Re: Problem: Bad blocks on IDE disk
Mark Lord (mlord@pobox.com)
Wed, 16 Dec 1998 10:21:58 -0500
Andrzej Krzysztofowicz wrote:
>
> On Mon, 14 Dec 1998, Mark Lord wrote:
>
> > Andrzej Krzysztofowicz wrote:
> > >
> > > Hi,
> > > Recently a few bad sectors appeared on my IDE disk. And I observed
> > > wrong (in my opinion) behaviour of IDE driver while handling the bad
> > > sectors:
> > >
> > > 1. PIO mode
> > > when multicount is set to non zero value the IDE driver generates
> > > an error even if reading of a bad sector is not directly requested,
> > > but the it is located in the
> > > <block_requested+1>..<block_requested+multicount_value-1>
> > > area.
> >
> > This is not a driver issue, but rather, a filesystem one.
>
> I'm rather sure that this is a driver problem. I tested it doing
..
Read-ahead processing happens *before* handing off
to the low-level (IDE in this case) driver.
The driver doesn't know anything about readahead.
Get it now?
Of course, you could always rework ll_rw_blk.c
to alter that behaviour.
--
mlord@pobox.com
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