On Mon, 7 Mar 2005, Samuel Colin wrote:
> I finally found the source of the error.
> Yesterday I made a test by copying a bunch of datas from lacie1 to
> lacieroot, and I noticed that this time the errors did not came from
> lacieroot as it happened before, but from lacie1...
> So today I decided to plug both disks on other plugs, and made the following
> tests (with about 25 Go of data, so I think it's a good test in that
> regard):
>
> - copy from lacie1 to lacieroot
> - copy of the same files from lacieroot to lacie1
> - md5sum of both directories (on lacieroot and lacie1) at the same time.
>
> Not a single error. So I am glad to say that the error was an hardware one,
> and came from a particular plug of the root hub of the machine. This does
> not come too much as a surprise, as it is a mini-form factor ("openbrick
> ng"), and EM interferences might happen (as I saw it as a possible cause
> of error with your problem). At least I identified the plug where the
> problems happen... It also explains why the additional hub solved the
> problem (I do not remember where it was plugged, but most probably on a
> correct plug).
>
> I also saw that your problems were hardware-related... Too bad designers
> seem to forget about sensitivity to EM interferences, I suppose.
Yes. That's why I asked Gerd to try plugging his drive into a known-good
computer.
> Anyway, I am ashamed to have made some people on the list (especially Alan)
> lose their time with me, and if I ever meet them in flesh, they can remind
> me that I must pay them a drink :-). What's funny is that the usb reset
> patch from Alan corrected a hardware problem :-).
It didn't _correct_ the problem -- it just made Linux a lot more resilient
and better at recovering from the errors when they did occur.
Alan Stern
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