recovering data from this disk

[Tom Worster]

any suggestions how to recover data from either of the mirrored disks that i
can't get to boot? the situation is described below.

(i'm assuming, given the silence on this, that making the system work after
the freebsd-update is a lost cause.)


On 12/3/09 11:14 AM, "Tom Worster" <fsb at thefsb.org> wrote:

> after running freebsd-update -r 8.0-RELEASE upgrade my system won't boot. it
> gets stuck on mountroot and i can't find the magic word it wants.
> 
> the system used to have two sata drives /dev/ad4 and ad6. they were
> partitioned and sliced using the deafaults that sysinstall suggested.
> 
> at the boot prompt, lsdev says:
> 
> disk devices
>   disk0: BIOS drive C:
>     disk0s1a: FFS
>     disk0s1b: swap
>     disk0s1d: FFS
>     disk0s1e: FFS
>     disk0s1f: FFS
>    disk1: BIOS drive D:
>     disk1s1a: FFS
>     disk1s1b: swap
>     disk1s1d: FFS
>     disk1s1e: FFS
>     disk1s1f: FFS
> 
> which looks right, although i'm not familiar with the "disk" nomenclature.
> 
> entering ? at mountroot mentions ad4 and ad6.
> 
> geom_mirror was being used.
> 
> i've tried saying "load geom_mirror" and/or "enable-module geom_mirror" at the
> boot prompt. neither made any difference.
> 
> nothing i've said to mountroot works:
> 
> ufs:/dev/ad4s1a
> ufs:/dev/ad6s1a
> ufs:/dev/mirror/gm0s1a
> ufs:/dev/disk0s1a
> ufs:/dev/disk1s1a
> 
> does anyone know the magic word? i'd be very grateful.
> 
> tom