改动/etc/fstab文件，如果挂载到/data文件夹。在最后一行加上

/dev/sdb1      /data                            ext4    defaults        1 1

最后结果例如以下：

#

# /etc/fstab

# Created by anaconda on Thu Sep 11 04:12:21 2014

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

/dev/mapper/centos-root /                       xfs     defaults        1 1

UUID=bf755645-8a3b-4222-9278-7747b8e89ce4 /boot                   xfs     defaults        1 2

/dev/mapper/centos-swap swap                    swap    defaults        0 0

/dev/sdb1      /data                            ext4    defaults        1 1

重新启动就能够自己主动挂载了