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@xxxxxxxxxxxxx> http://www-xray.ast.cam.ac.uk/~jss/ X-Ray Group, Institute of Astronomy, University of Cambridge, UK. Public Key Server PGP Key ID: E1AAE053 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html