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SubjectRE: Disk Corruption with ide hpt-366 controller & software raid5
Date
Rogier Wolff wrote:
> If you're seeing THIS kind of errors, it SURE looks like a hardware
> issue. If the software is making errors, I'd expect a random byte
> inserted somewhere. A block of data shifted one byte. A whole block
> corrupted (delivered to the wrong address in memory). Things like
> that.

Yes, I agree. However, I did the following things to try to isolate:
* ran two different drives on the controller, both returned errors
* ran the test disk (showing errors) on a pdc, and it showed no errors
* replaced the cable with a brand new in bag 80 pin 18" udma66 cable

> If it's usually "bit 3" that's wrong, it seems that a cable is too
> long according to spec, a timing issue on the card etc. etc. Something
> like that. Not a software error.
>
> To me that "diff" shows too much correlation between the differing
> values. These are NOT random bytes dropped onto the good data by a
> wild pointer or something like that.

I was always bad at seeing patterns in numbers, but to me it looked very
random. At least even in my short example there are bit problems in each
binary column.

Thanks for your help!

Tom


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