Centos7 adjusts LVM size of XFS format

The following column centos Getting Started Tutorial will introduce to you how to adjust the LVM size of XFS format in centos7. I hope it will be helpful to friends in need!

Premise: XFS is the pre-installed operating system of centos7. XFS can only be expanded but not reduced, so you need to use the xfsdump / xfsrestore tool to back up and Restore data.

The results of this experiment are:

1, /dev/mapper/centos-home only retains 500G;

2, allocate the space separated from /home to / dev/mapper/centos-root.

The original space size is as shown below:

#step1: Install xfsdump package

yum -y install xfsdump

step2: Back up /home

 xfsdump -f /home.xfsdump /homeplease enter label for this dump session (timeout in 300 sec)-> homeplease enter label for media in drive 0 (timeout in 300 sec)-> home

step3: Reduce the size of /dev/mapper/centos-home

Uninstall /home

# umount /home

Reduce the Logical Volume of /home to 5GB

# lvreduce -L 5G /dev/mapper/centos-homeDo you really want to reduce home? [y/n]: y

step4: Increase / Space size of dev/mapper/centos-root

# lvextend -l +100%FREE /dev/centos/root

Extend xfs space

# xfs_growfs /dev/centos/root

step5: Restore the contents of /home

Format the lvm of /home

# mkfs.xfs -f /dev/mapper/centos-home

Mount /home /dev/mapper/centos-home

# mount /home

Restore backup data to /home

# xfsrestore -f /home.xfsdump /home

The adjusted space size is as shown below:

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