I am running the below parameter file to test a zfs volume(4TB).
My understanding is that
It performs 4K, 100% write, 100% random for 60 sec with max iorate possible. Please confirm.
When I repeat the same test, the IOPS values are going down. What could be the reason?
Also what is the kind of write IO Pattern it uses -Is it full random IO, pseudo random IO or Repeating bytes?.How to configure these values. Please let me know.
That is a difficult question to give a straight answer to. With storage subsystems having terabytes of RAM and multiple terabytes of SSD the only way to determine steady state is to just run it and see what happens. That is why the detailed second-by-second reporting done by Vdbench is so important. Once you know how long the warmup takes, you can use the warmup= parameter,