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official definition about "Federation" in SimpliVity

 
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J-Philippe
Frequent Advisor

official definition about "Federation" in SimpliVity

Hello to the SVT Community, I'm looking for deep dive explanation or an official definition about "Federation" in SimpliVity. In somes guides 2 Hosts make a federation, in some other docs we speak about federation for host across datacenter (which one ? location or datacenter UO / Folder in a vCenter) https://h20195.www2.hpe.com/v2/getpdf.aspx/a00009003enw.pdf "For example, a modest federation of a few systems contains tens of billions of deduplicated, compressed, and optimized 8 KB elements. The platform enables this federation to track and manage all elements efficiently and makes real-time decisions about which data elements to send via replication and which need not be sent due to the existence of an exact match at the destination site." https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-a00027987en_us&docLocale=en_US "An HPE SimpliVity federation uses at least two HPE OmniStack hosts. HPE OmniStack hosts include HPE OmniStack technology that uses deduplication and compression to efficiently store, manage, and share data. Each HPE OmniStack host also has a dedicated virtual machine called the Virtual Controller. The Virtual Controller runs the HPE OmniStack software." When deploying SVT node we set an SVT_FedPortGroup without routing (regarding preflight kit): "MTU 9000 10 Gbit/s . Communicate with OVC within same Datacenter No gateway/routing between sites Federations subnet of differents sites must be differents Dedicated VLAN is highly recommanded for federation networks on each site" But how can SVT use the Federation between Datacenters (if we talk about geographical location) if there's no routing ? How the OVC can talk each other to decide what KB must be sent or not to the other site ? Or are they speak through the Management Network between site and then pass the information "localy" to other OVC within the cluster through the federation port group ? A clear statement will be welcome about that topic :-) Thanks for your help. Apologize for my english Jean-Philippe
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kmsj13
Occasional Contributor

Re: official definition about "Federation" in SimpliVity

I believe they speak on the management network, I was also wondering on that "Federation" Network, 

JohnHHaines
HPE Pro
Solution

Re: official definition about "Federation" in SimpliVity

It's a simple idea that actually defies a concise explanation.

The SimpliVity Federation is all the SimpliVity systems managed by a common vCenter infrastructure (which could be one or many vCenters), sharing a common authentication domain/source.

So, it could be as small as a single node with a single vCenter. Or it could comprise many clusters across multiple vCenters - but they must be in Linked Mode. If you deploy two nodes into two different vCenters which are NOT in Linked mode, you create two separate Federations.

We prefer to see the product deployed in HA mode, which requires at least two nodes for a cluster, but that is not a technical requirement – you can deploy a single node, that will still create the Federation.

The Federation database is replicated across all nodes in the Federation.

It’s easy to confuse the SimpliVity Federation with the Federation Network ( SVT_FedPortGroup), but they are not at all the same thing.

The Federation Network is used within a cluster for Federation-related traffic between nodes in the cluster. It is logically separated from the cluster Storage traffic, even though they run over the same physical network.

Replication of information between clusters is usually (and assumed to be) over the OVC Management Network (however, if separate clusters can communicate over the Federation Network, they will - but it is not required). This includes both Federation-related information (installation of a new node, for example), and Data (replicating a backup).

The SimpliVity OVC is responsible for replicating Federation Information both within a cluster and between clusters.

I am a HPE Employee
kmsj13
Occasional Contributor

Re: official definition about "Federation" in SimpliVity

If you deploy two nodes into two different vCenters which are NOT in Linked mode, you create two separate Federations.

I would like to clarify on this matter, i understand that in order to create a federation between mulitple vcenters, they must be in linked mode, but is it possible to deploy it in separate vcenter first before joining them on a linked mode? 

JohnHHaines
HPE Pro

Re: official definition about "Federation" in SimpliVity

No. There is no way to "merge" Federations, short or re-deploying the node(s). When you deploy the first node into a vCenter with no exisitng Federation, a new Federation is created, and there is no way to put them together. I think that falls into the category of something we'd like to do, at some point in the future.

But consider - if you want the SVT nodes in the same Federation, that's because you want to leverage single pooint of management, and SimpliVity replication. To do that, you need a network that would support Linked mode vCenters, anyway.

I am a HPE Employee
J-Philippe
Frequent Advisor

Re: official definition about "Federation" in SimpliVity

@JohnHHaines => Thanks so much, the explanation is quite simple know I've read your post. Once again : Merci monsieur Regards, Jean-Philippe