### df -h 查看
[root@localhost ~]# df -h
文件系统               容量  已用  可用 已用% 挂载点
devtmpfs               1.9G     0  1.9G    0% /dev
tmpfs                  1.9G     0  1.9G    0% /dev/shm
tmpfs                  1.9G  167M  1.7G    9% /run
tmpfs                  1.9G     0  1.9G    0% /sys/fs/cgroup
/dev/mapper/nlas-root   50G  6.2G   44G   13% /
/dev/mapper/nlas-home   66G  2.4G   63G    4% /home
/dev/sda1             1014M  189M  826M   19% /boot
tmpfs                  839M     0  839M    0% /run/user/0

[root@localhost ~]# fdisk /dev/sda
欢迎使用 fdisk (util-linux 2.23.2)。

更改将停留在内存中，直到您决定将更改写入磁盘。
使用写入命令前请三思。
命令(输入 m 获取帮助)：m
命令操作
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

命令(输入 m 获取帮助)： n #new 新分区
Partition type:
  p  primary (2 primary, 1 extended, 1 free)
  l  logical (numbered from 5)
Select (default p): p #选择主分区
Selected partition 3  #分区序号
起始 扇区 (251658240-13631448799，默认为 251658240)： #分区开始回车默认
将使用默认值 251658240
Last 扇区, +扇区 or +size{K,M,G} (251658240-13631448799，默认为 13631448799)： 
将使用默认值 13631448799

Last login: Sat Nov 20 01:59:18 on ttys000
[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               nlas
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               648.99 GiB
  PE Size               4.00 MiB
  Total PE              166142
  Alloc PE / Size       30462 / 118.99 GiB
  Free  PE / Size       135680 / 530.00 GiB
  VG UUID               Ac7YMK-JWY0-2q9Y-9pun-iU9i-Wsdv-KLEkMR

### 测试大小，超出会显示错误
[root@localhost ~]# lvresize -L +600G /dev/mapper/nlas-root
  Insufficient free space: 153600 extents needed, but only 135680 available

### 正式的
[root@localhost ~]# lvresize -L +530G /dev/mapper/nlas-root
  Size of logical volume nlas/root changed from 50.00 GiB (12800 extents) to 580.00 GiB (148480 extents).
  Logical volume nlas/root successfully resized.

[root@localhost ~]# resize2fs /dev/nlas/root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block 当尝试打开 /dev/nlas/root 时
找不到有效的文件系统超级块.

[root@localhost ~]# xfs_growfs /dev/mapper/nlas-root
meta-data=/dev/mapper/nlas-root  isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 152043520

[root@localhost ~]# df -h
文件系统               容量  已用  可用 已用% 挂载点
devtmpfs               4.1G     0  4.1G    0% /dev
tmpfs                  4.1G  4.0K  4.1G    1% /dev/shm
tmpfs                  4.1G   11M  4.1G    1% /run
tmpfs                  4.1G     0  4.1G    0% /sys/fs/cgroup
/dev/mapper/nlas-root  580G   50G  531G    9% /
/dev/sda1             1014M  189M  826M   19% /boot
/dev/mapper/nlas-home   66G   38G   28G   58% /home
tmpfs                  839M     0  839M    0% /run/user/0