Please note that the new /nobackupp17, 18, and 19 filesystems use Progressive File Layout (PFL) to dynamically stripe files to make effective use of solid state disks; therefore, you should not set custom stripe size or stripe counts on them.
For more information, see the following article in the HECC Knowledge Base:
If you have any questions, please contact the Control Room at (800) 331-8737, (650) 604-4444, or support@nas.nasa.gov