JFS and JFS2
The journaled file system (JFS) and the enhanced journaled file system (JFS2) are built into the base operating system. Both file system types link their file and directory data to the structure used by the AIX® Logical Volume Manager for storage and retrieval.
A difference is that JFS2 is designed to accommodate a 64-bit kernel and larger files.
The following sections describe these file systems. Unless otherwise noted, the following sections apply equally to JFS and JFS2.