Here's a slide from Dormando (memcached maintainer) who spoke recently at QCon SF. He created extstore, which lets you offload values to SSD and keep keys in m

Here's a slide from Dormando (memcached maintainer) who spoke recently at QCon SF. He created extstore, which lets you offload values to SSD and keep keys in memory. With all hits on different types of SSDs, he's seeing near all-DRAM performance in terms of throughput and latency. https://twitter.com/justincormack/status/1059540644245295105 https://twitter.com/justincormack/status/1059540644245295105 The NAND SSD (dark blue line) is still hitting good performance but at ~250K queries per second hits P99 latencies above 1ms (a typical SLA Netflix calls out for their own caching using extstore). The Optane SSD (light blue line) stays well below 1ms P99 latencies up to ~500K queries per second. DRAM alone can handle more throughput but by then you have to take into account what your network can handle.