Mike Tancsa wrote:
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
Dear Mike.
Thanks a lot for this info.
I will use this tool and try to report what I found out.
I also use trays for my drives (like I did with SCSI and SCA2 on our
servers at the lab). Maybe this could be an issue.
Oliver
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