Performance in Intel IOMeter WorkStation Pattern
The work of our hard disk drive under typical workstation load is limited to the maximum of 32 requests. The results were taken for the entire HDD as well as for the first 23GB of the storage space.
The final graph shows that with USB 2.0 interface the performance of the drive starts growing pretty rapidly in the beginning and then reaches the defined maximum getting more or less leveled out.
FireWire interface looks much more preferable in this case. Despite the increase in the queue depth in the beginning, the HDD performs stably fast, which you can see from the horizontal part of the graph. As soon as the queue reaches 8 requests, the drive speeds up quite notably. The two IEEE 1394 controllers perform equally fast, which you can see from the nearly coinciding graphs.
The case when only one 32GB logical partition of the entire HDD is used looks very similar to what we have just seen on the pervious graph. The difference primarily lies in a much higher level of performance, which is caused by the 32GB address space limitation of the work zone. The second peculiarity is a slightly different shape of the graph for USB 2.0 interface, which is nearly horizontal.
When we connect our external HDD via FireWire interface, the requests processing speed turns out higher again. And again the HDD performance boosts when we reach 8 requests queue depth. Both IEEE 1394 controllers are equally efficient here.