On Tue, Mar 19, 2002 at 01:18:51PM +0100, Vincent Bernat wrote:
> Hello !
>
> I have an Abit KR7A-RAID with an embedded HPT372 IDE controller. I
> have put one disk on each controller. These two disks support UDMA
> 5. I can transfer (dd of=/dev/null) at full speed (40 Mb) from the two
> disks at the same time without any problem.
>
> However, when I build the RAID array (software raid 0 with md, not
> with hptraid which works fine but seems to be too slow), I immediatly
> get a DMA error. raidstop does exactly the same thing.
>
> I think there is some tricks in md driver which makes things weird
> since I have absolutely no problem without md driver, even when I
> stress the disks but I get an immediate error when I use md.
>
> Any clue ?
Try stressing *both* drives without using MD.
This sounds like either a driver problem, or a cabling problem.
MD doesn't pull any special IDE tricks - it should not matter at all
whether you do a "dd if=/dev/md0 of=/dev/null" or a
"dd if=/dev/hda of=/dev/null & dd if=/dev/hdc of=/dev/null"
--
................................................................
: jakob@unthought.net : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
