Here’s a dd command to display sequential write throughput from the command line.
time dd if=/dev/zero of=/mounted_backup_volume/zero.raw bs=1M count=512 status=progress |
Output is.
512+0 records in 512+0 records out 536870912 bytes (537 MB) copied, 0.667813 s, 804 MB/s real 0m0.669s user 0m0.000s sys 0m0.359s |