CentOS 6.9 移除 home lv 并扩展 root lv

Jan 16, 2018

问题

CentOS 6.9 minimal 按默认安装好后：

# df -h

    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root   50G  687M   46G   2% /
    tmpfs                          32G     0   32G   0% /dev/shm
    /dev/md126p2                  477M   27M  425M   6% /boot
    /dev/md126p1                  200M  264K  200M   1% /boot/efi
    /dev/mapper/VolGroup-lv_home  790G   69M  750G   1% /home

空余空间都在 home lv 上，如何把空间扩展到 root lv 上？

移除 home lv

# umount /home
# lvchange -an /dev/VolGroup/lv_home
# lvremove /dev/VolGroup/lv_home
# vi /etc/fstab

    /dev/mapper/VolGroup-lv_home /home               ext4    defaults        1 2
    # dd 这一行

扩展 root lv

# lvextend -l +100%FREE /dev/VolGroup/lv_root
    Size of logical volume VolGroup/lv_root changed from 50.00 GiB (12800 extents)
    to 852.69 GiB (218289 extents).
    Logical volume lv_root successfully resized.

# lvdisplay

# resize2fs -p /dev/VolGroup/lv_root
    resize2fs 1.41.12 (17-May-2010)
    Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required
    old desc_blocks = 4, new_desc_blocks = 54
    Performing an on-line resize of /dev/VolGroup/lv_root to 223527936 (4k) blocks.
    The filesystem on /dev/VolGroup/lv_root is now 223527936 blocks long.

# df -h
    Filesystem                      Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root    840G  707M  796G   1% /
    tmpfs                            32G     0   32G   0% /dev/shm
    /dev/md126p2                    477M   27M  425M   6% /boot
    /dev/md126p1                    200M  264K  200M   1% /boot/efi

# reboot

根据磁盘大小命令 resize2fs 可能会需要很长时间，800G大概需要20分钟，请有耐心一些。

如果有别的办法可以快一些，敬请留言，谢谢！

https://huntout.github.io/2018/01/16/extend-centos-root-logic-volume/

centos