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SubjectRe: Reproducable hard locks in 2.2.17. IDE related
On Fri, 22 Sep 2000, Andries Brouwer wrote:

> On Fri, Sep 22, 2000 at 02:34:16PM +0200, Igmar Palsenberg wrote:
>
> > It could be that it is choking on the fact that one drives is LBA, one
> > drive isn't. Drives are identical, but dmesg gives different CHS for each
> > of them..
>
> A FAQ. See
> http://www.win.tue.nl/~aeb/linux/Large-Disk-14.html#ss14.2
> ("Nonproblem: Identical disks have different geometry?")
>
> Furthermore, it seems there is a misunderstanding here.
> "One drive is LBA, the other isnt" is nonsense.

I meant to say that :)

Normally I don't care, some cases I do (RAID is one of them)

> (There are two access methods to disks, sometimes called CHS and LBA
> access. These days all disks are capable of handling LBA, and Linux
> always uses LBA.
> There are zillions of geometry invention, distortion and translation
> methods, a few thousand of which are called LBA. Such geometry business
> is completely unrelated to Linux disk access.
> You seem to confuse the former LBA with the latter.)
>
> > hda: Maxtor 71626 AP, 1554MB w/128kB Cache, CHS=789/64/63, DMA
> > hdb: Maxtor 91021U2, 9641MB w/512kB Cache, CHS=1229/255/63, (U)DMA
> > hdc: Maxtor 91021U2, 9641MB w/512kB Cache, CHS=19590/16/63, (U)DMA
>
> Here 1.4 MB is wasted on hdb because the BIOS has invented
> this 1229/255/63 translation. The disk access methods on
> hdb and hdc is the same.

Yep. We're trying to put hdb and hdc on the same controller. According to
Andre the VIA bugs with this setup. It isn't hard for me to produce the
lockup (my god, I love 2.5 GB random data :)), so I'll test it when things
are swapped.

> Andries


Igmar

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