Linux(CentOS6) 調整 /home 掛載 分區大小

安裝centos6.3使用自動推薦分區，發現一個問題/home 分區過大，超過了1.1T。 目標：/home分20G，剩下添加給/目錄下。

1.查看分區模式

[root@localhost ~]# df -h 
文件系統              容量  已用  可用 已用%% 掛載點 
/dev/mapper/VolGroup-lv_root 
                       50G  2.9G   44G   7% / 
tmpfs                 5.9G  100K  5.9G   1% /dev/shm 
/dev/sda1             485M   37M  423M   8% /boot 
/dev/mapper/VolGroup-lv_home 
                      1.1T  200M  988G   1% /home 

2.卸載掛載分區

[root@localhost ~]# umount /home 

3.檢查VolGroup-lv_home文件的錯誤性，-f   即使文件系統沒有錯誤跡象，仍強制地檢查正確性。

[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home 
e2fsck 1.41.12 (17-May-2010) 
第一步: 檢查inode,塊,和大小 
第二步: 檢查目錄結構 
第3步: 檢查目錄連接性 
Pass 4: Checking reference counts 
第5步: 檢查簇概要信息 
/dev/mapper/VolGroup-lv_home: 27/69304320 files (0.0% non-contiguous), 4400705/277215232 blocks 

4.調整/home爲20G，

[root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G 
resize2fs 1.41.12 (17-May-2010) 
Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks. 
Begin pass 2 (max = 32784) 
正在重定位塊            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
Begin pass 3 (max = 8460) 
正在掃描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
Begin pass 4 (max = 15) 
正在更新inode引用       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long. 

5.重新掛載並查看

[root@localhost ~]# mount /home 
[root@localhost ~]# df -h 
文件系統              容量  已用  可用 已用%% 掛載點 
/dev/mapper/VolGroup-lv_root 
                       50G  2.9G   44G   7% / 
tmpfs                 5.9G  100K  5.9G   1% /dev/shm 
/dev/sda1             485M   37M  423M   8% /boot 
/dev/mapper/VolGroup-lv_home 
                       20G  172M   19G   1% /home 

6.劃分20G外面的剩餘空間。使用lvreduce指令用於減少LVM邏輯卷佔用的空間大小。可能會刪除邏輯捲上已有的數據，所以在操作前必須進行確認。記得輸入 “y”

[root@localhost ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home 
  WARNING: Reducing active and open logical volume to 20.00 GiB 
  THIS MAY DESTROY YOUR DATA (filesystem etc.) 
Do you really want to reduce lv_home? [y/n]: y 
  Reducing logical volume lv_home to 20.00 GiB 
  Logical volume lv_home successfully resized 

[root@localhost ~]# df -h 
文件系統              容量  已用  可用 已用%% 掛載點 
/dev/mapper/VolGroup-lv_root 
                       50G  2.9G   44G   7% / 
tmpfs                 5.9G  100K  5.9G   1% /dev/shm 
/dev/sda1             485M   37M  423M   8% /boot 
/dev/mapper/VolGroup-lv_home 
                       20G  172M   19G   1% /home 

7.查看“Free  PE / Size”剩餘空間

[root@localhost ~]# vgdisplay 
  --- Volume group --- 
  VG Name               VolGroup 
  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               1.09 TiB 
  PE Size               4.00 MiB 
  Total PE              285022 
  Alloc PE / Size       19424 / 75.88 GiB 
  Free  PE / Size       265598 / 1.01 TiB 
  VG UUID               nSbflh-J7fN-xDvf-zLjL-tFcu-Y5Tm-ybnDk0 

8.使用lvextend指令：擴展邏輯卷空間到/dev/mapper/VolGroup-lv_root目錄下，也就是“/”目錄下。

[root@localhost ~]# lvextend -L +1.01T /dev/mapper/VolGroup-lv_root 
  Rounding size to boundary between physical extents: 1.01 TiB 
  Extending logical volume lv_root to 1.06 TiB 
  Logical volume lv_root successfully resized

9.執行操作，使之生效，中間一定要耐心等待。

[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 = 68 
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 284227584 (4k) blocks. 
The filesystem on /dev/mapper/VolGroup-lv_root is now 284227584 blocks long. 

10.查看分區成功

[root@localhost ~]# df -h 
文件系統              容量  已用  可用 已用%% 掛載點 
/dev/mapper/VolGroup-lv_root 
                      1.1T  2.9G 1011G   1% / 
tmpfs                 5.9G  100K  5.9G   1% /dev/shm 
/dev/sda1             485M   37M  423M   8% /boot 
/dev/mapper/VolGroup-lv_home 
                       20G  172M   19G   1% /home 

11.重啓

[root@localhost ~]# shutdown -r now 

轉載：http://www.07net01.com/security/Linux_CentOS6__diaozheng__home_guazai_fenqudaxiao_54712_1358334113.html
參考：http://blog.163.com/ziye_1008@126/blog/static/20214506201261691319242/