Complete I/O starvation with 3ware raid on 2.6

[Aaron Lehmann]

I'm running bkcvs HEAD on a newly installed system, and started
copying files over to my RAID 5 from older IDE disks. When I copy
these files, the system becomes unusable. Specifically, any disk
access on the 3ware array, no matter how simple, even starting 'vi' on
a file, takes minutes or eternity to complete. Suspending the process
doing the copying doesn't even help much, because the LEDs on the card
continue blinking for about 30 seconds after the suspension. This
happens whether the IDE drive is using DMA or not. It seems that some
kind of insane queueing is going on. Are there parameters worth
playing with? Should I try the deadline I/O scheduler?
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