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Raw-disk-throughput
hdparm -tT --direct /dev/<DEVICE>
AIO NVMe Intel Optane 990P
Timing O_DIRECT cached reads: 2423 MB/sec
Timing O_DIRECT disk reads: 2415 MB/sec
SSD SATA SAMSUNG PM863a 960GB
AVG Timing O_DIRECT cached reads: 472 MB/s
AVG Timing O_DIRECT disk reads: 507 MB/s
SSD SATA INTEL 3500 800GB
AVG Timing O_DIRECT cached reads: 350 MB/s
AVG Timing O_DIRECT disk reads: 431 MB/s
HDD SATA HUS726060ALA640 HGST Ultrastar 6TB
AVG Timing O_DIRECT cached reads: 274 MB/s
AVG Timing O_DIRECT disk reads: 180 MB/s
HDD SAS HUS726040ALS214 HGST Ultrastar 4TB
AVG Timing O_DIRECT cached reads: 852 MB/s
AVG Timing O_DIRECT disk reads: 200? MB/s
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