Re: SCSI + IDE = HANG

Re: SCSI + IDE = HANG

[Douglas Gilbert]

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

Re: SCSI + IDE = HANG

[syzygy]

the first command sucseeded and my machine seems to be stable with
it...  I then tried the second command and got this...

/dev/hdd:
 setting using_dma to 1 (on)
 setting xfermode to 34 (multiword DMA mode2)
 HDIO_DRIVE_CMD(setxfermode) failed: Input/output error
 using_dma    =  1 (on)

I noted that it turned dma back on and left 32 bit alone...  but the xfer
mode seemed to fail...  it does jhowever still seem stable...  thoughts?



Keith Baker	
Email:	Syzygy@pubnix.org

Life is a sexually transmitted disease with 100% mortality. 

On Sat, 2 Feb 2002, Douglas Gilbert wrote:

> 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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SCSI + IDE = HANG

[syzygy]

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...

General notes:
Motherboard: Supermicro P6DBU w/onboard 2940U2W
CPU: Dual PII 350mhz
SCSI Bus: 0: IBM 9gig U2W, 1: IBM 4gig U2W, 2: Pioneer DVDROM (used for
	ripping)
IDE BUS 0: Maxtor 27 gig
IDE BUS 1: Teac IDE CDRom

Also happens with Teac Slaved to Maxtor

Questions, Comments, Ideas?

Keith Baker	
Email:	Syzygy@pubnix.org

Life is a sexually transmitted disease with 100% mortality.