upgrade to version 8 - can not mount root

[Eduardo]

Thanks to all the replies...  I did solve this problem by doing a low
level format of the disk...  I also saw another thread where this bug
was reported ... http://www.freebsd.org/cgi/query-pr.cgi?pr=130698

I have to find out now, how to indentify this potencial problem on my
other servers, so I would know beforehand that a standard upgrade will
not work.

Cheers.

On Mon, May 23, 2011 at 10:12 AM, Andriy Gapon <avg at freebsd.org> wrote:
> on 20/05/2011 20:36 Eduardo said the following:
>> da0 at ahc0 bus0 scbus0 target 5 lun 0
>> da0 messages ...
>> da0 at ahc0 bus0 scbus0 target 6 lun 0
>> da1 messages ...
>> Trying to mount root from ufs:/dev/da0s1a
>> ROOT MOUNT ERROR:
>> If you have invalid mount options, reboot, and first try the following
>> from the loader prompt:
>> set vfs.root.mountfrom.options=rw
>> and then remove invalid mount options from /etc/fstab
>> Loader variables:
>> vfs.root.mountfrom=ufs:/dev/da0s1a
>> vfs.root.mountfrom.options=rw
>>
>> Manual root filesystem specification:  ...etc..
>>
>> mountroot> <enter>
>>
>> pani: Root mount failed, startup aborted.
>> cpuid=0
>> KBD: stack backtrace:
>> #0 0xc08ebe67 at kdb_backtrace+0x47
>> #1 0xc08bc627 at panic+0x117
>> #2 0xc0943fc7 at vfs_mountroot+0x4f7
>> #3 0xc08737c0 at start_init+0x60
>> #4 0xc0890f51 at fork_exit+0x91
>> #5 0xc0bd5b84 at fork_trampoline+0x8
>>
>> I can boot the old kernel at 7.2 and recompile again with debug flags as needed.
>>
>> One thing I did try just now was to install 8.2 from the CD ... after
>> I choose install options and he goes to create the filesystems I get
>> these error messages:
>>
>>
>> Unable to find device node for /dev/da0s1b in /dev!
>> The creation of filesystems will be aborted.
>
> First, this is not really a question for hackers at .  Perhaps stable@, geom@ or fs@
> would be better choices.
>
> To the subject matter, it seems like you could have an MBR that is reject by code
> in in 8.  Have you tried to get a lit of devices that kernel sees at the mountroot
> prompt?  What are those?
>
> It could also be useful to boot from 8 or 9 live disk and examine how the system
> sees your disks.
>
> --
> Andriy Gapon
>