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Re: Filesystem won't mount because of "unsupported optional features (80)"

On Feb 17, 2007  01:32 -0500, Maurice Volaski wrote:
 I made a filesystem (mke2fs -j) on a logical volume under kernel
 2.6.20 on a 64-bit based system, and when I try to mount it, ext3
 complains with

 EXT3-fs: dm-1: couldn't mount because of unsupported optional features (80).

 I first thought I just forgot to make the filesystem, so I remade it
 and the error is still present. I ran fsck on this freshly made
 filesystem, and it completed with no errors.

 Filesystem features:      has_journal resize_inode dir_index filetype
			    64bit sparse_super large_file

 What could be causing this error and what does "80" refer to?

For some reason the 64bit feature is set in the filesystem.  This should
only be set for ext4dev filesystems.  Are you specifying this feature
yourself e.g. "mke2fs -O 64bit ..."?  Your filesystem is only 2.7TB so
you don't need the 64bit feature set and it doesn't really help you
unless you plan to expand the logical volume past 16TB.

If you do need this functionality then you need to use the ext4dev
filesystem, but this is currently a work-in-progress and shouldn't
be used for critical data.

I have no idea how it got there. I make the filesystem with mke2fs -j and the mke2fs.conf lists "base_features = sparse_super,filetype,resize_inode,dir_index". I do not have ext4dev compiled into the kernel at all. My other filesystems, all under 2 TB, seem to be working, so I wonder whether somehow some ext4dev got erroneously added to ext3, and it's being applied to filesystems that are greater than 2 TB and are being compiled with 64-bit gcc, just a wild guess on my part.

Maurice Volaski, mvolaski aecom yu edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University

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