Dunno if it would work in your case but ... I've had fun mounting a ZFS file system using an entire EFS volume as the "physical" back end. You have to give up o

Dunno if it would work in your case but ... I've had fun mounting a ZFS file system using an entire EFS volume as the "physical" back end. You have to give up on writes actually being on disk when you think they are, but the payback is that's it's really kinda fast.