Mainboard (and controllers):
http://en.gentoo-wiki.com/wiki/Asus_M3A32-MVP_Deluxe/WiFi-AP#ATI_Technologies_Inc_SB600_IDE

system:
Linux bvs003 2.6.28-16-server #55-Ubuntu SMP Tue Oct 20 20:37:10 UTC 2009 
x86_64 GNU/Linux

problem still present.

solved some acpi problems (hw related) at boot with:  irqfixup
pci=routeirq acpi_irq_balance noapic iommu=force

continous freezing of md device under operations and really poor performances.
making some tests, with dd and iostat, dd work and say 103-124mb/s (read) and 
iostat at same time show a change from 0 mb/s (read) to 0.06-0.09 mb/s (!!!)

something wrong in messaging?

ahci mod from bios (on 4 disks of 6 enabled #2 controller, recognized
first controller from os) -> same problem

system on 2 hd with ahci disable (the #1 controller, recognised second
form os,  have only raid and ide setting) -> same problem

on heavy copy of data (virtual machines) the system progressively freeze
and system md device and data destination md device  , corrupt the raid.
system crash.

no ahci modules loaded, fresh ubuntu server 9.04 (jaunty) installed and
upgraded to last packages, on 02/11/2009.

ANY SUGGESTIONS?

-- 
ata timeout exception with ahci libata driver (was with 2.6.28-11, but i 
confirmed it affewcts previous kernels too)
https://bugs.launchpad.net/bugs/352197
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