ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=xxx

Ken Smith kensmith at cse.Buffalo.EDU
Thu Sep 30 17:52:31 PDT 2004

On Fri, Oct 01, 2004 at 09:35:15AM +0930, Tristan wrote:

> FreeBSD 6.0-CURRENT with GENERIC kernel built 27th Sep.
> On a SunBlade 100 I see these messages regularly when
> dma is enabled. The messages go away when I either use
> atacontrol to set the mode to PIO4 or set hw.ata.ata_dma to 0
> I do get data corruption on the disk if left in DMA mode.

Just FYI my primary test machine is a SunBlade 100, it seems to
be doing OK with a kernel built from this morning's source.  I've
been doing most of my builds from an NFS server though, I'll do
a check with a full buildworld which will use the local drive more.

> ad0: 14594MB <ST315310A/3.28> [29651/16/63] at ata2-master UDMA66
> acd0: CDRW <LTN486S/YSU1> at ata2-slave PIO4
> ata3-master: DMA limited to UDMA33, non-ATA66 cable or device
> ad1: 39266MB <IBM-DTLA-305040/TW4OA60A> [79780/16/63] at ata3-master UDMA33
> Mounted root from ufs:/dev/ad0a.

Is the data corruption spread across both drives, or just ad1?  That
message about the cable or device being limited could be a clue.

						Ken Smith
- From there to here, from here to      |       kensmith at
  there, funny things are everywhere.   |
                      - Theodore Geisel |

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