Date: Sun, 10 Dec 2006 15:27:56 +0900 From: FK <fk@zepher.dyndns.org> To: perryh@pluto.rain.com Cc: fk@zepher.dyndns.org, freebsd-questions@freebsd.org Subject: Re: How can I fix "Cannot find file system superblock" problem? Message-ID: <20061210152756J.fk@zepher.dyndns.org> In-Reply-To: <457b3f3a.e4Sf%2BYRQsI6sLl6z%perryh@pluto.rain.com> References: <20061210061828K.fk@zepher.dyndns.org> <457b3f3a.e4Sf%2BYRQsI6sLl6z%perryh@pluto.rain.com>
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Dear all members, From: perryh@pluto.rain.com Subject: Re: How can I fix "Cannot find file system superblock" problem? Date: Sat, 09 Dec 2006 14:56:58 -0800 Message-ID: <457b3f3a.e4Sf+YRQsI6sLl6z%perryh@pluto.rain.com> perryh> > #diff -s sb1 sb2 perryh> > Files sb1 and sb2 are identical perryh> > #diff -s sb1 sb3 perryh> > Files sb1 and sb3 are identical perryh> perryh> It might be worthwhile to check one of these identical "alternates" perryh> against the "real" superblock. (AFAIK only the first 512 bytes, or perryh> less, actually matter.) You might also post a dump of the first 512 perryh> bytes and see if anyone notices anything. Thank you for your reply. Following your suggestions, I tried these. #dd if=/dev/da0s2a skip=0 bs=512 count=16 of=sb0 16+0 records in 16+0 records out 8192 bytes transferred in 0.011918 secs (687360 bytes/sec) #diff -s sb0 sb1 Binary files sb0 and sb1 differ Dump for the master superblock (the first 512 bytes only). #od -x sb0 0000000 d440 10fa 9b10 09e1 9524 7b55 f334 153f 0000020 f190 0b4a 387c 5d46 1b94 14b0 ae10 0b19 0000040 4e3c b446 b870 138f 7190 0ab7 ff52 75e6 0000060 5dac 130e bbf0 0a8a 0000 0000 0000 0000 0000100 0000 0000 0000 0000 0000 0000 0000 0000 0000120 1d12 7b57 1a88 113f d610 0a84 a2be 064f 0000140 7eb8 1226 3290 0a44 9e3c 7b57 f870 0f9e 0000160 cb00 0932 cad0 7b57 1764 13e4 31d0 0ad4 0000200 0000 0000 0000 0000 0000 0000 4bfa 7b58 0000220 f54c 1243 41e0 0a4e f1a6 41f0 d97c 13ef 0000240 eb00 0ad7 cd24 7b58 d334 10a3 66d0 09c8 0000260 be3c 6d39 7870 15ab d1b0 0b6f 52be 7b59 0000300 3eb8 0fe3 4600 0973 0000 0000 0000 0000 0000320 0000 0000 0000 0000 0000 0000 0000 0000 0000340 007c 7b5a 3b94 1288 2820 0a65 f890 3fda 0000360 1440 15e3 b780 0b82 81a6 7b5a 197c 10e8 0000400 ed10 09da 0000 0000 0000 0000 0000 0000 0000420 2f66 7b5b 1658 138d ed60 0ab5 0000 0000 0000440 0000 0000 0000 0000 b090 7b5b f440 11ec 0000460 2d70 0a30 0000 0000 0000 0000 0000 0000 0000500 31ba 7b5c d228 104c cff0 09ad 5e4e 7b5c 0000520 f11c 1491 98e0 0b0f ff52 78a4 5dac 11c6 0000540 18f0 0a23 e3e8 7b5c 5ca0 13d1 c3d0 0acd 0000560 0000 0000 0000 0000 0000 0000 6512 7b5d 0000600 3a88 1231 d3e0 0a47 0000 0000 0000 0000 0000620 0000 0000 e63c 7b5d 1870 1091 a8d0 09c1 0000640 9abe 514e 5eb8 1471 9230 0b04 0000 0000 0000660 0000 0000 0000 0000 93fa 7b5e 154c 1336 0000700 5920 0a98 2ae4 26ef 9010 14b5 c730 0b1b 0000720 1524 7b5f f334 1195 8930 0a12 41ba 7b5f 0000740 1228 15db daa0 0b7f 9abe 7b5f 5eb8 10d5 0000760 8f10 09d4 c2e4 7b5f f010 143a d4a0 0af1 Dump for one of alternative superblock (the first 512 bytes only). #od -x sb1 0000000 0000 0000 0000 0000 0028 0000 0030 0000 0000020 0038 0000 0bb8 0000 0000 0000 0000 0000 0000040 0000 0000 0000 0000 0000 0000 0033 0000 0000060 4000 0000 0800 0000 0008 0000 0008 0000 0000100 0000 0000 0000 0000 c000 ffff f800 ffff 0000120 000e 0000 000b 0000 0008 0000 0800 0000 0000140 0003 0000 0002 0000 0800 0000 0000 0000 0000160 0000 0000 0800 0000 0040 0000 0000 0000 0000200 0000 0000 0000 0000 0000 0000 0000 0000 0000220 bf56 444b a5bf c858 0000 0000 0800 0000 0000240 4000 0000 0000 0000 0000 0000 0000 0000 0000260 0000 0000 0000 0000 5c00 0000 6f88 0001 0000300 0000 0000 0000 0000 0000 0000 0000 0000 0000320 0100 8000 0000 0000 0000 0000 0000 0000 0000340 0000 0000 0000 0000 0000 0000 0000 0000 * 0001520 0000 0000 0000 0000 0000 0000 4000 0000 Does my superblock have anything wrong? This dump analysis is beyond my tecknical knowledge. So Thanks a lot for your help! -- FK.
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