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    CentOS下把home空间的分出来给root的方法

    时间:2021-07-30    来源:IT资讯    人气:

    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   50G  22G  70% /

    tmpfs                 3.9G   88K 3.9G   1% /dev/shm

    /dev/sda1             485M   30M 430M   7% /boot

    /dev/mapper/VolGroup-lv_home

    20G  174M  19G   1% /home

    [root@localhost ~]# umount /home

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

    e2fsck 1.41.12 (17-May-2010)

    第1步: 检查inode,块,和大小

    第2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   50G  22G  70% /

    tmpfs                 3.9G   88K 3.9G   1% /dev/shm

    /dev/sda1             485M   30M 430M   7% /boot

    /dev/mapper/VolGroup-lv_home

    15G  170M  14G   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

    VGUUID              cxzV5u-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   50G  27G  66% /

    tmpfs                 3.9G   88K 3.9G   1% /dev/shm

    /dev/sda1             485M   30M 430M   7% /boot

    /dev/mapper/VolGroup-lv_home

    15G  170M  14G   2% /home

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