On Mon, 08 Sep 2014 02:03:47 +0300 Eliezer Croitoru <eliezer@xxxxxxxxxxxx> wrote: > The question is a fundamental for understanding storage and not 100% > about GlusterFS but I fell like it's the right place to ask it. > > I am trying to understand CPU cycles vs IOPS. > Per each IO There must be a number of cycles of the CPU. It's not that much: https://en.wikipedia.org/wiki/Direct_memory_access > So in order to choose the right CPU couple factors are needed to be > right for the task. > For example a standard 7.2k RPS disk have maximum IOPS throughput. > A SSD drive will have twice and more IOPS throughput. Usually at least more than factor 50, usual SATA disk with ~ 150 IOPS, SSDs starting with ~ 7.500 IOPS (until 70k IOPS also in consumer disks and above 100k IOPS in server equipment). > How can I calculate the maximum IOPS per CPU\machine possible? Take a look at the main board and the CPU where the connections between IO (disk, network) and CPU are. They all have a specific bandwith. Additionally you have max IOPS on your local discs, max IOPS on your storage controller. You have to find the bottle neck yourselfs. > There sure to be taken in account the Network traffic IOPS and also > the whole network handling code using up cycles etc. Handling the protocol layer may fill a CPU but TCP-Offloading exists to make that better. What you want to do is to learn system engineering. ;-) Best Regards Oli
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