[root@test etc]# fdisk -l
Disk /dev/sdb: 256.1 GB, 256060514304 bytes, 500118192 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: 0x00085ecd
Device Boot Start End Blocks Id System
/dev/sdb1 2048 500117503 250057728 83 Linux
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x0009f1b1
Device Boot Start End Blocks Id System
/dev/sdc1 2048 3907028991 1953513472 83 Linux
Disk /dev/sda: 256.1 GB, 256060514304 bytes, 500118192 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: 0x0001e6f8
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 466563071 232231936 83 Linux
/dev/sda3 466563072 500117503 16777216 82 Linux swap / Solaris
[root@test etc]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 16359468 0 16359468 0% /dev
tmpfs 16369908 0 16369908 0% /dev/shm
tmpfs 16369908 115444 16254464 1% /run
tmpfs 16369908 0 16369908 0% /sys/fs/cgroup
/dev/sda2 228455892 6355972 210471940 3% /
/dev/sdb1 246002848 60572 233423008 1% /backup1
/dev/sda1 999320 147456 783052 16% /boot
/dev/sdc1 1922728752 6486828 1818549868 1% /backup2
tmpfs 3273984 0 3273984 0% /run/user/0
[root@test etc]# vi /etc/fstab
[root@test etc]# umount /dev/sdc1
[root@test etc]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 16359468 0 16359468 0% /dev
tmpfs 16369908 0 16369908 0% /dev/shm
tmpfs 16369908 115444 16254464 1% /run
tmpfs 16369908 0 16369908 0% /sys/fs/cgroup
/dev/sda2 228455892 6355988 210471924 3% /
/dev/sdb1 246002848 60572 233423008 1% /backup1
/dev/sda1 999320 147456 783052 16% /boot
tmpfs 3273984 0 3273984 0% /run/user/0
[root@test etc]# mount /dev/sdc1 /app
mount: mount point /app does not exist
[root@test etc]# cd /
[root@test /]# mkdir app
[root@test /]# mount /dev/sdc1 /app