O. Hartmann wrote:
[ ... ]
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?

Back up any data you care about now. Use the smartmontools port or hunt down a utility from Samsung which'll do a surface test (read only, nondestructive).

You can also run a "dd if=/dev/ad10 of=/dev/null bs=8192" to do a full read test under FreeBSD, and see how many CRC errors show up.

--
-Chuck

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