Problem with filesystem on RAID5 array (fsck -b?)

[Morten A. Middelthon]

Hi list,

I'm running FreeBSD 6.1-RELEASE-p2 on a Dell PowerEdge 1850 with an attached
Dell PowerVault 220S disk cabinet. The cabinet has two RAID5 arrays each with
6 x 300GB SCSI disks. The RAID controller is a Dell PERC4/DC using the amr
driver. Two days ago a disk failed in one of the arrays. Rebuilding the array
after replacing the broken disk did not work as it should, so after discussing
our options with Dell support they recommended I should delete the array on
the controller BIOS, then create a new identical array without initializing
it. According to their theory the data should be intact. Unfortunately, that
doesn't seem to be the case. When FreeBSD boots I get an "UNEXPECTED
INCONSISTENCY" error message when the filesystem is mounted, and then I have
to run fsck manually. When running fsck I get this message:

------------------------------------------------------------------
kepler:~# fsck -y /dev/amrd1s1d
** /dev/amrd1s1d

CANNOT READ BLK: -1365437920
CONTINUE? yes

THE FOLLOWING DISK SECTORS COULD NOT BE READ: 2929529376, 2929529377,
2929529378, 2929529379,

LOOK FOR ALTERNATE SUPERBLOCKS? yes

32 is not a file system superblock
458302416 is not a file system superblock
916604800 is not a file system superblock
1374907184 is not a file system superblock
1833209568 is not a file system superblock

CANNOT SEEK BLK: -2003455344
CONTINUE? yes


CANNOT READ BLK: -2003455344
CONTINUE? yes


CANNOT SEEK BLK: -2003455344
CONTINUE? yes

THE FOLLOWING DISK SECTORS COULD NOT BE READ: -2003455344, -2003455343,
-2003455342, -2003455341, -2003455340, -2003455339, -2003455338, -2003455337,
-2003455336, -2003455335, -2003455334, -2003455333, -2003455332, -2003455331,
-2003455330, -2003455329,

CANNOT SEEK BLK: -1545152960
CONTINUE? yes


CANNOT READ BLK: -1545152960
CONTINUE? yes


CANNOT SEEK BLK: -1545152960
CONTINUE? yes

THE FOLLOWING DISK SECTORS COULD NOT BE READ: -1545152960, -1545152959,
-1545152958, -1545152957, -1545152956, -1545152955, -1545152954, -1545152953,
-1545152952, -1545152951, -1545152950, -1545152949, -1545152948, -1545152947,
-1545152946, -1545152945,
SEARCH FOR ALTERNATE SUPER-BLOCK FAILED. YOU MUST USE THE
-b OPTION TO FSCK TO SPECIFY THE LOCATION OF AN ALTERNATE
SUPER-BLOCK TO SUPPLY NEEDED INFORMATION; SEE fsck(8).
------------------------------------------------------------------

However, the man page does not mention any '-b' option. 

disklabel says:
------------------------------------------------------------------
disklabel /dev/amrd1s1d
# /dev/amrd1s1d:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  c: 2929661532       63    unused        0     0         # "raw" part, don't
edit
  d: 2929661532       63    4.2BSD     2048 16384 28528 
partition c: partition extends past end of unit
disklabel: partition c doesn't start at 0!
disklabel: An incorrect partition c may cause problems for standard system
utilities
partition d: partition extends past end of unit
------------------------------------------------------------------


I'm guessing my data is lost, but I thought I'd check with you guys first before I
create a new filesystem on it.

-- 
Morten A. Middelthon

Do not meddle in the affairs of dragons, 'cuz,
like, you are crunchy and taste good with ketchup.
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