/etc/fstab contains information about the disks. It has the details about where the partitions and storage devices should be mounted. We usually configure automount, disk quota, mount points etc in this fstab.
Inorder to test the entries or modifications in fstab without restart the following commands will be helpful
The above command will mount all the filesystems mentioned in the fstab. This is just like a refresh command to activate the entries in fstab.
The above command will help if you don’t want to apply the modifications in the fstab and want to validate the entries only. This will just fake the entries in the fstab without applying the changes. This is a very useful command.