Re: Changed names of logical disks on recent -CURRENT: part of logical disks not accessible now

From: Jos Backus <jos_at_catnook.com>
Date: Wed, 31 Dec 2008 19:16:34 -0800
	Hi Marcel,

On Mon, Dec 29, 2008 at 10:11:03PM -0800, Marcel Moolenaar wrote:
> I've seen this before: Erase the second sector on your
> disk. You likely have a stale BSD disklabel there.

Before I start erasing, does this look like something that can be erased
safely?

lizzy:~# dd if=/dev/ad0 count=1 skip=1 | hexdump -C
1+0 records in
1+0 records out
512 bytes transferred in 0.009828 secs (52096 bytes/sec)
00000000  57 45 56 82 00 00 00 00  61 6d 6e 65 73 69 61 63  |WEV.....amnesiac|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 02 00 00 3f 00 00 00  |............?...|
00000030  10 00 00 00 15 ed 12 00  f0 03 00 00 b0 82 85 4a  |...............J|
00000040  00 00 00 00 00 00 00 00  10 0e 01 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000080  00 00 00 00 57 45 56 82  a8 07 08 00 00 20 00 00  |....WEV...... ..|
00000090  00 00 00 00 00 00 20 00  10 00 00 00 00 08 00 00  |...... .........|
000000a0  07 08 88 6f 00 00 80 00  10 00 20 00 00 00 00 00  |...o...... .....|
000000b0  01 00 00 00 b0 82 85 4a  00 00 00 00 00 00 00 00  |.......J........|
000000c0  00 00 00 00 00 00 20 00  10 00 a0 00 00 08 00 00  |...... .........|
000000d0  07 08 88 6f 00 00 00 04  10 00 c0 00 00 08 00 00  |...o............|
000000e0  07 08 88 6f a0 82 c5 45  10 00 c0 04 00 08 00 00  |...o...E........|
000000f0  07 08 88 6f 00 00 00 00  00 00 00 00 00 00 00 00  |...o............|
00000100  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200

Or do you mean /dev/ad0s1? (I thought disklabels generally sit inside fdisk
partitions^Wslices.)

lizzy:~# dd if=/dev/ad0s1 count=1 skip=1 | hexdump -C
1+0 records in
1+0 records out
512 bytes transferred in 0.016460 secs (31105 bytes/sec)
00000000  57 45 56 82 00 00 00 00  61 6d 6e 65 73 69 61 63  |WEV.....amnesiac|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000020  00 00 00 00 00 00 00 00  00 02 00 00 3f 00 00 00  |............?...|
00000030  10 00 00 00 14 ed 12 00  f0 03 00 00 71 82 85 4a  |............q..J|
00000040  00 00 00 00 00 00 00 00  10 0e 01 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000080  00 00 00 00 57 45 56 82  68 07 08 00 00 20 00 00  |....WEV.h.... ..|
00000090  00 00 00 00 00 00 20 00  10 00 00 00 00 08 00 00  |...... .........|
000000a0  07 08 88 6f 00 00 80 00  10 00 20 00 00 00 00 00  |...o...... .....|
000000b0  01 00 00 00 71 82 85 4a  00 00 00 00 00 00 00 00  |....q..J........|
000000c0  00 00 00 00 00 00 20 00  10 00 a0 00 00 08 00 00  |...... .........|
000000d0  07 08 88 6f 00 00 00 04  10 00 c0 00 00 08 00 00  |...o............|
000000e0  07 08 88 6f 61 82 c5 45  10 00 c0 04 00 08 00 00  |...oa..E........|
000000f0  07 08 88 6f 00 00 00 00  00 00 00 00 00 00 00 00  |...o............|
00000100  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000110  00 00 00 00 eb 0e 42 54  58 01 02 80 f6 0f 80 06  |......BTX.......|
00000120  00 20 00 00 fa 31 c0 8e  d0 bc 00 18 8e c0 8e d8  |. ...1..........|
00000130  66 6a 02 66 9d bf 00 5e  b9 00 19 f3 ab bb 22 95  |fj.f...^......".|
00000140  b9 10 00 bf 80 00 89 1d  47 47 ab 83 c3 04 e2 f6  |........GG......|
00000150  bf 00 5e be d2 95 ac 98  91 e3 1d ac 92 ad 93 ad  |..^.............|
00000160  b6 08 d1 eb 73 0b 89 05  88 75 02 88 55 05 83 c0  |....s....u..U...|
00000170  04 8d 7d 08 e2 ec eb de  c6 45 05 18 c6 45 08 10  |..}......E...E..|
00000180  c6 45 66 68 bb 20 28 e8  b8 00 0f 01 1e c6 95 0f  |.Efh. (.........|
00000190  01 16 c0 95 0f 20 c0 40  0f 22 c0 ea 8c 90 08 00  |..... ._at_."......|
000001a0  31 c9 b1 10 8e d1 b1 38  0f 00 d9 ba 00 a0 00 00  |1......8........|
000001b0  36 0f b7 05 13 04 00 00  c1 e0 0a 2d 00 10 00 00  |6..........-....|
000001c0  29 d0 b1 33 51 50 68 02  02 00 00 6a 2b ff 35 0c  |)..3QPh....j+.5.|
000001d0  90 00 00 51 51 51 51 52  b1 07 6a 00 e2 fc 61 07  |...QQQQR..j...a.|
000001e0  1f 0f a1 0f a9 cf fa bc  00 18 00 00 0f 20 c0 25  |............. .%|
000001f0  ff ff ff 7f 0f 22 c0 31  c9 0f 22 d9 0f 01 15 c0  |.....".1..".....|
00000200

Thanks and Happy New Year!

Groetjes,
-- 
Jos Backus
jos at catnook.com
Received on Thu Jan 01 2009 - 02:16:12 UTC

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