4 ms·

I'm concerned about heat if that little fan goes. I know the storage throttles, but I would imagine 90C+ flash memory is not good for it's long term durability.

I'm concerned about heat if that little fan goes. I know the storage throttles, but I would imagine 90C+ flash memory is not good for it's long term durability. I'd like to see a complete fin heatsink that benefits from case flow.

walrus01 6y ago
I think the fan and enclosure are a bad idea personally, you'd achieve better cooling on the M.2 cards by leaving it off and having a case that has sufficient airflow front to rear in it. And possibly gluing your own small aluminum heatsinks onto the M.2 cards (which are cheap and easy to do), if they don't come with their own heatsinks.
freeqaz 6y ago
It depends. Because NAND flash storage relies on electron tunneling, you actually need high temps for the mechanism to work well. Too much cooling and you'd be increasing the wear levels prematurely. Not sure if this thing is smart enough to know when to kick the fans on and when to keep the temps "high". That is something worth noting though.
- x86_64Ubuntu 6y ago
  Wait! There is commodity hardware that relies on electron tunneling?!
  - LeifCarrotson 6y ago
    Yep. Welcome to the future! https://en.wikipedia.org/wiki/Field_electron_emission#Fowler%E2%80%93Nordheim_tunneling https://en.wikipedia.org/wiki/Field_electron_emission#Fowler...
    - freeqaz 6y ago
      Slightly more specific: https://en.wikipedia.org/wiki/Flash_memory?wprov=sfti1 https://en.wikipedia.org/wiki/Flash_memory?wprov=sfti1 Go to "Writing and erasing". It links to: https://en.wikipedia.org/wiki/Tunnel_injection?wprov=sfti1 https://en.wikipedia.org/wiki/Tunnel_injection?wprov=sfti1
- rasz 6y ago
  There was even technology announced for self healing NAND flash - drives that could cook itself to 800C to heal worn out cells. Never materialized tho :( https://www.extremetech.com/computing/142096-self-healing-self-heating-flash-memory-survives-more-than-100-million-cycles https://www.extremetech.com/computing/142096-self-healing-se... https://hardware.slashdot.org/story/12/12/02/2222235/self-healing-nand-flash-memory-that-can-survive-over-100-million-cycles https://hardware.slashdot.org/story/12/12/02/2222235/self-he... https://ieeexplore.ieee.org/document/7524803 https://ieeexplore.ieee.org/document/7524803
- devwastaken 6y ago
  https://www.eeweb.com/industrial-temperature-and-nand-flash-in-ssd-products/ https://www.eeweb.com/industrial-temperature-and-nand-flash-... I found this here that says lower temperatures are better for storage but higher temperatures are better for writes. I'm not sure how accurate that all is though
tummulfingur 6y ago
The enclosure itself is a giant heatsink [1] so I imagine it is fine if you only run 2 NVMe SSDs in this with a bit of case flow. [1] https://youtu.be/ApXsJkUKDGI?t=341 https://youtu.be/ApXsJkUKDGI?t=341

walrus01 6y ago

I think the fan and enclosure are a bad idea personally, you'd achieve better cooling on the M.2 cards by leaving it off and having a case that has sufficient airflow front to rear in it. And possibly gluing your own small aluminum heatsinks onto the M.2 cards (which are cheap and easy to do), if they don't come with their own heatsinks.

freeqaz 6y ago

It depends. Because NAND flash storage relies on electron tunneling, you actually need high temps for the mechanism to work well. Too much cooling and you'd be increasing the wear levels prematurely. Not sure if this thing is smart enough to know when to kick the fans on and when to keep the temps "high". That is something worth noting though.

x86_64Ubuntu 6y ago
Wait! There is commodity hardware that relies on electron tunneling?!
- LeifCarrotson 6y ago
  Yep. Welcome to the future! https://en.wikipedia.org/wiki/Field_electron_emission#Fowler%E2%80%93Nordheim_tunneling https://en.wikipedia.org/wiki/Field_electron_emission#Fowler...
  - freeqaz 6y ago
    Slightly more specific: https://en.wikipedia.org/wiki/Flash_memory?wprov=sfti1 https://en.wikipedia.org/wiki/Flash_memory?wprov=sfti1 Go to "Writing and erasing". It links to: https://en.wikipedia.org/wiki/Tunnel_injection?wprov=sfti1 https://en.wikipedia.org/wiki/Tunnel_injection?wprov=sfti1
rasz 6y ago
There was even technology announced for self healing NAND flash - drives that could cook itself to 800C to heal worn out cells. Never materialized tho :( https://www.extremetech.com/computing/142096-self-healing-self-heating-flash-memory-survives-more-than-100-million-cycles https://www.extremetech.com/computing/142096-self-healing-se... https://hardware.slashdot.org/story/12/12/02/2222235/self-healing-nand-flash-memory-that-can-survive-over-100-million-cycles https://hardware.slashdot.org/story/12/12/02/2222235/self-he... https://ieeexplore.ieee.org/document/7524803 https://ieeexplore.ieee.org/document/7524803
devwastaken 6y ago
https://www.eeweb.com/industrial-temperature-and-nand-flash-in-ssd-products/ https://www.eeweb.com/industrial-temperature-and-nand-flash-... I found this here that says lower temperatures are better for storage but higher temperatures are better for writes. I'm not sure how accurate that all is though

tummulfingur 6y ago

The enclosure itself is a giant heatsink [1] so I imagine it is fine if you only run 2 NVMe SSDs in this with a bit of case flow. [1] https://youtu.be/ApXsJkUKDGI?t=341 https://youtu.be/ApXsJkUKDGI?t=341