我想使用LVM将/ var分离到一个单独的分区，但是我想先问一些有关它的问题。基本上，我想调整根分区的大小，以便创建一个将/ var挂载到的新分区。
我以什么顺序执行此操作，如何确保现在将数据保留在/ var中？
我具有以下具有XFS和LVM的文件系统：
Centos 7
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 36G 1.2G 35G 4% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 145M 870M 15% /boot
tmpfs 3.9G 0 3.9G 0% /tmp
/dev/mapper/centos-home 18G 46M 18G 1% /home
tmpfs 783M 0 783M 0% /run/user/1000
lsblk：
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 60G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 59G 0 part
├─centos-root 253:0 0 35.6G 0 lvm /
├─centos-swap 253:1 0 6G 0 lvm [SWAP]
└─centos-home 253:2 0 17.4G 0 lvm /home
sr0 11:0 1 1024M 0 rom
fdisk -l：
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000c0e50
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 125829119 61864960 8e Linux LVM
Disk /dev/mapper/centos-root: 38.2 GB, 38235275264 bytes, 74678272 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 6442 MB, 6442450944 bytes, 12582912 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-home: 18.7 GB, 18668847104 bytes, 36462592 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes