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Forums » Tech and Talk » OS and Software » All Things Unix » [FreeBSD] Disk read corruption issues on server.
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krod
meh

join:2007-04-08
1 edit		reply to galacticroot
Re: [FreeBSD] Disk read corruption issues on server.

I noticed in your previous topic it was always that 8valued bit, and that it was 7h(0x0111) changed to Fh(0x1111), but that was only with a few samples you gave and the first one didnt match that rule(in increased in size?? or was that a typo?)
to forum · permalink · · 2007-05-25 03:35:17 · Reply to this

galacticroot

join:2004-05-17
clubs:

It is occurring at the same space in 64 bit blocks, and the PCI bus is 64 bit. I would assume that that an error on that would cause other issues, but maybe not. The RAID controller has error corrected memory, so I assume the problem would be detected if it was that.

Interestingly, by far the most common change is from f7 to ff. Assuming the /dev/urandom (which the file is from) produces reasonably distributed data, the corrupted bit seems to be highly dependent on the bits around it. This may indicate that the problem is caused by a minor voltage leakage between adjacent bus lines. Perhaps the PCI connection needs cleaning or reseating?

Here is a more extensive summary of the file changes. This is a different read and does not correspond with the XORed file above.
2416204: (d7 != df) ^= 8 BIN: 11010111 11011111
3bfbe04: (ff != f7) ^= 8 BIN: 11111111 11110111
4012304: (77 != 7f) ^= 8 BIN: 01110111 01111111
4c42804: (7f != 77) ^= 8 BIN: 01111111 01110111
51a4904: (ff != f7) ^= 8 BIN: 11111111 11110111
5f2e004: (f7 != ff) ^= 8 BIN: 11110111 11111111
6619204: (f7 != ff) ^= 8 BIN: 11110111 11111111
7cf6404: (f7 != ff) ^= 8 BIN: 11110111 11111111
7ef3f04: (f7 != ff) ^= 8 BIN: 11110111 11111111
80f0c04: (f7 != ff) ^= 8 BIN: 11110111 11111111
8c92004: (ff != f7) ^= 8 BIN: 11111111 11110111
8ce5104: (ff != f7) ^= 8 BIN: 11111111 11110111
9ec5304: (ff != f7) ^= 8 BIN: 11111111 11110111
aabcc04: (7f != 77) ^= 8 BIN: 01111111 01110111
b860594: (f7 != ff) ^= 8 BIN: 11110111 11111111
c296f04: (f7 != ff) ^= 8 BIN: 11110111 11111111
c4b5a04: (ef != e7) ^= 8 BIN: 11101111 11100111
c9ddc04: (7f != 77) ^= 8 BIN: 01111111 01110111
cc9b204: (f7 != ff) ^= 8 BIN: 11110111 11111111
cdb7204: (f7 != ff) ^= 8 BIN: 11110111 11111111
e060f04: (e7 != ef) ^= 8 BIN: 11100111 11101111
e5b9504: (d7 != df) ^= 8 BIN: 11010111 11011111
f2a570c: (df != d7) ^= 8 BIN: 11011111 11010111
f52cc04: (f7 != ff) ^= 8 BIN: 11110111 11111111
10540904: (77 != 7f) ^= 8 BIN: 01110111 01111111
107a0904: (d7 != df) ^= 8 BIN: 11010111 11011111
125c5504: (ef != e7) ^= 8 BIN: 11101111 11100111
12836604: (f6 != fe) ^= 8 BIN: 11110110 11111110
12a61204: (d7 != df) ^= 8 BIN: 11010111 11011111
12d4ce04: (ff != f7) ^= 8 BIN: 11111111 11110111
132a4e04: (ff != f7) ^= 8 BIN: 11111111 11110111
14210404: (e7 != ef) ^= 8 BIN: 11100111 11101111
14c32c04: (f5 != fd) ^= 8 BIN: 11110101 11111101
162c0504: (ff != f7) ^= 8 BIN: 11111111 11110111
16801004: (f7 != ff) ^= 8 BIN: 11110111 11111111
176fdb04: (ff != f7) ^= 8 BIN: 11111111 11110111
18904d04: (ff != f7) ^= 8 BIN: 11111111 11110111
1b649504: (f7 != ff) ^= 8 BIN: 11110111 11111111
1ca7cb04: (77 != 7f) ^= 8 BIN: 01110111 01111111
1d460004: (77 != 7f) ^= 8 BIN: 01110111 01111111
1d845604: (fb != f3) ^= 8 BIN: 11111011 11110011
1eb84d04: (ff != f7) ^= 8 BIN: 11111111 11110111
20672904: (d7 != df) ^= 8 BIN: 11010111 11011111
20df9f04: (ff != f7) ^= 8 BIN: 11111111 11110111
20f04304: (ff != f7) ^= 8 BIN: 11111111 11110111
212a4b04: (ff != f7) ^= 8 BIN: 11111111 11110111
221aa904: (77 != 7f) ^= 8 BIN: 01110111 01111111
22765104: (6f != 67) ^= 8 BIN: 01101111 01100111
23659e04: (f6 != fe) ^= 8 BIN: 11110110 11111110
236da904: (77 != 7f) ^= 8 BIN: 01110111 01111111
25744604: (ff != f7) ^= 8 BIN: 11111111 11110111
25cd1404: (e7 != ef) ^= 8 BIN: 11100111 11101111
25e8cf04: (ff != f7) ^= 8 BIN: 11111111 11110111
2603bf04: (f7 != ff) ^= 8 BIN: 11110111 11111111
262f9c04: (77 != 7f) ^= 8 BIN: 01110111 01111111
269bca04: (df != d7) ^= 8 BIN: 11011111 11010111
274b0904: (f5 != fd) ^= 8 BIN: 11110101 11111101
2750a704: (f7 != ff) ^= 8 BIN: 11110111 11111111
28082c04: (ff != f7) ^= 8 BIN: 11111111 11110111
28e7da04: (f7 != ff) ^= 8 BIN: 11110111 11111111
2a4e4f04: (df != d7) ^= 8 BIN: 11011111 11010111
2afe5904: (fe != f6) ^= 8 BIN: 11111110 11110110
2b70c904: (ff != f7) ^= 8 BIN: 11111111 11110111
2cbb3504: (d7 != df) ^= 8 BIN: 11010111 11011111
2d6637fc: (f7 != ff) ^= 8 BIN: 11110111 11111111
2dca4f04: (df != d7) ^= 8 BIN: 11011111 11010111
2dcab804: (ff != f7) ^= 8 BIN: 11111111 11110111
2f782b04: (e7 != ef) ^= 8 BIN: 11100111 11101111
2fd42604: (7f != 77) ^= 8 BIN: 01111111 01110111
2ffdd604: (ff != f7) ^= 8 BIN: 11111111 11110111
30763704: (f7 != ff) ^= 8 BIN: 11110111 11111111
3092c404: (ff != f7) ^= 8 BIN: 11111111 11110111
30cc1104: (f7 != ff) ^= 8 BIN: 11110111 11111111
30fb9804: (d7 != df) ^= 8 BIN: 11010111 11011111
31330704: (f7 != ff) ^= 8 BIN: 11110111 11111111
31d64004: (ff != f7) ^= 8 BIN: 11111111 11110111
32544304: (cf != c7) ^= 8 BIN: 11001111 11000111
32731104: (77 != 7f) ^= 8 BIN: 01110111 01111111
3309a50c: (f7 != ff) ^= 8 BIN: 11110111 11111111
335ba204: (f7 != ff) ^= 8 BIN: 11110111 11111111
34c9a404: (e7 != ef) ^= 8 BIN: 11100111 11101111
3527a604: (57 != 5f) ^= 8 BIN: 01010111 01011111
35481204: (f7 != ff) ^= 8 BIN: 11110111 11111111
35d85104: (7e != 76) ^= 8 BIN: 01111110 01110110
362f5304: (d7 != df) ^= 8 BIN: 11010111 11011111
3840da04: (ff != f7) ^= 8 BIN: 11111111 11110111
38a33004: (f5 != fd) ^= 8 BIN: 11110101 11111101
39185804: (ef != e7) ^= 8 BIN: 11101111 11100111
3a15a904: (d7 != df) ^= 8 BIN: 11010111 11011111
3a554704: (f7 != ff) ^= 8 BIN: 11110111 11111111
3c5f6f04: (d7 != df) ^= 8 BIN: 11010111 11011111
3d17ae04: (77 != 7f) ^= 8 BIN: 01110111 01111111
3d492f04: (f7 != ff) ^= 8 BIN: 11110111 11111111
3fad7604: (ff != f7) ^= 8 BIN: 11111111 11110111
3fb65104: (ff != f7) ^= 8 BIN: 11111111 11110111
3fe71e04: (57 != 5f) ^= 8 BIN: 01010111 01011111
40204404: (ff != f7) ^= 8 BIN: 11111111 11110111
40b79b04: (d7 != df) ^= 8 BIN: 11010111 11011111
4478db04: (f7 != ff) ^= 8 BIN: 11110111 11111111
45444c04: (ef != e7) ^= 8 BIN: 11101111 11100111
4544b804: (76 != 7e) ^= 8 BIN: 01110110 01111110
45745404: (ff != f7) ^= 8 BIN: 11111111 11110111
45bfaa04: (d7 != df) ^= 8 BIN: 11010111 11011111
45d12004: (77 != 7f) ^= 8 BIN: 01110111 01111111
45d20004: (55 != 5d) ^= 8 BIN: 01010101 01011101
477d88bc: (76 != 7e) ^= 8 BIN: 01110110 01111110
478d7004: (67 != 6f) ^= 8 BIN: 01100111 01101111
48945c04: (dd != d5) ^= 8 BIN: 11011101 11010101
48dc4d04: (ff != f7) ^= 8 BIN: 11111111 11110111
493cbf04: (ff != f7) ^= 8 BIN: 11111111 11110111
49afa204: (57 != 5f) ^= 8 BIN: 01010111 01011111
49d3bf04: (ff != f7) ^= 8 BIN: 11111111 11110111
49d84c04: (ff != f7) ^= 8 BIN: 11111111 11110111
4a763804: (ff != f7) ^= 8 BIN: 11111111 11110111
4a935704: (67 != 6f) ^= 8 BIN: 01100111 01101111
4c640504: (f7 != ff) ^= 8 BIN: 11110111 11111111
4c6c1d04: (f7 != ff) ^= 8 BIN: 11110111 11111111
4c7f2604: (ff != f7) ^= 8 BIN: 11111111 11110111
4d674204: (d7 != df) ^= 8 BIN: 11010111 11011111
4dc88704: (f7 != ff) ^= 8 BIN: 11110111 11111111
4ec13b04: (f7 != ff) ^= 8 BIN: 11110111 11111111
4ece0a04: (f7 != ff) ^= 8 BIN: 11110111 11111111
4fe22d04: (ff != f7) ^= 8 BIN: 11111111 11110111
501c4f04: (fd != f5) ^= 8 BIN: 11111101 11110101
503eb104: (f7 != ff) ^= 8 BIN: 11110111 11111111
51f04304: (d7 != df) ^= 8 BIN: 11010111 11011111
51f7c704: (ff != f7) ^= 8 BIN: 11111111 11110111
522e570c: (df != d7) ^= 8 BIN: 11011111 11010111
52320b04: (f7 != ff) ^= 8 BIN: 11110111 11111111
5271cc04: (7f != 77) ^= 8 BIN: 01111111 01110111
5274da04: (ef != e7) ^= 8 BIN: 11101111 11100111
53791f04: (f7 != ff) ^= 8 BIN: 11110111 11111111
538eb904: (df != d7) ^= 8 BIN: 11011111 11010111
53b9a304: (f7 != ff) ^= 8 BIN: 11110111 11111111
53d0bf04: (ff != f7) ^= 8 BIN: 11111111 11110111
555a5f04: (ff != f7) ^= 8 BIN: 11111111 11110111
560b8204: (f7 != ff) ^= 8 BIN: 11110111 11111111
560b8c04: (77 != 7f) ^= 8 BIN: 01110111 01111111
571fb704: (f7 != ff) ^= 8 BIN: 11110111 11111111
57a71404: (dd != d5) ^= 8 BIN: 11011101 11010101
587d1004: (77 != 7f) ^= 8 BIN: 01110111 01111111
590d3104: (d7 != df) ^= 8 BIN: 11010111 11011111
59b3a504: (d7 != df) ^= 8 BIN: 11010111 11011111
59f42304: (f7 != ff) ^= 8 BIN: 11110111 11111111
5bf24c04: (f7 != ff) ^= 8 BIN: 11110111 11111111
5c82bc04: (ff != f7) ^= 8 BIN: 11111111 11110111
5ed83c04: (df != d7) ^= 8 BIN: 11011111 11010111
5ee54b04: (f7 != ff) ^= 8 BIN: 11110111 11111111
5f75ba04: (f7 != ff) ^= 8 BIN: 11110111 11111111
5ff41004: (77 != 7f) ^= 8 BIN: 01110111 01111111
5ffc4504: (ff != f7) ^= 8 BIN: 11111111 11110111
6001a204: (d7 != df) ^= 8 BIN: 11010111 11011111
6086a604: (ff != f7) ^= 8 BIN: 11111111 11110111
612ec604: (ff != f7) ^= 8 BIN: 11111111 11110111
61cab504: (f7 != ff) ^= 8 BIN: 11110111 11111111
61e53204: (7f != 77) ^= 8 BIN: 01111111 01110111
62de0204: (f7 != ff) ^= 8 BIN: 11110111 11111111
638d0f04: (77 != 7f) ^= 8 BIN: 01110111 01111111
63ddb804: (f7 != ff) ^= 8 BIN: 11110111 11111111
66149304: (f7 != ff) ^= 8 BIN: 11110111 11111111
66504e04: (ff != f7) ^= 8 BIN: 11111111 11110111
66b42a04: (7f != 77) ^= 8 BIN: 01111111 01110111
693b2204: (f7 != ff) ^= 8 BIN: 11110111 11111111
69404e04: (ff != f7) ^= 8 BIN: 11111111 11110111
69592504: (f7 != ff) ^= 8 BIN: 11110111 11111111
69fb3004: (e7 != ef) ^= 8 BIN: 11100111 11101111
6a2dad04: (e7 != ef) ^= 8 BIN: 11100111 11101111
6b37bd04: (df != d7) ^= 8 BIN: 11011111 11010111
6b705b04: (ff != f7) ^= 8 BIN: 11111111 11110111
6b85fc04: (ff != f7) ^= 8 BIN: 11111111 11110111
6c724704: (7f != 77) ^= 8 BIN: 01111111 01110111
6c7b1104: (57 != 5f) ^= 8 BIN: 01010111 01011111
6d60cd04: (ff != f7) ^= 8 BIN: 11111111 11110111
6e54b004: (ff != f7) ^= 8 BIN: 11111111 11110111
6e7c2804: (f7 != ff) ^= 8 BIN: 11110111 11111111
6e932804: (57 != 5f) ^= 8 BIN: 01010111 01011111
6ed6f504: (df != d7) ^= 8 BIN: 11011111 11010111
6ef6c904: (f7 != ff) ^= 8 BIN: 11110111 11111111
6f9a9e04: (f7 != ff) ^= 8 BIN: 11110111 11111111
6fe7b204: (f7 != ff) ^= 8 BIN: 11110111 11111111
6feff704: (f7 != ff) ^= 8 BIN: 11110111 11111111
6ff2de04: (d7 != df) ^= 8 BIN: 11010111 11011111
707c0404: (ff != f7) ^= 8 BIN: 11111111 11110111
70c33504: (ff != f7) ^= 8 BIN: 11111111 11110111
7359c104: (c7 != cf) ^= 8 BIN: 11000111 11001111
74f21204: (d7 != df) ^= 8 BIN: 11010111 11011111
75033e04: (f7 != ff) ^= 8 BIN: 11110111 11111111
75905304: (af != a7) ^= 8 BIN: 10101111 10100111
75adc904: (f7 != ff) ^= 8 BIN: 11110111 11111111
761daa04: (77 != 7f) ^= 8 BIN: 01110111 01111111
7669b504: (f7 != ff) ^= 8 BIN: 11110111 11111111
76b3ac04: (d7 != df) ^= 8 BIN: 11010111 11011111
76de7504: (ff != f7) ^= 8 BIN: 11111111 11110111
76f1e404: (ff != f7) ^= 8 BIN: 11111111 11110111
78b6d404: (ff != f7) ^= 8 BIN: 11111111 11110111
79544e04: (f7 != ff) ^= 8 BIN: 11110111 11111111
79e1bf04: (ff != f7) ^= 8 BIN: 11111111 11110111
79ef3604: (ff != f7) ^= 8 BIN: 11111111 11110111
79f43b04: (77 != 7f) ^= 8 BIN: 01110111 01111111
7b330404: (f7 != ff) ^= 8 BIN: 11110111 11111111
7ba80504: (f7 != ff) ^= 8 BIN: 11110111 11111111
7bf94104: (f7 != ff) ^= 8 BIN: 11110111 11111111
7c3d3004: (f7 != ff) ^= 8 BIN: 11110111 11111111
7c7f4604: (ff != f7) ^= 8 BIN: 11111111 11110111
7d65da04: (d7 != df) ^= 8 BIN: 11010111 11011111
7d90db04: (ff != f7) ^= 8 BIN: 11111111 11110111
7daacc04: (f7 != ff) ^= 8 BIN: 11110111 11111111
7e744504: (7e != 76) ^= 8 BIN: 01111110 01110110
7f540204: (c7 != cf) ^= 8 BIN: 11000111 11001111
7f75b204: (e7 != ef) ^= 8 BIN: 11100111 11101111
7f913604: (57 != 5f) ^= 8 BIN: 01010111 01011111
to forum · permalink · · 2007-05-25 18:23:35 · Reply to this

galacticroot

join:2004-05-17
clubs:		 Problem solved. There was a scratch and corrosion across some of the traces on an unused PCI riser card.
to forum · permalink · · 2007-06-17 19:00:09 · Reply to this
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