On 06/06/2016 03:41 PM, Karan Singh wrote:
#1 : Is r/s and w/s fields in iostat output corresponds to read and write IOPS ? ( https://serverfault.com/questions/342273/disk-iops-count-in-gnu-linux mentions r/s and w/s as IOPS) #2 : If yes then why does they dont match with FIO IOPS results ?
The answer is no, and that goes for any application. You could have an app that does sequential ios in 4k chunks, and the kernel merges them into 512k IOs. From the application perspective, it's doing 128 as many iops as the device is. The converse can also be true, like in your case, since the application is submitting IO that is larger than the device can handle. Hence it's broken up, and the result is that the device is now doing a lot more IOPS than the application is issuing.
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