[g0del_was_wr0ng]

Yeah it's a bit more complex than that... The disk "IOPS" number on the box doesn't translate 1:1 or even linearly to number of committed durable transactions per second. You should try this with postgres and see how it goes.

[qaq]

If you land me 30K for the hardware I would be glad to do it :). For writing WAL it scales reasonably close to linear