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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:

As usual, the addition of a second read thread affects the HDDs in different ways. The Western Digital slows down less than the others and takes the lead as the consequence. Both drives from Seagate are good at processing two threads whereas the new Samsung M7 is downright poor. This must be a common feature of many new HDDs from Samsung (we have seen the same in our 3.5-inch HDD tests).

The third thread does not change anything while the fourth provokes some changes in the standings. The Western Digital slows down, giving way for both HDDs from Seagate as well as for the Fujitsu. Both drives from Hitachi join the Samsung M7 as the slowest performers in this test.

The Samsung M7 is, on the contrary, the best HDD when writing two threads. Besides it, the Samsung M6, Western Digital and Seagate 7200.4 deliver good performance, too. The new Hitachi 5K500.B is a disappointment. Despite its higher recording density, it is worse than its predecessor at multithreaded writing.

The Hitachi 5K500 and Toshiba join the group of losers when there are even more threads to be written. A small change among the leaders: the Seagate 7200.4 goes ahead and takes first place.

 
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