cp /etc/fstab /etc/fstab.bak

echo /dev/vdb1 /mnt/disk1 ext4 defaults 0 0 >> /etc/fstab

mkdir -p /mnt/disk1

mount /dev/vdb1 /mnt/disk1

echo "hello world" >> /mnt/disk1/readme

cat /mnt/disk1/readme

hello world

[root@tbari-sh1 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/vda1 50G 1.4G 46G 3% /

devtmpfs 16G 0 16G 0% /dev

tmpfs 16G 0 16G 0% /dev/shm

tmpfs 16G 332K 16G 1% /run

tmpfs 16G 0 16G 0% /sys/fs/cgroup

tmpfs 3.2G 0 3.2G 0% /run/user/0

/dev/vdb1 99G 61M 94G 1% /mnt/disk1