Re: [Sheflug] DMA errors on hda

[Guennadi Liakhovetski <nospam [at] ragingbull.com>]

> > May 28 10:16:56 vetinari kernel: hda: dma_intr: status=0x51 {
> DriveReady SeekComplete Error }
> > May 28 10:16:56 vetinari kernel: hda: dma_intr: error=0x84 {
> DriveStatusError BadCRC }

IIRC, nothing to worry about. Occasional CRC errors under heavy load,
which get fixed automatically by re-reading the same block of information
aren't dangerous. Also, VIA chipset does have a history of problems with
high (66, 100) UDMA. You might want to check Linux kernel mailing list
archives, e.g.
http://www.uwsg.indiana.edu/hypermail/linux/kernel/index.html
Search for UDMA, VIA, CRC, Hedrick:-)

> From Peter, I used to get the same message but for hdc when my
> computer was booting up under RH 7.1 . Boot message repeated this crc 
> error several times but ended with message that it was fixed. How/why I
> can't tell you but it started since putting another hard drive in, I had
> to use a longer than recommended ribbon cable, to reach my second cdrom,
> hdc and then reach the mother board. Prior to this I didn't get the
> message. Have you perhaps got a long ribbon cable? However, I have just
> installed Mandrake 8.0 which seems a bit slower but gives me no crc
> error messages.

To what IDE channel did you connect your second hd? I presume, the first
one is on hda, your second CD is on hdc, where's the 1st one? Yes you need
suitable cable for UDMA, in particular it has to be short. Mandrake might
have a different kernel configuration, which resulted in lower UDMA
values. You can check your current setup with
/sbin/hdparm -I /dev/hdx

HTH
Guennadi
___

Dr. Guennadi V. Liakhovetski
Department of Applied Mathematics
University of Sheffield, U.K.
email: G.Liakhovetski [at] sheffield.ac.uk



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