[smartmontools-support] nvme 'Data Units Read' and 'Data Units Written' question.
robertfantini at gmail.com
Sun Jun 30 21:28:24 CEST 2019
So I've done some tests and research .
Wrote a 1GB file, and the data units went up by about 2700. Although I
do not know how the units are calculated , the writes are not under
The incredibly high write count is not unusual for use cases like advanced
scientific testing [ nuclear testing simulations , cloud service providers
Even though 15.3 PB have been written , the drives have a lot more life
left [ 175+ years at our rate of use] :
Endurance Rating Lifetime Writes 62 PBW (JEDEC
Workload), 17 DWPD
So we'll keep this drive.
On Sat, Jun 29, 2019 at 3:00 PM Robert Fantini <robertfantini at gmail.com>
> On Sat, Jun 29, 2019 at 12:37 PM Christian Franke <
> Christian.Franke at t-online.de> wrote:
>> Robert Fantini wrote:
>> > Hello
>> > We just received a used INTEL 2TB Nvme . Below is smartctl output.
>> > These are very high, could the math be incorrect?
>> > Data Units Read: 30,035,247,693 [15.3 PB]
>> > Data Units Written: 11,932,680,343 [6.10 PB]
>> From NVMe specs (same in 1.0 to 1.4):
>> "Data Units Read: Contains the number of 512 byte data units the host
>> has read from the controller... This value is reported in thousands
>> (i.e., a value of 1 corresponds to 1,000 units of 512 bytes read) ..."
>> Math looks good:
>> $ echo 'scale=1; 30035247693 * 512 * 1000 / (1000^5)' | bc
>> To check whether smartctl interprets raw data correctly, please provide
>> output of
>> smartctl -r ioctl,2 -i -A /dev/nvme0
>> as an attachment.
>> > PS: thank you for the great tool.
>> PS: You're welcome.
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