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Web-Server, File-Server Patterns

The HDDs are tested under loads typical of servers. The names of the patterns are self-explanatory. The results are presented as performance ratings which are calculated as the average speed of an HDD at every load.

The Seagate is an unrivalled leader at both types of load. The Hitachi isn’t very good here because it is equaled by the 5400RPM opponent.

Take note that each graph becomes horizontal from a queue depth of 32 requests. And if you take a look at the Database graphs, you can see that the HDDs all deliver the same performance at the maximum queue depth and at a queue depth of 64 requests. We didn’t benchmark the HDDs at a queue depth of 32 requests in the Database pattern, but we are sure they would deliver the same performance then, too. In other words, all these HDDs seem to support a queue of no longer than 32 requests. This is not a feature of Intel’s new drivers because the WD disk behaves like that on the HPT-RR620 controller, too. So, this must be a specific trait of the whole new generation of HDDs.

Multithreaded Read & Write Patterns

The multithreaded tests simulate a situation when there are one to four clients accessing the hard 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 simultaneously running applications. You can also click the following links for the full results:

This test often produces unpredictable results. This time around, the WD performs superbly whereas the Seagate suffers a catastrophic performance hit. The Hitachi is in between them, taking a 50% performance hit at multithreaded reading.

The Seagate is the only drive to have some problems with multithreaded writing. Depending on the number of data threads, it goes ahead or falls behind the others. So, its performance is rather inconsistent here. We can also note that the 7200RPM Hitachi is no better than the 5400RPM WD when writing multiple data threads.

 
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