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extremely slow 3w-9xxx

Hi All,

I have a 3ware 9550SX-4LP RAID controller with 4x 300 GB SATA drives
on them in RAID5 config. Furthermore, I installed Debian testing on
LVM (only /boot on a normal partition). I used the ISO from 3Ware to
install: http://www.3ware.com/kb/article.aspx?id=14860 and I am
running their 2.6.8. smp kernel. The machine is a dual Xeon machine, 4
GB RAM. Should be screaming fast.. it is not.

It is extremely slow. Idiotic figures from iostat. Output when I was
moving a couple of tar files (several GB) from one LV to another LV
(or partition if you like):

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
                0.00    0.00    0.25   49.75    0.00   50.00

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda              53.27         0.25         6.03          0         12

Why so much iowaits?
What can I do about this? 6 MB/s is *not* normal I guess...

Thanx in advance for your helpt!


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