IOMeter - Transaction rate
To compare how TCQ and NCQ scale with SCSI command queuing, I've included scores from a Maxtor Atlas 10K V SCSI drive in our IOMeter results. The FastTrak TX4200 is only validated for loads up to 128 outstanding I/Os and it generated errors in IOMeter with a load of 256 outstanding I/Os.

The DiamondMax 10's IOMeter transaction rates are a little disappointing. With NCQ enabled, the Maxtor drive's performance lags that of the Barracuda 7200.7, especially with the web server test pattern. Without native command queuing, the DiamondMax 10's performance is much slower than the 7200.7.

Of course, none of our 7,200-RPM drives can match the performance of our 10K-RPM Raptors in IOMeter. Also notice how much more aggressively our 10K-RPM SCSI drive's performance ramps as the load increases—that's a mature command queuing implementation in action.