Flash Cache NVMe - does it provide write cache?

[marcinlub]

Hello everyone, 

I has just checking NS0-182 practice exam (https://www.brainshark.com/netapp/NS0-182-PRACTICE link from NetApp webpage) and one of the question was how to configure additional write cache for SAS drives. 
To my surprise the correct answer was to install Flash Cache NVMe module. 

I was thinking Flash Cache is read cache only and Flash Pool provides write cache for overwrites. Did something change recently? Can't find any evidence...

[marcinlub]

[maffo]

FAS9000 platform can use the NVMe drives (installed in slot 6-1 and 6-2, up to 4Tb per drive) as write cache as well.
You can enable it by using the system node external-cache modify command.