The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

2.2.3 Separate Disk Partitions

The National Security Agency (NSA) recommendations state that you should set up user-writable file systems such as /home, /tmp, and /var/tmp on partitions that are separate from /. In addition, /boot must be a dedicated file system if you encrypt the root file system.

For more information, see https://www.nsa.gov/ia/_files/factsheets/rhel5-pamphlet-i731.pdf.