The purpose of a file system is simply to hold data. UNIX file systems have had a fairly common evolution from their base of Berkeley Software Distribution. It was called the Berkeley Fast File System, which eventually became the UNIX industry standard known as the UNIX File System (UFS). IBM introduced its UNIX file system as the Journaled File System (JFS) with the initial release of AIX Version 3.1. It has now introduced a second file system that is to run on AIX systems called Enhanced Journaled File System (JFS2), which is available in AIX Version 5.0 and later versions. Veritas introduced the Veritas File System (VxFS) that is sold to run as a standalone product, or with Veritas Volume Manager (VxVM) or other volume managers. VxFS can optimize I/O and is designed to work with standard volume managers. JFS and JFS2 are designed to run on the AIX Logical Volume Manager (LVM) that is built into the base of the AIX operating system.
Quick Reference: AIX Journaled File Systems and Veritas File System