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Disk Response Time

For 10 minutes IOMeter is sending a stream of requests to read and write 512-byte data blocks with a request queue of 1. The total of requests processed by the disk subsystem is over 60 thousand, so we get a sustained response time that doesn’t depend on the amount of cache memory.

It is easy to see that the order of tests in a cycle has no effect on the response time. The same array delivers the same result all the time (by the way, this proves the good repeatability of the statistical method of measuring a disk subsystem’s response). The RAID10 is ahead, of course. The other arrays are somewhat slower than the single HDD but the RAID10 is faster than the latter thanks to the firmware algorithms.

It is the array’s total cache that determines its write response. The larger it is, the lower the response. We must acknowledge that, unlike its predecessor, this controller is as good as the best of its opponents in this test.

 
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