[wailug] Re: ext2

[Blair Harrison]

On Mon, 20 Jan 2003 13:19:06 +1300
tony at access-info.co.nz wrote:

> Got a fun problem.
> Have a 40 gig HD one partition, ext2, hdb1 on a RH7.3.
> 
> Doing some swapping around of hardware, and placed this partition on
> another 7.3. Cam up with seek errors and other crap.
> 
> Then could not mount drive.
> Currently trying to fix it on a rh6.2
> 
> fsck /dev/hdb1 reports
> Couldn't find ext2 superblock, trying backup blocks...
> fsck.ext2 Bad magic number in super-block while trying to open
> /dev/hdb1 
> 
> Tells me to try 
> e2fsck -b 8193 <device>
> 
> I do but no luck
> 
> fdisk tells me this
> 
> /dev/hdb1 start 1 end 4865 blocks 39078081
> and sees a ext2 partition
> 
> Any help or ideas. I have a semi resent backup but would like to get
> some other stuff off the drive as well like isos, whole os's rh 6.2,
> 7.3, 8.0
> 
> tx in advance


You'll need to rebuild the superblock on the drive

http://user-mode-linux.sourceforge.net/sdotm.html near the bottom there
is a script that will do just that :(change /dev/hdb1 as necessary if
you're using a different drive)

backup_sblock=`mke2fs -n /dev/hdb1 | tail -2 | grep , | awk -F, '{print
$1}'` fsck.ext2 -b $backup_sblock /dev/hdb1

basically it'll run through the process of recreating the filesystem
without actually doing anything but it will pull out a superblock backup
location and use that to recreate it.



Cheers, 
	Blair

--- toH, HIvqa' Qun'a'wIj! nachwIjDaq 'obmaQ tu'lu'! ---

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