reference:
https://blog.csdn.net/evandeng2009/article/details/49814097
The main command:
CD 15/ 16 LL . 17 mkdir Backup 18 is LL 20 is -R & lt CP / home / * / Backup / # backup / home directory to / Backup 21 is CD / home / 22 is LL 26 is CD / 27 CD Backup / 30 LL 31 is CD / 32 LL umount 33 is / home 34 is W 35 reboot 36 W 37 [umount / home associated with this unloading # / home mount 38 is -H DF 39 the lvremove / dev / CentOS / home delete the logical volume # Home 40 # See the vgdisplay volume group free space 41 lvcreate -L 200G -n home centos # -L represents the size of the default unit is M; -n represents a volume name; CentOS7 CentOS here is the installation of the system on the established default volume group 42 lvdisplay # logical view Home 43 is the vgdisplay 44 df -h 45 vgchange -ay centos # optional steps of: activating the volume group centos, such that the entry into force of the new home logical 46 mkfs -t xfs / dev / centos / home # xfs file system on the establishment of the new home logical file before 47 mount / dev / centos / home / home / # this new logical volume linked to the home folder / home in go directly to mount also restart with fstab line 48 DF -H 49 -R & lt CP / Backup / * / home / # copy then copied back out before something new / home in 50 CD / home / 53 is LL 54 is CD / 55 LL 56 the lvextend -L + 200G / dev / CentOS / root # to release the extra space allocated to the root volume; + sign indicates that the additional basis of the original, do not add the specific amount set is good, the rest slag slag that point it idle space 57 is -H DF 58 the lvdisplay 59 -ay the vgchange CentOS 60 -H DF 61 is xfs_growfs / dev / CentOS / # root root volume expansion, xfs_growfs extended file system. Do not use xfs_growfs extended file system, the disk is not know much space 62 df -h # Look at the size of the root is already in force, the more than 200 G