VolGroup/lv_root changed from 50.00 GiB ( extents) to 100.00 GiB ( extents).
  Logical volume lv_root successfully resized

7,使文件系统重新扫描lv,使修改立即生效。
[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_root

resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 7
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 26214400 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 26214400 blocks long.

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       99G  .5G   92G   % /
tmpfs                 495M       495M   % /dev/shm
/dev/sda1             477M   36M  416M   % /boot
/dev/mapper/VolGroup-lv_home
                      .8G   36M  .2G   % /home
[root@localhost ~]#