[NTLUG:Discuss] EXT3-fs: group descriptors corrupted!

[Wayne Walker]

First, are you certain that /dev/sdb is the right device?  Maybe it's 
/dev/sdb1?   fdisk -l /dev/sdb    should help clarify whether or not 
you have partitions.

mount -o ro,errors=continue /dev/sdb /wwwmount

That should mount it read only.  If that doesn't work,
then run "dumpe2fs /dev/sdb | less"  Look for "Backup superblock at "

Read the mount man page about the -sb option.  You do NOT directly use
the number found above, you have to do some math.


On Mon, Jul 23, 2007 at 06:10:27AM +0000, m m wrote:
> All:
>  
> when try to mount an existing ext3 HD the Frdora 7 box, get this (EXT3-fs: group descriptors corrupted!) error. 
> see below I did:
>  
> # mount /dev/sdb /wwwmount: wrong fs type, bad option, bad superblock on /dev/sdb,       missing codepage or other error       In some cases useful info is found in syslog - try       dmesg | tail  or so
>  
> # dmesg | taildevice peth0 entered promiscuous modeeth0: port 1(peth0) entering learning stateeth0: topology change detected, propagatingeth0: port 1(peth0) entering forwarding statepeth0: no IPv6 routers presenteth0: no IPv6 routers presentEXT3-fs error (device sdb): ext3_check_descriptors: Block bitmap for group 880 not in group (block 0)!EXT3-fs: group descriptors corrupted!EXT3-fs error (device sdb): ext3_check_descriptors: Block bitmap for group 880 not in group (block 0)!EXT3-fs: group descriptors corrupted!
>  
> # fsck.ext3 /dev/sdbe2fsck 1.39 (29-May-2006)Group descriptors look bad... trying backup blocks...fsck.ext3: Bad magic number in super-block while trying to open /dev/sdb
> The superblock could not be read or does not describe a correct ext2filesystem.  If the device is valid and it really contains an ext2filesystem (and not swap or ufs or something else), then the superblockis corrupt, and you might try running e2fsck with an alternate superblock:    e2fsck -b 8193 <device>
>  
> # fsck.ext3 -b 8193 /dev/sdbe2fsck 1.39 (29-May-2006)fsck.ext3: Bad magic number in super-block while trying to open /dev/sdb
> The superblock could not be read or does not describe a correct ext2filesystem.  If the device is valid and it really contains an ext2filesystem (and not swap or ufs or something else), then the superblockis corrupt, and you might try running e2fsck with an alternate superblock:    e2fsck -b 8193 <device>
>  
> (i also tried other numbers, something > 8193, no work) 
>  
> # fdisk -l
> Disk /dev/sda: 13.5 GB, 13578485760 bytes255 heads, 63 sectors/track, 1650 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes
>    Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          13      104391   83  Linux/dev/sda2              14        1650    13149202+  8e  Linux LVM
> Disk /dev/sdb: 300.0 GB, 300069052416 bytes255 heads, 63 sectors/track, 36481 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes
>    Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1       36481   293033601   83  Linux
>  
> # fdisk /dev/sdb
> The number of cylinders for this disk is set to 36481.There is nothing wrong with that, but this is larger than 1024,and could in certain setups cause problems with:1) software that runs at boot time (e.g., old versions of LILO)2) booting and partitioning software from other OSs   (e.g., DOS FDISK, OS/2 FDISK)
>  
> I have googled about this problem. no luck.
>  
> I use to mount it on the Fedora 6, it worked.  
>  
>  
> Can anyone help!?
>  
> Thanks.
>  
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Wayne Walker

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