RHEL7 install

When I install RHEL 7 using hard drive it is going to emergency mode and reporting /dev/root is missing.

In RHEL 6 there is a need of "install.img and product.img must be the only files in the images/ directory along with the ISO file. However not sure if any such things required here with RHEL 7 install.

Kindly suggest.

[ 14.432764] dracut-initqueue[580]: Warning: no suitable images
[FAILED] Failed to start Switch Root.

See 'systemctl status initrd-switch-root.service' for details.

Warning: /dev/root does not exist

Generating "/run/initramfs/rdsosreport.txt"

Entering emergency mode. Exit the shell to continue.

Type "journalctl" to view system logs.

You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot after mounting them and attach it to a bug report