What do you do when mount fails on boot in Linux?

I ran into this the other day when I deleted a filesystem and tried to reboot.  The system hangs.  The easy way to overcome this is to connect in single-user mode and edit your /etc/fstab file.  Well, you can’t do that unless / is open rw.  Use the following command to reopen / in rw so that you can edit /etc/fstab.

mount -n -o remount, rw /

Once you have edited /etc/fstab you can reboot and let the system come up normally, then fix your drives.