一、目的
在使用CentOS6.3版本Linux系統的時候，發現根目錄(/)的空間不是很充足，而其他目錄空間有很大的空閒，所以本文主要是針對現在已有的空間進行調整。首先，先來查看一下系統的空間分配情況：
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root
50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
/dev/mapper/vg_centos-lv_home
404G 670M 382G 1% /home
下面的詳細步驟部分將從vg_centos-lv_home分區下取出100G的空間添加到/vg_centos-lv_root分區上去。
二、詳細步驟
1、卸載vg_centos-lv_home分區
[root@CentOS-78 /]# umount /home
此時在用df命令查看將會發現/home目錄已經看不見了，如下所示：
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root
50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
2、從新設定vg_home-lv_home的大小
[root@CentOS-78 /]# resize2fs -p /dev/mapper/vg_centos-lv_home 282G
resize2fs 1.41.12 (17-May-2010)
Please run 'e2fsck -f /dev/mapper/vg_centos-lv_home' first.
這一步設定vg_home-lv_home大小沒有成功，系統提示我們先運行下面的命令，操作如下：
[root@CentOS-78 /]# e2fsck -f /dev/mapper/vg_centos-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_centos-lv_home: 1386/26836992 files (0.9% non-contiguous), 1855856/107344896 blocks
重新設定vg_home-lv_home的大小：
[root@CentOS-78 /]# resize2fs -p /dev/mapper/vg_centos-lv_home 282G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/vg_centos-lv_home to 73924608 (4k) blocks.
Begin pass 2 (max = 43)
Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 3276)
Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 266)
Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/vg_centos-lv_home is now 73924608 blocks long.
檢查是否成功：
[root@CentOS-78 /]# mount /home
[root@CentOS-78 /]#
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root
50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
/dev/mapper/vg_centos-lv_home
278G 663M 263G 1% /home
[root@CentOS-78 /]#
