Hi,
On Mon, 22 Feb 2010 13:44:46 -0300, Edgard Pineda wrote:
> Hi,
>
> I just had a 4 harddrives in raid5 with nilfs2 (kernel 2.6.32 and
> nilfs-utils 2.0.15) and I've got a power cut, then I rebuilt the
> array, but when I tried to mount the nilfs2 partition I've got:
> "NILFS: Can't find nilfs on dev md0" (in dmesg) after execute
> "mount.nilfs2: Error while mounting /dev/md0 on disk: Invalid
> argument".
>
> Any idea? can I mount as "read only" to rescue some files? any tools
> to "see" the files and fix the partition?
>
> Regards,
> Edgard.
Umm.., sounds serious. The message "NILFS: Can't find nilfs on xxx"
is output when both of the two super blocks are broken.
Can you dump the partition with hd command?
# hd /dev/md0 | less
If the partition is not filled yet, it would look like this:
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000400 02 00 00 00 00 00 34 34 00 01 00 00 7b 93 80 d4 |......44....{...|
00000410 50 09 11 38 02 00 00 00 17 11 00 00 00 00 00 00 |P..8............|
00000420 00 5e 8f 8b 08 00 00 00 01 00 00 00 00 00 00 00 |.^..............|
00000430 00 08 00 00 05 00 00 00 79 00 00 00 00 00 00 00 |........y.......|
00000440 25 70 00 00 00 00 00 00 0e 00 00 00 00 00 00 00 |%p..............|
00000450 00 88 88 00 00 00 00 00 bb fb 7c 4b 00 00 00 00 |..........|K....|
00000460 71 d4 7f 4b 00 00 00 00 85 d4 7f 4b 00 00 00 00 |q..K.......K....|
00000470 03 00 32 00 01 00 01 00 bb fb 7c 4b 00 00 00 00 |..2.......|K....|
00000480 00 4e ed 00 00 00 00 00 00 00 00 00 0b 00 00 00 |.N..............|
00000490 80 00 20 00 c0 00 10 00 8f d2 a7 e6 99 7a 41 e8 |.. ..........zA.|
000004a0 ae 88 26 e1 48 0c a5 f4 00 00 00 00 00 00 00 00 |..&.H...........|
000004b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00001000 dd 21 ee fe 80 ad 4e a1 11 fa af 1e 38 00 07 00 |.!....N.....8...|
00001010 00 00 00 00 00 00 00 00 bb fb 7c 4b 00 00 00 00 |..........|K....|
...
where "34 34" at offset 0x0406 is the magic number of NILFS.
Regards,
Ryusuke Konishi
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