Aamir Syed gives an example of Diskspd parameters to test a storage subsystem:
It’s important to test your storage performance especially prior to installing or deploying a new SQL Server.
Microsoft has provided us with a great tool called Diskspd, which was meant to replace SQLIO. Diskspd synthetically generates workloads to run against your server. It’s pretty robust and has a lot of parameters so that you can customize your test.
Ex. In the command below, I specified -b8k, which means the block size is going to run at 8k, which is the size that SQL uses for pages.
Click through for a sample run and explanation of each parameter.