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[root@localhost /]# umount /opt
umount: /opt: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
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[root@localhost /]# umount /opt -f
umount2: É豸»ò×ÊԴæ
umount: /opt: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
umount2: É豸»ò×ÊԴæ
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[root@localhost /]# fuser -m /opt
/opt:               189688c189820c190111c190117c
#ɱµô
[root@localhost /]# kill -9 189688 189820 190111 190117
[root@localhost /]# fuser -m /opt
[root@localhost /]# umount /opt
#mke2fs: inodeÊýÁ¿Ð¡ÓÚ 2^32 = 4294967296
[root@localhost /]# mke2fs -O 64bit,has_journal,extents,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize -i 4194304 /dev/sdb -N 4294967295
mke2fs 1.43.3 (04-Sep-2016)
 /dev/sdb ÓÐÒ»¸ö ext4 Îļþϵͳ
 
´´½¨º¬ÓÐ 7324216320 ¸ö¿é£¨Ã¿¿é 4k£©ºÍ 4291545600 ¸öinodeµÄÎļþϵͳ
ÎļþϵͳUUID£ºdb805a53-64a2-46d4-9f92-38e97c99e092
³¬¼¶¿éµÄ±¸·Ý´æ´¢ÓÚÏÂÁп飺 
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
        102400000, 214990848, 512000000, 550731776, 644972544, 1934917632, 
        2560000000, 3855122432, 5804752896

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[root@localhost /]# mkdir /opt/disk
[root@localhost /]# chown -R nwom:nwom /opt/disk
[root@localhost /]# vi /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Thu Sep  1 21:10:23 2016
#
# 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/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=472161e5-934c-4fe0-8a0c-8108c6504287 /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_home /home                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/sdb                /opt                    ext4    defaults        1 2
[root@localhost /]# mount /dev/sdb /opt/disk
[root@localhost /]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root   50G  4.6G   43G  10% /
tmpfs                          48G  228K   48G   1% /dev/shm
/dev/sda1                     485M   40M  420M   9% /boot
/dev/mapper/VolGroup-lv_home  221G   13G  198G   6% /home
/dev/sdb                       27T  1.1G   25T   1% /opt
[root@localhost /]# df -ia
Filesystem                       Inodes  IUsed      IFree IUse% Mounted on
/dev/mapper/VolGroup-lv_root    3276800 115048    3161752    4% /
proc                                  0      0          0     - /proc
sysfs                                 0      0          0     - /sys
devpts                                0      0          0     - /dev/pts
tmpfs                          12376269      6   12376263    1% /dev/shm
/dev/sda1                        128016     39     127977    1% /boot
/dev/mapper/VolGroup-lv_home   14680064  40378   14639686    1% /home
none                                  0      0          0     - /proc/sys/fs/binfmt_misc
gvfs-fuse-daemon                      0      0          0     - /root/.gvfs
/dev/sdb                     4291545600     11 4291545589    1% /opt