Originally posted by: taltamir
besides which, cache always runs out, cache helps with bursts followed by long inactivity, they don't help with anything sustained.
How many 4KB random writes is your program going to issue in 10 seconds?
Entry level raid card with 128MB cache can buffer 32,768 4KB writes.
With a vertex retiring 1,536 4KB writes per second you'd need some silly stupid 4KB write sustained activity to saturate even a low level cached controller to cause stuttering.
I put 2GB in my areca controller because I could, not because I needed to. If I could put 8GB in it I would do it, but probably has no practical value to me as an end user at those levels.