yum -y install xfsdump

xfsdump -f /tmp/home.dump /home

fuser -km /home

umount /home

-

lvremove /dev/mapper/almalinux_192-home

-

lvcreate -L 1G almalinux_192 -n home

-将/home的Logical Volume缩减到5GB

lvreduce -L 5G /dev/mapper/almalinux_192-home

-将/home的Logical Volume缩减5GB

lvreduce -L -5G /dev/mapper/almalinux_192-home

-增加/dev/mapper/centos-root的空间大小

lvextend -l +100%FREE /dev/mapper/almalinux_192-root

xfs_growfs  /dev/mapper/almalinux_192-root

blkid

mkfs.xfs -f /dev/mapper/almalinux_192-home

mount /home /dev/mapper/almalinux_192-home   #重新挂载

xfsrestore -f /tmp/home.dump  /home

vgdisplay