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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 maximum speed the drive can achieve.

The numeric data can be viewed in tables. We will be discussing graphs and diagrams.

There is no struggle in the sequential read test. Seagate’s HDDs are a little (by 10 MBps) faster than same-class opponents in terms of top speed and are slightly ahead at lower loads, too. The Hitachi falls behind the others when processing small data blocks. This seems to be due to a low-performance processor rather than to firmware problems: it is no secret that the HDD processor’ performance is the bottleneck when doing sequential reading in small data blocks (by the way, the load on the main CPU is the highest then, too).

We’ve got the same picture at writing as at reading.

 
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