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Problems w/ RAID-5/sata_promise/PDC20579: msg#00184

Subject: Problems w/ RAID-5/sata_promise/PDC20579
I have a Soltek planar with this controller providing two ports.

As I try to use those ports together with two non-pdc attached sata
drives for software raid, the devices hanging off of the PDC
controller frequently become unresponive, throwing I/O errors on every
attempt to read a sector after a timeout.

Don't have the exact error in front of me, but essentially, it gets
command timeout,
then every command to the controller seems to give the same, status of
0xff busy, but not much more informative output.

The situation seems very similar to Jim Ramsays:
http://www.opensubscriber.com/message/linux-ide@xxxxxxxxxxxxxxx/1671725.html

Output seems to line up pretty much exactly, except specific sector
numbers, of course.
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