How can I fix "Cannot find file system superblock" problem?
FK
fk at zepher.dyndns.org
Sat Dec 16 08:38:24 PST 2006
Dear listers,
Hopefully this may help.
To back up the necessary data,
all I have to do is
$tar -cvzf fk.backup.tgz /usr/home/fk/
assuming that the broken partition /dev/da0s2 is mounted on /,
which means all data I need to back up is
under /usr/home/fk/.
Note: /usr/home/fk/ has lots of files including sub-directories.
The data size is about 15MB (6MB after gzip-ped).
It is almost precise,
since I had had this kind of trouble a few times,
I have had a custom to collect precious data in a single place and
back up my data occasionally.
But ... I will lose one-month-long-worthing data,
which is horrible since I have modified a lot of data for the time.....
Do I have any practical ways to back up the data without mounting it,
given that I could not fix the superblock?
--
FK.
From: FK <fk at zepher.dyndns.org>
Subject: Re: How can I fix "Cannot find file system superblock" problem?
Date: Sat, 16 Dec 2006 22:49:59 +0900
Message-ID: <20061216224959X.fk at zepher.dyndns.org>
fk> Dear all,
fk>
fk> Still I can not solove the problem.
fk> Maybe it is high time to give up,
fk> but before that I wonder,
fk> as everybody who has had this kind of trouble does,
fk> I could mount it read-only and
fk> back up my own data.
fk> The data is too precious for me to lose...
fk>
fk> Thank you for your support.
fk>
fk> --
fk> FK.
fk>
fk> From: FK <fk at zepher.dyndns.org>
fk> Subject: Re: How can I fix "Cannot find file system superblock" problem?
fk> Date: Sun, 10 Dec 2006 15:27:56 +0900
fk> Message-ID: <20061210152756J.fk at zepher.dyndns.org>
fk>
fk> fk> Dear all members,
fk> fk>
fk> fk> From: perryh at pluto.rain.com
fk> fk> Subject: Re: How can I fix "Cannot find file system superblock" problem?
fk> fk> Date: Sat, 09 Dec 2006 14:56:58 -0800
fk> fk> Message-ID: <457b3f3a.e4Sf+YRQsI6sLl6z%perryh at pluto.rain.com>
fk> fk>
fk> fk> perryh> > #diff -s sb1 sb2
fk> fk> perryh> > Files sb1 and sb2 are identical
fk> fk> perryh> > #diff -s sb1 sb3
fk> fk> perryh> > Files sb1 and sb3 are identical
fk> fk> perryh>
fk> fk> perryh> It might be worthwhile to check one of these identical "alternates"
fk> fk> perryh> against the "real" superblock. (AFAIK only the first 512 bytes, or
fk> fk> perryh> less, actually matter.) You might also post a dump of the first 512
fk> fk> perryh> bytes and see if anyone notices anything.
fk> fk>
fk> fk> Thank you for your reply.
fk> fk> Following your suggestions, I tried these.
fk> fk>
fk> fk> #dd if=/dev/da0s2a skip=0 bs=512 count=16 of=sb0
fk> fk> 16+0 records in
fk> fk> 16+0 records out
fk> fk> 8192 bytes transferred in 0.011918 secs (687360 bytes/sec)
fk> fk>
fk> fk> #diff -s sb0 sb1
fk> fk> Binary files sb0 and sb1 differ
fk> fk>
fk> fk> Dump for the master superblock (the first 512 bytes only).
fk> fk> #od -x sb0
fk> fk> 0000000 d440 10fa 9b10 09e1 9524 7b55 f334 153f
fk> fk> 0000020 f190 0b4a 387c 5d46 1b94 14b0 ae10 0b19
fk> fk> 0000040 4e3c b446 b870 138f 7190 0ab7 ff52 75e6
fk> fk> 0000060 5dac 130e bbf0 0a8a 0000 0000 0000 0000
fk> fk> 0000100 0000 0000 0000 0000 0000 0000 0000 0000
fk> fk> 0000120 1d12 7b57 1a88 113f d610 0a84 a2be 064f
fk> fk> 0000140 7eb8 1226 3290 0a44 9e3c 7b57 f870 0f9e
fk> fk> 0000160 cb00 0932 cad0 7b57 1764 13e4 31d0 0ad4
fk> fk> 0000200 0000 0000 0000 0000 0000 0000 4bfa 7b58
fk> fk> 0000220 f54c 1243 41e0 0a4e f1a6 41f0 d97c 13ef
fk> fk> 0000240 eb00 0ad7 cd24 7b58 d334 10a3 66d0 09c8
fk> fk> 0000260 be3c 6d39 7870 15ab d1b0 0b6f 52be 7b59
fk> fk> 0000300 3eb8 0fe3 4600 0973 0000 0000 0000 0000
fk> fk> 0000320 0000 0000 0000 0000 0000 0000 0000 0000
fk> fk> 0000340 007c 7b5a 3b94 1288 2820 0a65 f890 3fda
fk> fk> 0000360 1440 15e3 b780 0b82 81a6 7b5a 197c 10e8
fk> fk> 0000400 ed10 09da 0000 0000 0000 0000 0000 0000
fk> fk> 0000420 2f66 7b5b 1658 138d ed60 0ab5 0000 0000
fk> fk> 0000440 0000 0000 0000 0000 b090 7b5b f440 11ec
fk> fk> 0000460 2d70 0a30 0000 0000 0000 0000 0000 0000
fk> fk> 0000500 31ba 7b5c d228 104c cff0 09ad 5e4e 7b5c
fk> fk> 0000520 f11c 1491 98e0 0b0f ff52 78a4 5dac 11c6
fk> fk> 0000540 18f0 0a23 e3e8 7b5c 5ca0 13d1 c3d0 0acd
fk> fk> 0000560 0000 0000 0000 0000 0000 0000 6512 7b5d
fk> fk> 0000600 3a88 1231 d3e0 0a47 0000 0000 0000 0000
fk> fk> 0000620 0000 0000 e63c 7b5d 1870 1091 a8d0 09c1
fk> fk> 0000640 9abe 514e 5eb8 1471 9230 0b04 0000 0000
fk> fk> 0000660 0000 0000 0000 0000 93fa 7b5e 154c 1336
fk> fk> 0000700 5920 0a98 2ae4 26ef 9010 14b5 c730 0b1b
fk> fk> 0000720 1524 7b5f f334 1195 8930 0a12 41ba 7b5f
fk> fk> 0000740 1228 15db daa0 0b7f 9abe 7b5f 5eb8 10d5
fk> fk> 0000760 8f10 09d4 c2e4 7b5f f010 143a d4a0 0af1
fk> fk>
fk> fk> Dump for one of alternative superblock (the first 512 bytes only).
fk> fk> #od -x sb1
fk> fk> 0000000 0000 0000 0000 0000 0028 0000 0030 0000
fk> fk> 0000020 0038 0000 0bb8 0000 0000 0000 0000 0000
fk> fk> 0000040 0000 0000 0000 0000 0000 0000 0033 0000
fk> fk> 0000060 4000 0000 0800 0000 0008 0000 0008 0000
fk> fk> 0000100 0000 0000 0000 0000 c000 ffff f800 ffff
fk> fk> 0000120 000e 0000 000b 0000 0008 0000 0800 0000
fk> fk> 0000140 0003 0000 0002 0000 0800 0000 0000 0000
fk> fk> 0000160 0000 0000 0800 0000 0040 0000 0000 0000
fk> fk> 0000200 0000 0000 0000 0000 0000 0000 0000 0000
fk> fk> 0000220 bf56 444b a5bf c858 0000 0000 0800 0000
fk> fk> 0000240 4000 0000 0000 0000 0000 0000 0000 0000
fk> fk> 0000260 0000 0000 0000 0000 5c00 0000 6f88 0001
fk> fk> 0000300 0000 0000 0000 0000 0000 0000 0000 0000
fk> fk> 0000320 0100 8000 0000 0000 0000 0000 0000 0000
fk> fk> 0000340 0000 0000 0000 0000 0000 0000 0000 0000
fk> fk> *
fk> fk> 0001520 0000 0000 0000 0000 0000 0000 4000 0000
fk> fk>
fk> fk>
fk> fk> Does my superblock have anything wrong?
fk> fk>
fk> fk> This dump analysis is beyond my tecknical knowledge.
fk> fk> So Thanks a lot for your help!
fk> fk>
fk> fk> --
fk> fk> FK.
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