Red Hat ENTERPRISE LINUX 5 - GLOBAL FILE SYSTEM 2 Manual page 16

Chapter 1. GFS2 Overview
• GFS2 uses less kernel memory
• GFS2 requires no metadata generation numbers.
Allocating GFS2 metadata does not require reads. Copies of metadata blocks in multiple journals
are managed by revoking blocks from the journal before lock release.
• GFS2 includes a much simpler log manager that knows nothing about unlinked inodes or quota
changes.
• The gfs2_grow and gfs2_jadd commands use locking to prevent multiple instances running at
the same time.
• The ACL code has been simplified for calls like creat() and mkdir().
• Unlinked inodes, quota changes, and statfs changes are recovered without remounting the
journal.
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