JFS OverView

Hi all,

JFS – Journaling File system
Journeling- automatic recovery

IBM released this file system while the release of AIX

JFS Features


The journal can be up to 128MB
JFS journals metadata only, which means that metadata will remain consistent

but user files may be corrupted after a crash or power loss. JFS’ journaling is similar to XFS

where it only journals parts of the inode

B+ Tree
JFS uses B+ tree directory structure in looking for directories

Dynamic Inode Allocation
The memory allocates dynamically for inode


Concurrent Input / Output (CIO)

Allocation Groups

JFS Superblocks

Use Google to know it


About Navaneethan

mixed feelings...
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