On Wed, Feb 07, 2001 at 04:35:25PM -0500, Curt Sampson wrote:
> On Wed, 7 Feb 2001, Manuel Bouyer wrote:
> 
> > Mode 1, isn't it ? The chipset can at best do mode 2.
> 
> Right. What I get is this:
> 
> wd0: transfer error, downgrading to Ultra-DMA mode 1
> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data transfers)
> wd0a: DMA error reading fsbn 16 of 16-31 (wd0 bn 79; cn 0 tn 1 sn 16), retrying
> wd0: soft error (corrected)
> root file system type: ffs
> 
> Now the drive itself does do Mode 2 Ultra DMA (and mode 4, even), so
> what's with the downgrade? Is it the chipset? Sounds like it, from this:
> 
> > The machine I'm typing this has a P5A, and never noticed any problems other
> > than not being able to do UDMA mode 2 with Ultra/66 or Ultra/100 drives
> > (works fine with Ultra/33 drives).

Yes, there's something with this chipset that causes this. I don't know what.
I've not been able to track it down; maybe it's a silicon bug (the way the
BIOS set it up doesn't work as well).

> 
> Anyway, I think we have a false alarm here, as when I got into work
> this morning I found a screen continuously scrolling `uncorrectable
> data error' messages on three different blocks. I put in a new drive
> and whacked on it a bit (multiple concurrent bonnies and large untars)
> and have had no problems, but trying even to fsck one of the inner
> partitions on the old drive I get:
> 
> wd1: transfer error, downgrading to Ultra-DMA mode 1
> wd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data transfers)
> wd1f: DMA error reading fsbn 64 of 64-175 (wd1 bn 3912364; cn 4140 tn 1 sn 1), retrying
> wd1: soft error (corrected)
> wd1: transfer error, downgrading to DMA mode 2
> wd1(pciide0:1:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
> wd1g: uncorrectable data error reading fsbn 197456 of 197456-197567 (wd1 bn 4629506; cn 4898 tn 14 sn 14), retrying
> wd1: transfer error, downgrading to PIO mode 4
> wd1(pciide0:1:0): using PIO mode 4
> wd1g: uncorrectable data error reading fsbn 197456 of 197456-197567 (wd1 bn 4629506; cn 4898 tn 14 sn 14), retrying
> wd1g: uncorrectable data error reading fsbn 197456 of 197456-197567 (wd1 bn 4629506; cn 4898 tn 14 sn 14), retrying
> wd1g: uncorrectable data error reading fsbn 197456 of 197456-197567 (wd1 bn 4629506; cn 4898 tn 14 sn 14), retrying
> wd1g: uncorrectable data error reading fsbn 197464 of 197456-197567 (wd1 bn 4629514; cn 4898 tn 14 sn 22), retrying
> wd1g: uncorrectable data error reading fsbn 197464 of 197456-197567 (wd1 bn 4629514; cn 4898 tn 14 sn 22)
> 
> So it looks to me like the drive just happened to fail at the time I
> did the upgrade.

Yes, that must be it :)

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
--