Hi, I'm the Social Media manager with Fusion-io. To help clarify, SAP specifies that Fusion-io be used for HANA appliances for logging. Main data processing otherwise occurs “in-memory”.
You can also see a discussion on Fusion-io with SAP Hana at this thread: Re: FusionIO vs. Hana?
If you have other specific questions, you are welcome to send me a direct message.