Red Hat Enterprise Linux 6 provides full support for ext4 and it is the default file system for new installations. This section explains the major changes in behavior that this new file system introduces.
The included version of the GRUB boot loader provides full support for ext4 partitions. The installer also allows you to place any
/boot file system on an ext4 partition.
The included version of the e2fsprogs package is fully compatible with ext4.
In some cases, ext4 file systems created under Red Hat Enterprise Linux 5.3 with the e4fsprogs package created an
ext4dev file system type. The
test_fs feature flag identifying these file systems as a development version can be removed with the following command:
tune2fs -E ^test_fs. This is done so that these file systems will be recognized as regular ext4 file systems.