Can one rd run two wd's with two different threads for each wd?

Hello Folk’s,

I have a need to create some volumes that are steady (100).

Within the 100 volumes I need to set aside 2 at a time into a WD that allows the IO to go crazy (high BS, latency, IOPS, etc). Besides changing the blocksize,

I thought of changing threads to make it crazier.

Is there a way to define a rd with two different thread counts to achieve this Oracle PL SQL?