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SubjectRe: /dev/hd[ijkl] only using udma (not udma 100)
On Mon, 27 May 2002, Thunder from the hill wrote:

> Hi,
>
> On Mon, 27 May 2002 me@vger.org wrote:
> > Ive got a machine running debian test dist and 2.4.18. The machine has
> > two promise ata100 tx2 controller cards. My question is why does the
> > devices hde to hdh use udma100 but devices hdi to hdl only use udma.
> > Note on this is that the devices hdi to hdl did i have to make myself
> > (dont know if there is some other configure possibility). All drives are
> > the same model.
>
> Well, you found the /sbin/hdparm solution, which isn't too bad (And
> hopefully you added it to your boot scripts). However, watch that! If the
> mode switches back to lower UDMA modes, it doesn't support the mode
> properly and thus was downgraded.
>

Only thing i get, while i was stresstesting the hardware, is that DMA gets
timeouts time from time and then the DMA gets disabled (logical
realy). But nothing happens with the transfer mode and thats good.


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