AFF, NVMe, EF-Series, and SolidFire Discussions
AFF is FAS system with All SSD Disk in it .
EF is E-Series system with All SSD Disk in it.
both use a different OS too
All Flash FAS uses Clustered Data ONTAP OS
E-Series uses Santricity OS.
Also AFF is unified storage, all protocols NAS and SAN wheras E-Series is for SAN protocols only.