As we know in previous editions 1/8 Exadata = 1/4 Exadata by HW.
This means that storage servers had a 12 hard disks and 4 flash cards, but 6 hard disks and 2 flash cards were disabled. But they still were installed in the server.
In the X6-2 we have a new feature from Oracle: "Eighth Rack HC storage servers have half the cores enabled and half the disks and flash cards removed."
This means that X6-2 1/8 contain 6 hard disks and 2 flash cards.
The EF edition has the half flash cards disabled, but installed in the storage server.
This means that storage servers had a 12 hard disks and 4 flash cards, but 6 hard disks and 2 flash cards were disabled. But they still were installed in the server.
In the X6-2 we have a new feature from Oracle: "Eighth Rack HC storage servers have half the cores enabled and half the disks and flash cards removed."
This means that X6-2 1/8 contain 6 hard disks and 2 flash cards.
The EF edition has the half flash cards disabled, but installed in the storage server.