(no subject)

Quoting Michel TALON <talon_at_lpthe.jussieu.fr>:

> Just an idea. This occurred to me once that the superblock and 
primary alternate were corrupted. Hence i was in the same unfortunate 
situation as you, fsck was not working. The situation was solved by 
running newfs with the -N flag on the slice. This printed the location 
of other copies of the superblock. Feeding that to fsck allowed to 
> recover the filesystem, without losing anything.

Booted from the Fixit disk.

On the /temp:

Fixit# newfs -N ad0s2d
/dev/ad0s2d: 512.0MB (1048576 sectors) block size 16384, fragment size 
2048	using 4 cylinder groups of 128.02MB, 8193 blks, 16448 inodes.
super-block backups (for fsck -b #) at:
 160, 262336, 524512, 786688

Fixit# fsck_ufs -b 262336 -n ad0s2d
Alternate super block location: 262336
** /dev/ad0s2d (NO WRITE)
262336 is not a system superblock.

Same with 160, 262336, 524512, 786688


On the /, which when booting from the harddisk and fsck-ing is OK ???:

Fixit# newfs -N ad0s2a
/dev/ad0s2a: 256.0MB (524288 sectors) block size 16384, fragment size 
2048 using 4 cylinder groups of 64.02MB, 4097 blks, 8256 inodes.
super-block backups (for fsck -b #) at:
 160, 131264, 262368, 393472

Fixit# fsck_ufs -b 160 -n ad0s2a
Alternate super block location: 160
** /dev/ad0s2a (NO WRITE)
** Last Mounted on 
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
SUMMARY BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? no

2123 files, 37012 used, 126839 free (7 frags, 15854 blocks, 0.0% 
fragmentation)


Fixit# newfs -N ad0s2
/dev/ad0s2: 84474.6MB (173003984 sectors) block size 16384, fragment 
size 2048 using 460 cylinder groups of 183.77MB, 11761 blks, 23552 
inodes.super-block backups (for fsck -b #) at:
 160, 376512, 752864, 1129216, 1505568, 1881920, 2258272, 2634624, 
3010976, 3387328, 3763680, 4140032, 4516384, 4892736, 5269088, 
5645440, 6021792, 6398144, 6774496, 7150848, 7527200, 7903552, 
8279904, 8656256, 9032608, 9408960, 9785312, 10161664, 10538016, 
10914368, 11290720, 11667072, 12043424, 12419776, 12796128, 13172480, 
13548832, 13925184, 14301536, 14677888, 15054240, 15430592, 15806944, 
16183296, 16559648, 16936000, 17312352, 17688704, 18065056, 18441408, 
18817760, 19194112, 19570464, 19946816, 20323168, 20699520, 21075872, 
21452224, 21828576, 22204928, 22581280, 22957632, 23333984, 23710336, 
24086688, 24463040, 24839392, 25215744, 25592096, 25968448, 26344800, 
26721152, 27097504, 27473856, 27850208, 28226560, 28602912, 28979264, 
29355616, 29731968, 30108320, 30484672, 30861024, 31237376, 31613728, 
31990080, 32366432, 32742784, 33119136, 33495488, 33871840, 34248192, 
34624544, 35000896, 35377248, 35753600, 36129952, 36506304, 36882656, 
37259008, 37635360, 38011712, 38388064, 38764416, 39140768, 39517120, 
39893472, 40269824, 40646176, 41022528, 41398880, 41775232, 42151584, 
42527936, 42904288, 43280640, 43656992, 44033344, 44409696, 44786048, 
45162400, 45538752, 45915104, 46291456, 46667808, 47044160, 47420512, 
47796864, 48173216, 48549568, 48925920, 49302272, 49678624, 50054976, 
50431328, 50807680, 51184032, 51560384, 51936736, 52313088, 52689440, 
53065792, 53442144, 53818496, 54194848, 54571200, 54947552, 55323904, 
55700256, 56076608, 56452960, 56829312, 57205664, 57582016, 57958368, 
58334720, 58711072, 59087424, 59463776, 59840128, 60216480, 60592832, 
60969184, 61345536, 61721888, 62098240, 62474592, 62850944, 63227296, 
63603648, 63980000, 64356352, 64732704, 65109056, 65485408, 65861760, 
66238112, 66614464, 66990816, 67367168, 67743520, 68119872, 68496224, 
68872576, 69248928, 69625280, 70001632, 70377984, 70754336, 71130688, 
71507040, 71883392, 72259744, 72636096, 73012448, 73388800, 73765152, 
74141504, 74517856, 74894208, 75270560, 75646912, 76023264, 76399616, 
76775968, 77152320, 77528672, 77905024, 78281376, 78657728, 79034080, 
79410432, 79786784, 80163136, 80539488, 80915840, 81292192, 81668544, 
82044896, 82421248, 82797600, 83173952, 83550304, 83926656, 84303008, 
84679360, 85055712, 85432064, 85808416, 86184768, 86561120, 86937472, 
87313824, 87690176, 88066528, 88442880, 88819232, 89195584, 89571936, 
89948288, 90324640, 90700992, 91077344, 91453696, 91830048, 92206400, 
92582752, 92959104, 93335456, 93711808, 94088160, 94464512, 94840864, 
95217216, 95593568, 95969920, 96346272, 96722624, 97098976, 97475328, 
97851680, 98228032, 98604384, 98980736, 99357088, 99733440, 100109792, 
100486144, 100862496, 101238848, 101615200, 101991552, 102367904, 
102744256, 103120608, 103496960, 103873312, 104249664, 104626016, 
105002368, 105378720, 105755072, 106131424, 106507776, 106884128,
 107260480, 107636832, 108013184, 108389536, 108765888, 109142240, 
109518592, 109894944, 110271296, 110647648, 111024000, 111400352, 
111776704, 112153056, 112529408, 112905760, 113282112, 113658464, 
114034816, 114411168, 114787520, 115163872, 115540224, 115916576, 
116292928, 116669280, 117045632, 117421984, 117798336, 118174688, 
118551040, 118927392, 119303744, 119680096, 120056448, 120432800, 
120809152, 121185504, 121561856, 121938208, 122314560, 122690912,
 123067264, 123443616, 123819968, 124196320, 124572672, 124949024, 
125325376, 125701728, 126078080, 126454432, 126830784, 127207136, 
127583488, 127959840, 128336192, 128712544, 129088896, 129465248, 
129841600, 130217952, 130594304, 130970656, 131347008, 131723360, 
132099712, 132476064, 132852416, 133228768, 133605120, 133981472, 
134357824, 134734176, 135110528, 135486880, 135863232, 136239584, 
136615936, 136992288, 137368640, 137744992, 138121344, 138497696,
 138874048, 139250400, 139626752, 140003104, 140379456, 140755808, 
141132160, 141508512, 141884864, 142261216, 142637568, 143013920, 
143390272, 143766624, 144142976, 144519328, 144895680, 145272032, 
145648384, 146024736, 146401088, 146777440, 147153792, 147530144, 
147906496, 148282848, 148659200, 149035552, 149411904, 149788256, 
150164608, 150540960, 150917312, 151293664, 151670016, 152046368, 
152422720, 152799072, 153175424, 153551776, 153928128, 154304480,
 154680832, 155057184, 155433536, 155809888, 156186240, 156562592, 
156938944, 157315296, 157691648, 158068000, 158444352, 158820704, 
159197056, 159573408, 159949760, 160326112, 160702464, 161078816, 
161455168, 161831520, 162207872, 162584224, 162960576, 163336928, 
163713280, 164089632, 164465984, 164842336, 165218688, 165595040, 
165971392, 166347744, 166724096, 167100448, 167476800, 167853152, 
168229504, 168605856, 168982208, 169358560, 169734912, 170111264,
 170487616, 170863968, 171240320, 171616672, 171993024, 172369376, 
172745728