On Sunday, October 03, 2010, Rob Jarratt wrote:
  The 433au I have came with an instance of Debian which
has DECnet
 installed on it, I am not sure what version of Debian it is. After a
 power outage the superblock on DKA200 was corrupted. I managed to
 install another instance of Debian (3.1r0) on DK0 and run e2fsck -p
 on the DKA200 disk to fix it. However when I try to boot the
 original Debian instance it says it can't find /dev/sdb3. In the new
 instance of Debian I can mount the sdb3 disk without issue. Below is
 the output on the console when it fails to boot. There is a message
 about the driver sd needing to be updated, but this was a working
 system so I am not convinced that is the problem. Can anyone offer
 any insight as to why this will still not boot? 
The kernel is only seeing one disk. By any chance, are you pulling the
first disk (DKA0?) when you try booting from the 2nd disk (DKA200)?
Maybe try telling aboot root=/dev/sda3 for your root device instead.
Pat
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