From a database perspective, 1ms to disk is an eternity.
A good disk subsystem had less write latency than that in the early 90’s.
A good disk subsystem had less write latency than that in the early 90’s.
On the other hand, a single machine has limited reliability. If one wants to have high availability, they needs to dual write to another machine, which also has network latency.
what was the latency to the controller with ram cache?
using seek time as a measure is also somewhat worst case - controllers/filesystems also queue(d) according to drive geometry.