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SubjectRe: IDE DMA errors [was: Some ext2 errors]
Hi Mike.

>>> I see this regularly on one of my systems, and hdparm has never
>>> even been insatalled on that system. If I put the drive in a
>>> different system, the drive reports clean, but whatever drive I
>>> put in here regularly reports that problem.

>> Yes, i also have seen this error also when not using hdparm, so
>> it's not the cause of this ext2 errors.

> Oh, sorry, I blamed before I had facts... my bad.

I've done that in the past - it's easy to do - but nowadays, I tend to
wait for more facts before assuming - although I'm by no means perfect
in that regard...

>>> As far as I can tell, it's a problem with the PSU in the computer
>>> in question, as I can swap ANYTHING else in there, motherboard
>>> included, without the problem going away on that drive, but as
>>> soon as I swap the PSU, the problems vanish - even if I put a PSU
>>> with a lower rating in its place.

>> If i see this error show more times i'll try to replace the PSU.
>> First I think is has some relation with my VIA chipset, but if you
>> tell me you have changed even your motherboard... ;)

> It may not be your MB or drive, but an interaction between them.
> I.E. Your bios could've told the linux driver to use a higher
> dma level than the drive likes.

Always possible, but I'd consider it unlikely that using the SAME
motherboard and drive, but with a different PSU would have any affect
whatsoever if such was the reason.

I would presume that the old PSU was just too noisy for that
particular drive, and a new PSU is rather quieter in that regard.

> Try running "hdparm -d0 /dev/hda" (since your drive is hda in
> this case...) And see if the problem goes away. If it does, then
> try Multimode dma, if (-X34) you get errors, try single mode
> (probably -X31), if you get no errors there, try UDMA mode 2
> (-X66, also make sure you have a 80 line ide cable) and see if
> any of the problems come back.

Unfortunately, none of that is relevant in my case...see below...

>>>> Yeah. If you can't figure out hdparm, leave it alone.

>>> Who says hdparm has anything to do with it?

>> He says, it seems he has very deep knowledge of hdparm 'secrets'.

> Again, sorry for being presumptuous. I've only been able to cause
> this with hdparm. Maybe I'm just not using new enough hardware...

The system in question is my network printserver, which has a 386sx/16
processor and a very definitely 40 line cable with no support for
anything else. The hard drive is an antique Maxtor 800M one, and I
have no problem assuring you that it's not possible to buy that model
new, and hasn't been for some years now...

Best wishes from Riley.

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