Messages in this thread | | | Date | Fri, 9 Jul 1999 16:04:33 +0900 (JST) | Subject | Re: Weird data corruption? | From | (Haruhiko Okumura) |
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hahn@coffee.psychology.mcmaster.ca wrote:
> > Meanwhile I encountered another data corruption (mutation of four > > consecutive bytes of a very large file) on my SCSI disk a few days > > ago, and Linux didn't report a CRC error. Is this normal? > > which part? it's not normal to corrupt files. but it can happen > due to disk faults, or to host bugs or faulty host hardware. > if it happened due to errors in transfer, the SCSI parity check > would probably have noticed, and the transfer would be retried > (assuming your scsi has parity enabled. note that parity is a very > weak form of corruption-detection, unlike the checksum used by UDMA.) > I forget whether retries due to detected parity errors are reported > or not. if your host uses ECC dram, then it looks a lot like a > kernel, filesystem or app bug.
My DRAMS are not ECC-enabled. On the other hand I never experienced hangs or kernel oopsen.
Do I have to switch CONFIG_SCSI_CONSTANTS on to get SCSI checksum errors reported?
My experiences of data corruptions are detailed on
http://www.matsusaka-u.ac.jp/~okumura/linux/corruptdata.html
-- Haruhiko Okumura, Ph.D. <okumura@matsusaka-u.ac.jp> Matsusaka University, 1846 Kubo-cho, Matsusaka, 515-8511 Japan Phone: +81-598-29-1122 Fax: +81-598-29-1014 http://www.matsusaka-u.ac.jp/~okumura/
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