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First, you must make sure that other partitions have enough space to allocate to the root directory /. You can view it using the following command:

$sudo df-h

As you can see, there is still a lot of free space in the home directory, so we allocate some of the home space to the root directory.

The idea of expanding the root directory is as follows:

Back up the / home folder, delete the logical volume of the / home file system, increase the logical volume of the / file system, increase the size of the / file system, and finally create a new / home directory and restore the contents of the / home folder.

Backup / home partition content

You need to choose a partition that can hold the size of the / home folder, and you can see that the remaining space of / run is 32G, so we will back up / home under / run.

$sudo tar cvf / run/home.tar / home

Uninstall / home

To terminate all processes that use the / home file system, be careful not to do the following in the / home directory:

$sudo fuser-km / home

Then, uninstall:

$sudo umount / home

Delete the logical volume lv where / home resides:

$sudo lvremove / dev/mapper/centos-home

Select y.

Expand the logical volume where the root directory is located, and here increase by 1T:

$sudo lvextend-L + 1T / dev/mapper/centos-root

7. Expansion / file system:

$sudo xfs_growfs / dev/mapper/centos-root

Logical volumes required to rebuild the / home file system:

Since we just allocated 1.0T, the logical volume created here is 2.5T in size.

$sudo lvcreate-L 2.5T-n/dev/mapper/centos-home

9. Create a file system:

$sudo mkfs.xfs / dev/mapper/centos-home

Mount the newly created file system to the / home directory:

$sudo mount / dev/mapper/centos-home

Restore the contents of the / home directory:

$sudo tar xvf / run/home.tar-C /

Delete the backup below / run:

$sudo rm-rf / run/home.tar

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Copyright notice: this article is the original article of CSDN blogger "shuai_wow", in accordance with the CC 4.0BY-SA copyright Agreement. Please attach the original source link and this statement for reprint.

Original link: https://blog.csdn.net/u013431916/article/details/80548069

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