ad10: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=11441599

[Mike Tancsa]

At 08:25 PM 08/08/2005, O. Hartmann wrote:
>Hello.
>
>My box is a FreeBSD 6.0-BETA2 driven ASUS A8N-SLI Deluxe based AMD64 boxed 
>(see dmesg).
>One of  my SATA disks, the SAMSUNG SP2004C seems to show errors during 
>operation (and also showd under 5.4-RELEASE-p3).
>Sometimes I get this error:
>ad10: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=11441599
>while the machine still keeps working.
>Other days the box crashes completely.
>
>Is this a operating system bug or is this message an evidence of defective 
>hardware?

You can probably confirm a hardware issue with the smartmon 
tools.  (/usr/ports/sysutils/smartmontools).

It was quite handy the other day for us to narrow down a problem between a 
drive tray and the actual drive.  We started to see

Aug  3 02:02:49 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=391423
Aug  3 02:03:00 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=2304319
Aug  3 02:03:10 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=2312927
Aug  3 02:03:17 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=2308639
Aug  3 02:03:26 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=2309855
Aug  3 02:03:37 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=2348359
Aug  4 12:12:37 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=1528639
Aug  4 12:13:04 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (2 retries 
left) LBA=1530031
Aug  4 12:13:04 verify1 kernel: ad0: TIMEOUT - READ_DMA retrying (1 retry 
left) LBA=1528639
Aug  4 12:13:04 verify1 kernel: ad0: FAILURE - READ_DMA timed out
Aug  4 12:13:04 verify1 kernel: spec_getpages:(ad0s1a) I/O read failure: 
(error=5) bp 0xd630b4fc vp 0xc2640d68

Yet when we read the actual error info off the drive via smartctl -a ad0, 
it was clean.  So it pointed to the drive tray which we swapped and all was 
well.  In other situations however, the smart info will often tell you if 
the drive is starting to fail.  Its not 100% reliable, but since we started 
using it, it generally gave us some sort of heads up as to whether or not a 
drive is in trouble.


         ---Mike