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* CPU is the main bottleneck for Ceph running on good SSDs.
* As Nick Fisk said in his presentation — Ceph is a Software-Defined Storage '''and every piece of Ceph «Software»''' will run faster with every GHz of CPU clock speed.
* Server CPUs often have NUMA (Non-Uniform Memory Access). Which means that some CPU cores don’t have direct access to the RAM and/or to the part of the hardware, but . They must forward requests to other coresin order to access this hardware.
* You should try to use CPUs with more clock speed and without NUMA to maximize the performance. That is, a slower CPU with more cores is probably worse than a faster CPU with a smaller number of cores…
* …but within reason as one Bluestore OSD can eat up to ~6 cores under full load.
