If you ust use a smaller system for testing, try to have components identical to the production system, such as operating system level, drivers, and disk types.
When you have less disk space or memory in the test system, scale down databases proportionally, while retaining the same data distributions so optimizer decisions remain constant. Scale down memory to ensure consistent I/O rates.
Reproduce data layout across available devices as closely as possible.
If you use fewer CPUs, adjust transaction arrival rates (that is, load) and concurrent users proportionally.
