CentOS6调整/homed到/root挂载分区大小_linux教程_开发教程

安装centos6.5使用自动推荐分区，发现一个问题/home 分区过大，超过了1.1T。

[root@localhost ~]# df -h

文件系统容量已用可用已用%% 挂载点

/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

目标：/home分20G，剩下添加给/目录下。

1.查看分区模式

[root@localhost ~]# df -h

文件系统容量已用可用已用%% 挂载点

/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.卸载挂载分区

[root@localhost ~]# umount /home

3.检查VolGroup-lv_home文件的错误性，-f 即使文件系统没有错误迹象，仍强制地检查正确性。

[root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home

e2fsck 1.41.12 (17-May-2010)

第一步: 检查inode,块,和大小

第二步: 检查目录结构

第3步: 检查目录连接性

Pass 4: Checking reference counts

第5步: 检查簇概要信息

/dev/mapper/VolGroup-lv_home: 27/69304320 files (0.0% non-contiguous), 4400705/277215232 blocks

4.调整/home为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)

正在重定位块 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Begin pass 3 (max = 8460)

正在扫描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.重新挂载并查看

[root@localhost ~]# mount /home

[root@localhost ~]# df -h

文件系统容量已用可用已用%% 挂载点

/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.划分20G外面的剩余空间。使用lvreduce指令用于减少LVM逻辑卷占用的空间大小。可能会删除逻辑卷上已有的数据，所以在操作前必须进行确认。记得输入 “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

文件系统容量已用可用已用%% 挂载点

/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”剩余空间

[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：扩展逻辑卷空间到/dev/mapper/VolGroup-lv_root目录下，也就是“/”目录下。

[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.执行操作，使之生效，中间一定要耐心等待。

[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.查看分区成功

[root@localhost ~]# df -h

文件系统容量已用可用已用%% 挂载点

/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.重启

[root@localhost ~]# shutdown -r now

(责任编辑：好模板)