Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. It was originally developed by the Intel Corporation and announced at the Intel Developers Forum (IDF) on February 17, 1998 – since then it got wide spread within the industry.
Meanwhile Intel has discontinued to work on Iometer and it was given to the Open Source Development Lab (OSDL). In November 2001, a project was registered at SourceForge.net and an initial drop was provided. Since the relaunch in February 2003, the project is driven by an international group of individuals who are continuesly improving, porting and extend the product.
Lots of information to be ingested here, but I’ll give you the short and dirty version — the Raptor is the fastest of the three drives in terms of pure I/O operations per second in all four test cases. Looking at the two 7200 RPM drives though we can see that while the gaps are not as wide, the new SE16 750GB drive definitely has the advantage over the SE 400GB model.
The average transaction time can almost be thought of as the inverse result of the I/O ops per second test and again the WD Raptor X 150GB drive takes the glory here. The two 7200 RPM drives are pretty close in their results here though the new WD7500AAKS does have a slight lead.