[l05k]

I would recommend a related paper, "Building an Efficient Key-Value Store in a Flexible Address Space", which focused on the interaction problem between extent-based filesystem and key-value store.

However, in scenarios that really care about performance, memory-mapped files seem to be able to bypass the I/O stack and optimize performance. RocksDB also has corresponding optimizations: https://github.com/facebook/rocksdb/wiki/PlainTable-Format