[chaos_emergent]

I believe that NVMe uses multiple I/O queues compared to serialized access with SATA and I think you’d be able to side unnecessary abstractions like file systems and block-based access with an NVMe-specific datastore.

I’m also curious if different and more performant data structures can leveraged; if so, there may be downstream improvements for garbage collection, retrieval, and request parallelism.

[lathiat]

SATA also has multiple I/O queues. It’s called “NCQ”

The exact semantics vary per protocol but it’s a feature of most protocols at least in the currently used revisions: https://en.wikipedia.org/wiki/Native_Command_Queuing

[wtallis]

That's one queue per drive. NVMe allows multiple queues per drive, commonly used to assign one queue per CPU core.

[londons_explore]

Most filesystems will make use of multiple IO queues - ie. if an application sends many different read requests, they may be satisfied out-of-order.