restore superblock

[PJ]

PJ wrote:
> I have been googling for superblock restore and things are a bit 
> confusing. Some of the commands don't seem to match current fsck 
> parameters (notably -b doesn't exist.
> Apparently I should be able to reconstruct the superblock(s) on my 
> /usr partition (slice ?) as my searches found that there are backups 
> of the superblocks on the files systems.
> But how do I find them and restore the corrupt ones? Not clear in my 
> searches.
> I have another installation of fbsd 7.0 on another machine with the 
> partitioning identical and identical hdds.
> How could I use the superblock and/or other information from the good 
> installation to repair the damaged one - or would it be possible to 
> recover the superblock info from the damaged one's backcups?
> Phil Jourdan
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Here is what I get when I run fsck /dev/ad8s1f :

**fsck /dev/ad8s1f
**Last Mounted on /usr
Phase 1 - Check Blocks and Sizes

UNKNOWN FILE TYPE I=2802880
UNEXPECTED SOFT UPDATE INCONSISTENCY

(I answered n to all the remove? [yn] questions)

UNKNOWN FILE TYPE I=3297280
UNKNOWN FILE TYPE I=3297408

INCORRECT BLOCK COUNT I=4008454 (1440 should be 384)

PHASE 2 - Check Pathnames
DUP/BAD I=3297280 OWNER = ROOT MODE=40755 SIZE=8192 MTIME= JUL 21 14:25 2008
DIR= /lib

Hope this give some useful information.
Phil Jourdan