You can't make a durable write to disk in 15us. SSDs are around 2 orders of magnitude slower than that. 15us is about right for in memory on two nodes in a sing

You can't make a durable write to disk in 15us. SSDs are around 2 orders of magnitude slower than that. 15us is about right for in memory on two nodes in a single data center though. Most people wouldn't consider that durable though.