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SubjectRe: libata: dma, io error messages
On Sun, 8 Aug 2004, Eric D. Mudama wrote:

> On Fri, Aug 6 at 11:40, Jeff Garzik wrote:
>> libata does not (yet) retry cable errors, for example. Paul, don't
>> automatically assume the disk is bad, try swapping cables.
>
> In practice with large #s of drives, cable errors are a given, even
> with good cables... eventually *something* is going to glitch, we see
> it all the time in our testing, especially at elevated temperatures.

I can corroborate this using different drivers (3ware in this case) with
12 drivers and 4 backplanes per chassis most of our failures have been due
to disks erroring out on the 3ware rather than actual failed drives. we
pull the disks, test them and return them to the chassis as spares if
they're functional. It doesn't happen that often but we have quite a few
of these things now (~10TB) so it does happen.

> --eric
>
>
>

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Joel Jaeggli Unix Consulting joelja@darkwing.uoregon.edu
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