dbt2 NOTPM numbers

Hi,

I'm currently playing with dbt2 and am wondering, if the results I'm
getting are reasonable. I'm testing a 2x Dual Core Xeon system with 4 GB
of RAM and 8 SATA HDDs attached via Areca RAID Controller w/ battery
backed write cache. Seven of the eight platters are configured as one
RAID6, one spare drive. That should leave five platters for distributing
read only accesses.

The NOTPM numbers I'm getting are suspiciously low, IMO, but maybe I'm
expecting too much. What do you think, is this reasonable or do I have
to twiddle with the configuration somewhat more?

Regards

Markus

Here are my results:

Response Time (s)
Transaction % Average : 90th % Total
Rollbacks %
------------ ----- --------------------- ----------- ---------------
-----
Delivery 3.83 549.046 : 595.280 1212
0 0.00
New Order 45.79 524.659 : 562.016 14494
151 1.05
Order Status 3.98 517.497 : 551.552 1261 0
0.00
Payment 42.50 514.562 : 550.383 13452
0 0.00
Stock Level 3.90 510.610 : 546.957 1236
0 0.00
------------ ----- --------------------- ----------- ---------------
-----

238.39 new-order transactions per minute (NOTPM)
59.5 minute duration
0 total unknown errors
529 second(s) ramping up