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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.

We can’t expect any surprises in this group of tests. We already know the drives’ top speeds from the low-level read test and writing is usually the same as reading. Still, we should take a look at how the drives process small data blocks. Western Digital’s products improve noticeably, the newer models probably having a faster processor than what the power-efficient Caviar Green has. Interestingly, the RE4 coincides with the Caviar Black at reading but is somewhat slower at writing small blocks of data. We cannot really find a reason for that.

The Hitachi Deskstar 7K2000 is quite a miserable view compared with the others. It either has a very weak processor or poor firmware. Whatever the reason, this drive’s performance with small data blocks is very low. Take note that it achieves its top speed on 64KB blocks only whereas the others do the same on 8KB blocks.

 
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