How much latency does it affect the service?

[leedm]

sdI looked up other articles and found that it might be affected from 20 μs, is this the value corresponding to total latency? Or is read latency and write latency separate?

This is a nas configuration.

[SpindleNinja]

Can you please clarify the question?      20us is not much latency  espicially  in a NAS environment.