On 5/1/07, Juan RP <juan@xtrarom.org> wrote:
> On Mon, 30 Apr 2007 16:33:39 -0600 (MDT)
> "Michael L. Hitch" <mhitch@lightning.msu.montana.edu> wrote:
>
> > On Mon, 30 Apr 2007, Konrad Schroder wrote:
> >
> > > If you did use -A, you may have to search the disk for superblocks.  I
> > > don't have a tool that does this, but something like
> >
> >    There's a scan_ffs command in 4.0 or later that is supposed to search
> > for FFSv1, FFSv2, and LFS superblocks.
>
> Yeah... it should find the LFS partition, at least on my test seems to
> work fine:
>
> $ scan_ffs -l vnd0
> Disk: vnd
> Total sectors on disk: 7581696
>
> #        size    offset fstype [fsize bsize cpg/sgs]
> X:      16384         0 4.2BSD    512  4096       1 #  [FFSv1]
> X:      16384     16384 4.2BSD    512  4096       0 #  [FFSv2]
> X:    1048576     32768 4.2BSD   1024  8192       1 #  [FFSv1]
> X:    1048576   1081344 4.2BSD   1024  8192       0 #  [FFSv2]
> X:    1048576   2129920 4.4LFS   1024  8192     282 #  [LFSv2]
> X:    4403200   3178496 4.2BSD   2048 16384       0 #  [FFSv2]
> $
>
> And of course the offset/size/fsize/bsize values are ok.

Yes, thanks a bunch guys. I am still running the command as my file
systems are a few  hundred gigs of size and it takes some time to run
it.
Using Juan's example, how do I calculate the block size to use with
fsck_lfs -b ?
Would that be as simple as using the bsize value?
How is that different from running disklabel on the device ?
Disklabel of this XENU says following (the file system in question is i ):

16 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
 a:    409600         0     4.2BSD   1024  8192 40960  # (Cyl.      0 -    199)
 b:  10240000    409600       swap                     # (Cyl.    200 -   5199)
 c: 412764160         0     unused      0     0        # (Cyl.      0 - 201544)
 d: 412764160         0     unused      0     0        # (Cyl.      0 - 201544)
 e:  20480000  10649600     4.2BSD   2048 16384 27560  # (Cyl.   5200 -  15199)
 f:   4096000  31129600     4.2BSD   2048 16384 27560  # (Cyl.  15200 -  17199)
 g:  10240000  35225600     4.4LFS   2048 16384 25896  # (Cyl.  17200 -  22199)
 h:  20480000  45465600     4.2BSD   2048 16384 27560  # (Cyl.  22200 -  32199)
 i:  61440000  65945600     4.4LFS   2048 16384 28704  # (Cyl.  32200 -  62199)
 j: 285378560 127385600     4.4LFS   2048 16384 28840  # (Cyl.  62200 - 201544)