[smartmontools-support] nvme 'Data Units Read' and 'Data Units Written' question.

[Christian Franke]

Robert Fantini wrote:
> attached.
> ...
[NVMe call: opcode=0x02, size=0x0200, nsid=0xffffffff, cdw10=0x007f0002]
[NVMe call succeeded: result=0x00000000
...
20     51 82 3d fe 06 00 00 00  00 00 00 00 00 00 00 00
128-bit LE encoding of 0x6fe3d8251= 30035247697

30     85 4b 3e c7 02 00 00 00  00 00 00 00 00 00 00 00
Same for Data Units Written.
...
Data Units Read:                    30,035,247,697 [15.3 PB]
Data Units Written:                 11,932,683,141 [6.10 PB]


Smartctl prints the counters as reported by the device.

...
Power Cycles:                       9
Power On Hours:                     11,527

Assuming these numbers are all correct, this drive has been used for ~16 
month with an average I/O rate of ~500 MiB/second

$ echo 
'scale=1;((30035247697+11932683141)*512*1000)/11527/3600/1024/1024' | bc
493.8

Regards,
Christian