Hello,

I just created a new 3TB ext4 filesystem on a RHEL 5.6 server, simply 
using "mke4fs <device>".

When I look a the resulting file system options, I see this:
Filesystem features:
   ext_attr resize_inode dir_index filetype sparse_super large_file

But when I look at the file system features of the root file system of a 
RHEL 6 installation, I get the following features:
  has_journal ext_attr resize_inode dir_index filetype needs_recovery 
extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink 
extra_isize

Does mke4fs really create file systems without journals and extents? If 
so: What's the point of having a special mke4fs command?

When I create a new ext4 file system the next time, which of the 
following features should I include (which seem to be chosen by RHEL6's 
installer), apart from making sure that a journal is being used:
 - flex_bg
 - uninit_bg
 - dir_nlink

What does huge_file and extra_isize give me?

-- 
Regards,
Troels Arvin <[email protected]>
http://troels.arvin.dk/

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