JFS File System, properties

• A file system is called Journalised File System because the VG keeps a LOG of the modifications on a particular LV (jfslog) acting like a “redolog”.

• The jfslog is replayed in case of a crash (super-block marked dirty) when the FS is mounted again.

• A FS can be unmounted only if no processes have opened any file (ie: fuser -xcu /a15jfs ) or have used a subdirectory as the current directory (pwd) (fuser -fcu …)

• The FAT characteristics can be set-up only at creation time (nb inode versus max size of an inode)

Previous Slide

Next Slide

Come back to First Slide

See graphical version