Re: SCSI + IDE = HANG

Douglas Gilbert (dougg@torque.net)
Sat, 02 Feb 2002 13:08:23 -0500


Keith Baker wrote:
>I have had a few random hangs with my machine since I added a maxtor 27
> gig IDE drive to it. I kept trying different combinations of bus
> positions etc. I figured it was flacky hardware or something. I added
> the drive in the early 2.4 series. Recently I became slightly suspicious
> of my Adaptec 2940U2W after reading all of the problems it had in the
> early 2.4. So I upgraded the bios and got kernel 2.4.17. Though the
> problem seems diminished it is certainly not gone...
>
> Now for the kicker... I found a 99% guarenteed way to hard lock my
> box. I tried ripping two cds at a time. One on the ide bus and one on
> the scsi. Just a note the data is being stored to the maxtor 27 gig
> mentioned above. The reason I point to the IDE + SCSI combo is that I can
> do two scsi cdroms ripping to the maxtor and it works much more
> reliably. I am under the impression that IDE CDROMs use the ide bus quite
> heavily under ripping...

Keith,
Does turning off (or reducing the speed of) DMA to the
IDE cdrom with either one of these commands help?
hdparm -d0 -c1 /dev/hdd
hdparm -d 1 -X 34 /dev/hdd
[This assumes the IDE cdrom is connected to /dev/hdd.]

Doug Gilbert
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