1. I missed the call on the 11th, so I couldn't ask then, but do hubs host EDVs or do they simply route between agents who host the EDVs?

MWH>> I’ve added a link to the recording next to the transcription: https://hyperonomy.com/2021/03/24/transcription-of-selected-parts-of-the-dif-sds-cs-march-11-2021-zoom-call-hub-and-edv-discussion-featuring-daniel-buchners-description-of-a-hub/  

MWH>> Based on Daniel’s verbal explanation (as well as some developing consensus during the meeting), Hubs are a distinct layer below Agents and above EDVs (as I depicted in the last couple diagrams – the OSI Model and the AHE-ARM).

By implication, I take this to mean that Hubs *do not* host EDVs …Hubs simply access EDVs and their content.  Based on the current specification, EDVs are hosted or attached to EDV service *instances*. 

NOTE: There is potential for confusion if the Hub and EDV service instance are co-located on the same virtual or physical infrastructure – but let’s not let that confuse the conceptual and logical separation of Agents, Hubs, and EDVs.

2. If I'm an agent and I want my EDV to be replicated so it has a better chance of being online, is that the job of other agents, or will a hub also host data?

MWH>> Based *solely on Daniel’s discussion in the call*, Hubs could be responsible for some sort of “syncing” between EDVs.  This can be conceptually true but I also have yet another whitepaper-in-progress (200+ pages of architecture variation discussions) that suggests from a performance perspective, “synching” (aka replication) can be performed at Layer B …controlled by Layer D or above (e.g. by an Agent or Hub).

I also believe in an Agent <> EDV configuration (no Hub), the above comments can be easily adapted by replacing “Hub” with “Agent”.

3. I could imagine a graph of information flow being helpful.  I noticed in the transcript, Orie was attempting to explain the relationships by drawing arrows.

MWH>> I’m hoping the above discussion will suffice for now.  But please let me know if it doesn’t say enough.  I’m also partly hedging until I can get my next whitepaper is completed because the potential EDV services models represent an involved topic/discussion.

4. --Adam

MWH>> Thank you for asking your questions and prompting further discussion.

On Wed, Mar 24, 2021 at 6:40 AM Michael Herman (Trusted Digital Web) <mwherman@...> wrote:

From: Michael Herman (Trusted Digital Web) <mwherman@...>
Sent: March 24, 2021 6:29 AM
To: sds-wg@...; sds-wg@dif.groups.io; Credentials Community Group <public-credentials@...>
Subject: Is there an equivalent to the "OSI Network Stack" but for storage and storage access?