I have been thinking about another tradeoff recently. For lots of rapid access, you want your filesystem to behave like a character device, and to be able to as

I have been thinking about another tradeoff recently. For lots of rapid access, you want your filesystem to behave like a character device, and to be able to async dispatch all operations (including open and close). For fewer accesses to large data selections you want block devices that map to memory (in the process, you lose async options).