For a single lustre client:

dd if=/dev/zero of=deleteme bs=4M count=4096
4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 35.7951 seconds, 480 MB/s
dd if=/dev/zero of=deleteme bs=4M count=4096
4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 36.4098 seconds, 472 MB/s
dd of=/dev/null if=deleteme bs=4M count=4096
4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 56.3618 seconds, 305 MB/s
dd of=/dev/null if=deleteme bs=4M count=4096
4096+0 records in
4096+0 records out
17179869184 bytes (17 GB) copied, 58.2023 seconds, 295 MB/s