From: Jeremy Sanders <jss@ast.cam.ac.uk>
Subject: fsck.ext4: Group descriptors look bad... trying backup blocks...
Date: Fri, 17 Apr 2009 12:03:33 +0100
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Hi - I'm trying out ext4 on a large 8.2 TB software raid device (md). On 
rebooting (cleanly unmounting), I tried an fsck on the device. I get the 
following:

[root@xback2 ~]# fsck /dev/md0
fsck 1.41.4 (27-Jan-2009)
e2fsck 1.41.4 (27-Jan-2009)
fsck.ext4: Group descriptors look bad... trying backup blocks...
Group descriptor 0 checksum is invalid.  Fix<y>?

It then finds lots of bad group descriptors.

This is Fedora 10, 2.6.27.21-170.2.56.fc10.x86_64 and 
e2fsprogs-1.41.4-4.fc10.x86_64.

Jeremy

-- 
Jeremy Sanders <jss@ast.cam.ac.uk>   http://www-xray.ast.cam.ac.uk/~jss/
X-Ray Group, Institute of Astronomy, University of Cambridge, UK.
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