Performance in Intel IOMeter
Sequential Read & Write Patterns
IOMeter is sending a stream of read and write requests with a request queue depth of 4. The size of the requested data block is changed each minute, so that we could see the dependence of the drive’s sequential read/write speed on the size of the data block. This test is indicative of the highest speed the drive can achieve.
The numeric data can be viewed in tables. We’ll discuss graphs and diagrams. There are two many results, so we divide the graphs of the HDDs in two groups basing on the number of platters (three or four).
Seagate’s new HDDs from the 7200.11 and ES.2 series are in the lead again whereas the Samsung shows a considerably lower speed. The Samsung is worse than the others at processing small data chunks. It is outperformed even by the 5400rpm GP series drives from Western Digital. The latter are not so slow, by the way. They are as fast as the Seagate 7200.10 on large data blocks and close to the leaders of this test on small ones.
It is interesting to compare HDDs from the same generation but different series (desktop and enterprise). For example, the WD Caviar Blue is always a little faster than the RE2. Seagate’s 7200.10 and ES are equals whereas the Seagate 7200.11 has a higher top speed but is worse with small data chunks.
We’ve got the same overall picture at writing. The different behavior of Western Digital’s RE2-GP drives can be noted: the newer WD7501AYPS has sudden performance slumps with 1KB data chunks at reading and with 16KB data chunks at writing. This cannot be attributed to the interaction with the controller’s driver because, as we already know quite well, such driver-provoked slumps can only occur with 4KB data blocks (as indicated by the results of the Seagate Barracuda ES.2, for example).