[grogers]

One interesting thing for databases is that as nonvolatile storage latency decreases, traditional btrees get more attractive relative to newer log-structured designs. Especially if the write endurance is increased as well over current SSDs.

[wtallis]

Or to put it another way: there's not a lot of reason to have two layers of log-structured storage. Your SSD already needs its own log-structured flash translation layer, and if that's tuned properly for your database workload, then another layer of the same kind of thing may not help much.