Articles: Storage
 

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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.

We’ve got predictable and close results from five HDDs, among which the Western Digital is the best. The Seagate, the sixth drive, is more than 4 milliseconds worse than the others. This is a considerable gap which is sure to affect the drive’s performance at random operations. This doesn’t look like a quiet operation mode – the heads positioning unit of this drive just seems to be slower than the ones of the other HDDs.

However, the Seagate is even worse at writing. Its write response is just terrible. Some time ago products of this brand used to have such results, too. This actually meant the lack of deferred writing. Could Seagate have returned to this far-from-good trait of its older firmware?

As for the other HDDs, we can note the good results of the Fujitsu and Western Digital. They seem to be doing deferred writing just fine.

 
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