Recover a RAID disk
The hardware raid (Perc 3 Adaptec) in my Dell crashed so badly, that i was not able access this disks in a identical machine.
I put one half of the mirror in an other Dell (Perc 4 LSI) and configures it as a single disk.
Than i tried to eleminate the offset for the RAID config in the beginning of the disk with
dd if=/dev/ld1d of=/space/diskimage.dd bs=512 skip=191
and mount is a loopback device
but i allways get errors
Than i discovered
scan_ffs -l /dev/ld1 > partition.txt
afterwards i edited the file and calculated span into the list. Than i made a disklabel ld1 and merged the two files to a resonable partionlist.
disklabel -R ld1 partition.txt
i wrote a new disklabel and could easily mount my partitions.