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SubjectRe: IDE DMA errors [was: Some ext2 errors]
On Sun, Oct 07, 2001 at 11:39:04PM +0100, Riley Williams wrote:
> Hi Mike.

Hey Riley,

> >>> 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.
> > 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.

But we don't know what is happening with David's system.

To rule out some possible causes David, you should run these tests:
memtest86 (
badblocks -s /dev/hda (read only hard drive test, newer versions have a -p
option for safe write mode tests too)

> > 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...

But maybe for david... David, try the tests above with read only badblocks...

> >>>> 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...

It would probably recognize a 2gb drive, which you could easily raid 1 for
your server, assuming that there are two ide connectors on that old 386 MB.

This just adds another possible test... Buying a new power supply.

David, let us know what you find...


> Best wishes from Riley.
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