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1991-05-21
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backup superblock disk hard scsi optical od
Q: Where are the backup superblocks on the hard disk and on the OD?
A: Key thing to note: there's ALWAYS (supposed to be) an alternate
superblock at block 16. This is sometimes too close to the primary
superblock to avoid damage.
According to newfs [newfs -N -v <device>]:
for the 660 Maxtor Drive:
/usr/etc/newfs -N -v /dev/rsd0a
/etc/mkfs -N /dev/rsd0a 413980 26 15 8192 1024 32 10 60 4096 t Warning: 200 sector(s) in last cylinder unallocated
/dev/rsd0a: 413980 sectors in 1062 cylinders of 15 tracks, 26 sectors 423.9Mb in 34 cyl groups (32 c/g, 12.78Mb/g, 2048 i/g)
super-block backups (for fsck -b#) at:
16, 12528, 25040, 37552, 50064, 62576, 75088, 87600, 100112, 112624, 125136, 137648, 150160, 162672, 175184, 187696, 199696, 212208, 224720, 237232, 249744, 262256, 274768, 287280, 299792, 312304, 324816, 337328, 349840, 362352, 374864, 387376, 399376, 411888,
/usr/etc/newfs -N -v /dev/rsd0b
/etc/mkfs -N /dev/rsd0b 220000 26 15 8192 1024 32 10 60 8192 t Warning: 350 sector(s) in last cylinder unallocated
/dev/rsd0b: 220000 sectors in 565 cylinders of 15 tracks, 26 sectors 225.3Mb in 18 cyl groups (32 c/g, 12.78Mb/g, 1536 i/g)
super-block backups (for fsck -b#) at:
16, 12528, 25040, 37552, 50064, 62576, 75088, 87600, 100112, 112624, 125136, 137648, 150160, 162672, 175184, 187696, 199696, 212208,
for the 330 MB Maxtor Drive:
/usr/etc/newfs -N -v /dev/rsd0a
/etc/mkfs -N /dev/rsd0a 357560 22 10 8192 1024 32 10 60 4096 t Warning: 160 sector(s) in last cylinder unallocated
/dev/rsd0a: 357560 sectors in 1626 cylinders of 10 tracks, 22 sectors 366.1Mb in 51 cyl groups (32 c/g, 7.21Mb/g, 1728 i/g)
super-block backups (for fsck -b#) at:
16, 7080, 14144, 21208, 28272, 35336, 42400, 49464, 56528, 63592, 70656, 77720, 84784, 91848, 98912, 105976, 112656, 119720, 126784, 133848, 140912, 147976, 155040, 162104, 169168, 176232, 183296, 190360, 197424, 204488, 211552, 218616, 225296, 232360, 239424, 246488, 253552, 260616, 267680, 274744, 281808, 288872, 295936, 303000, 310064, 317128, 324192, 331256, 337936, 345000, 352064,
for the Optical Disk:
/usr/etc/newfs -n -v /dev/rod0a
setting optimization for space with minfree less than 10
/etc/mkfs /dev/rod0a 243936 16 15 8192 1024 3 5 50 4096 s
Warning: 144 sector(s) in last cylinder unallocated
/dev/rod0a: 243936 sectors in 1017 cylinders of 15 tracks, 16 sectors
249.8Mb in 339 cyl groups (3 c/g, 0.74Mb/g, 128 i/g)
super-block backups (for fsck -b#) at:
16, 752, 1488, 2224, 2960, 3696, 4432, 5168, 5904, 6640,
7376, 8112, 8848, 9584, 10320, 11056, 11536, 12272, 13008, 13744,
14480, 15216, 15952, 16688, 17424, 18160, 18896, 19632, 20368, 21104,
21840, 22576, 23056, 23792, 24528, 25264, 26000, 26736, 27472, 28208,
28944, 29680, 30416, 31152, 31888, 32624, 33360, 34096, 34576, 35312,
36048, 36784, 37520, 38256, 38992, 39728, 40464, 41200, 41936, 42672,
43408, 44144, 44880, 45616, 46096, 46832, 47568, 48304, 49040, 49776,
50512, 51248, 51984, 52720, 53456, 54192, 54928, 55664, 56400, 57136,
57616, 58352, 59088, 59824, 60560, 61296, 62032, 62768, 63504, 64240,
64976, 65712, 66448, 67184, 67920, 68656, 69136, 69872, 70608, 71344,
72080, 72816, 73552, 74288, 75024, 75760, 76496, 77232, 77968, 78704,
79440, 80176, 80656, 81392, 82128, 82864, 83600, 84336, 85072, 85808,
86544, 87280, 88016, 88752, 89488, 90224, 90960, 91696, 92176, 92912,
93648, 94384, 95120, 95856, 96592, 97328, 98064, 98800, 99536, 100272,
101008, 101744, 102480, 103216, 103696, 104432, 105168, 105904, 106640, 107376,
108112, 108848, 109584, 110320, 111056, 111792, 112528, 113264, 114000, 114736,
115216, 115952, 116688, 117424, 118160, 118896, 119632, 120368, 121104, 121840,
122576, 123312, 124048, 124784, 125520, 126256, 126736, 127472, 128208, 128944,
129680, 130416, 131152, 131888, 132624, 133360, 134096, 134832, 135568, 136304,
137040, 137776, 138256, 138992, 139728, 140464, 141200, 141936, 142672, 143408,
144144, 144880, 145616, 146352, 147088, 147824, 148560, 149296, 149776, 150512,
151248, 151984, 152720, 153456, 154192, 154928, 155664, 156400, 157136, 157872,
158608, 159344, 160080, 160816, 161296, 162032, 162768, 163504, 164240, 164976,
165712, 166448, 167184, 167920, 168656, 169392, 170128, 170864, 171600, 172336,
172816, 173552, 174288, 175024, 175760, 176496, 177232, 177968, 178704, 179440,
180176, 180912, 181648, 182384, 183120, 183856, 184336, 185072, 185808, 186544,
187280, 188016, 188752, 189488, 190224, 190960, 191696, 192432, 193168, 193904,
194640, 195376, 195856, 196592, 197328, 198064, 198800, 199536, 200272, 201008,
201744, 202480, 203216, 203952, 204688, 205424, 206160, 206896, 207376, 208112,
208848, 209584, 210320, 211056, 211792, 212528, 213264, 214000, 214736, 215472,
216208, 216944, 217680, 218416, 218896, 219632, 220368, 221104, 221840, 222576,
223312, 224048, 224784, 225520, 226256, 226992, 227728, 228464, 229200, 229936,
230416, 231152, 231888, 232624, 233360, 234096, 234832, 235568, 236304, 237040,
237776, 238512, 239248, 239984, 240720, 241456, 241936, 242672, 243408,
QA293
Valid for 1.0
Valid for 2.0