Articles: Storage
 

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Multithreaded Read & Write Patterns

The multithreaded tests simulate a situation when there are one to four clients accessing the virtual disk at the same time – the clients’ address zones do not overlap. We will discuss diagrams for a request queue of 1 as the most illustrative ones. When the queue is 2 or more requests long, the speed doesn’t depend much on the number of applications. You can also click the following links for the full results:

It is easy to see the trend at multithreaded reading. We’ve got two leaders: Seagate LP and Western Digital RE4-GP. Although the WD AV-GP is claimed to be optimized for multithreaded load, it is nothing but mediocre in this test.

And we must note once again that the current firmware of Samsung’s HDDs cannot identify multithreaded load and slips to random reading mode with consequently poor performance.

Every HDD copes well enough with multithreaded writing. The Samsung and the WD RE4-GP win by a very small margin. The latter seems to make good use of its large cache again because the other three drives from WD have similar and somewhat lower results.

 
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