A question about the Intel NVMe SSD P3700 thermal throttling

[idata]

Hi,I have a question about the Intel NVMe SSD P3700 series specification document.

In page number 26, what is the exact meaning of descriptions of Byte 0 and Byte 1-4? (please see the picture below)

Is integer percentage in Byte 0 means the ratio of slow down due to the thermal or something?

What is throttling event count in Bytes 1-4 mean?

I need more clear descriptions for them.

Thanks for your kind support in advance.

Best regards,

Jaemin

[idata]

Hello Jaeminyx,

Thanks for posting in our forum.We would like to work on your request and give you a proper response about this SMART attribute, we will check with one of the disk here and will provide screenshots if possible.Please stand by for an update.Regards,NC

[idata]

Hello Jaeminyx,

According to the bytes meaning, could you please send us a log of the SMART details first? You may need to download the https://downloadcenter.intel.com/download/26221/Intel-SSD-Data-Center-Tool Intel® SSD Data Center Tool, here is the http://www.intel.com/content/dam/support/us/en/documents/solid-state-drives/ssd-software/Intel_SSD_D... User's Guide.The information about these values is being investigated, what we can tell you is that for bytes 1-4 there is a signal that indicates when the drives passes the threshold. We will keep you updated.Regards,NC

[idata]

Here I attached a results from isdct command ("isdct show -smart" on ubuntu machine):

https://drive.google.com/file/d/0BxpwwgcCWPrqR0dvTnVHTE00SVJMdV9VZFFrNVgzY2JBZzhv/view?usp=sharing 0930.tar.gz - Google Drive

You can find two log, one for a whole log file (isdct_whole), one for a log only contains information related to a thermal throttling.

And something I really want to know is related to this graph:

https://www.google.com/url?hl=ko&q=https://docs.google.com/spreadsheets/d/1i6GDeQ1AaT8ZsYELePzacn_AZ... https://www.google.com/url?hl=ko&q=https://docs.google.com/spreadsheets/d/1i6GDeQ1AaT8ZsYELePzacn_AZ...…

I ran some Fio benchmark (bs 4k/qd 16) to see an effect of high temperature on NVMe device (I removed heatsink on the device).

As you can see in the graph, As the temperature goes up, the thermal throttling percentage is also increased. However, the value of kiops seems like same as a result with moderate temperature.

So, I want to know how P3700's thermal throttling works? If it does something to cooling down when a temperature goes up (seems like it does something according to the spec), why the throughput is not affected?

Any information will be helpful for me.

Best regards,

Jaemin

[idata]

Hello Jaeminyx,

Thanks for all the information provided and questions, we will be working on all this and we will get back to you, please expect an update this week.Regards,NC