[root@backup binlog]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  8
  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               2.73 TiB
  PE Size               4.00 MiB
  Total PE              715273
  Alloc PE / Size       712822 / 2.72 TiB
  Free  PE / Size       2451 / 9.57 GiB
  VG UUID               6rIzMZ-cqff-oWy6-0EvS-YENe-37U9-65SunU


[root@backup binlog]# lvextend -L +4G /dev/mapper/centos-home
  Size of logical volume centos/home changed from 2.66 TiB (697542 extents) to 2.66 TiB (698566 extents).
  Logical volume home successfully resized.

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

确认文件系统是xfs:
[root@backup binlog]# cat /etc/fstab | grep centos-home
/dev/mapper/centos-home /home                   xfs     defaults        0 0

xfs用以下命令来扩磁盘空间:
[root@backup binlog]# xfs_growfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=256    agcount=6, agsize=118277632 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=709040128, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=231011, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 709040128 to 715331584