CentOS下把home空间的分出来给root

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下面的操作是通过实际操作完成的。

下面的例子尝试吧home空间的20G中的5G分出来给root空间

[root@localhost ~]# df -h

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/VolGroup-lv_root

75G 50G22G 70% /

tmpfs 3.9G 88K3.9G 1% /dev/shm

/dev/sda1 485M 30M430M 7% /boot

/dev/mapper/VolGroup-lv_home

20G 174M19G 1% /home

[root@localhost ~]# umount /home

[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: 158/1310720files (0.0% non-contiguous), 126581/5242880 blocks

[root@localhost ~]# resize2fs -p/dev/mapper/VolGroup-lv_home 15G

resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on/dev/mapper/VolGroup-lv_home to 3932160 (4k) blocks.

Begin pass 3 (max = 160)

正在扫描inode表XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

The filesystem on/dev/mapper/VolGroup-lv_home is now 3932160 blocks long.

[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

75G 50G22G 70% /

tmpfs 3.9G 88K3.9G 1% /dev/shm

/dev/sda1 485M 30M430M 7% /boot

/dev/mapper/VolGroup-lv_home

15G 170M14G 2% /home

[root@localhost ~]# lvreduce -L 15G /dev/mapper/VolGroup-lv_home

WARNING: Reducing active and open logical volume to 15.00 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 15.00 GiB

Logical volume lv_home successfully resized

[root@localhost ~]# vgdisplay

---Volume group ---

VGName VolGroup

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 7

VGAccess read/write

VGStatus resizable

MAXLV 0

CurLV 3

Open LV 3

MaxPV 0

CurPV 1

ActPV 1

VGSize 99.51 GiB

PESize 4.00 MiB

Total PE 25474

Alloc PE / Size 24194 /94.51 GiB

Free PE / Size 1280 / 5.00 GiB

VGUUIDcxzV5u-cG1f-HvPd-pE8c-eKrR-dBjN-H07k3I

[root@localhost ~]# lvextend -L +5.00G/dev/mapper/VolGroup-lv_root

Extending logical volume lv_root to 80.57 GiB

Logical volume lv_root successfully resized

[root@localhost ~]# resize2fs -p/dev/mapper/VolGroup-lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/VolGroup-lv_rootis mounted on /; on-line resizing required

old desc_blocks = 5, new_desc_blocks = 6

Performing an on-line resize of/dev/mapper/VolGroup-lv_root to 21121024 (4k) blocks.

The filesystem on/dev/mapper/VolGroup-lv_root is now 21121024 blocks long.

[root@localhost ~]# df -h

文件系统 容量 已用 可用 已用%% 挂载点

/dev/mapper/VolGroup-lv_root

80G 50G27G 66% /

tmpfs 3.9G 88K3.9G 1% /dev/shm

/dev/sda1 485M 30M430M 7% /boot

/dev/mapper/VolGroup-lv_home

15G 170M14G 2% /home

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