Journaled File System or JFS

A journaling file system allows for quick file system recovery after a crash occurs by logging the metadata of files.

By enabling file system logging, the system records every change in the metadata of the file into a reserved area of the file system. The actual write operations are performed after the logging of changes to the metadata has been completed.

Since JFS was created for use with the 32-bit kernel in previous releases of AIX®, it is not optimally configured for the 64-bit kernel environment. However, JFS may still be used with AIX 6.1 and later versions of 64-bit kernel environments.