IBM introduced JFS with the initial release of AIX version 3.1 in February 1990. This file system, now called "JFS1 on AIX", was the premier file system for AIX over the following decade and was installed in thousands or millions of customers' AIX systems. Historically, the JFS1 file system is very closely tied to the memory manager of AIX, which is a typical design for a file system supporting only one operating system. JFS was one of the first file systems to support Journaling