Disk Response Time
In this test IOMeter is sending a stream of requests to read and write 512-byte data blocks with a request queue of 1 for 10 minutes. The total number of requests processed by the HDD is over 60 thousand, so we get a sustained response time that doesn’t depend on the HDD’s buffer size.
Seagate’s new series HDDs win this test at reading, enjoying a considerable lead over their opponents. The Western Digital WD7500AYPS is expectedly last due to its low spindle rotation speed. Surprisingly, the updated model from the same series has better results at both reading and writing, outperforming some of the 7200rpm models.
The HDDs from Samsung and Hitachi are in the lead at writing, indicating efficient deferred writing algorithms. The old drives from Seagate (7200.10 and ES series) and Western Digital’s RE2 are obviously poor here. Take note that every enterprise model is somewhat worse than the corresponding desktop model at writing: the efficiency of caching algorithms is lowered in them to ensure higher reliability.