Re: Confusing
From the article: "the tidbit that is most likely at the core of MARVIN – VSAN – is the political equivalent of a live wire."
So yes, confusing. And highly, highly political, and you sir have struck to the heart of it. Also remember that EMC has ScaleIO, and Cisco is buying up array vendors. Add in FlexPod, and the fact that other converged competitors (Nutanix, SimpliVity, Maxta, etc) all run on VMware (as at least one of the options) and you get a glimpse of the politics.
Now go beyond storage. Pivotal makes what amounts to wickedawesome orchestration software. In some senses that competes directly with VMware's own offerings in the area. And EMC? Where are they? They can't sell "just storage" for more than another 5-10 years, so they have to have strategic moves beyond the creation of the EMC federation.
EMC federation companies cooperate and compete, even as they own bits of eachother. Nutanix, SimpliVity, Maxta and so forth are official partners of EMC federation companies, as well as vicious competitors.
Dell has launched a tight tie-up with Nutanix, but is also "100% committed to VSAN". Supermicro makes Nutanix's hardware, which Dell will be selling for several months until they get their own nodes done, at which point Nutanix will still sell Supermicro-sourced nodes. Meanwhile, Supermicro looks to be at the core of MARVIN, and has several "VSAN ready nodes" on the VSAN list, as do Dell, HP and so forth.
And what about HP? They have StorSimple and Lefthand and are trying to make a go of all sorts of things. They sell VSAN nodes and VMware, but also crank out 3PAR and are a leading force behind Openstack. They are looking to become a major cloud provider via Openstack.
"Complicated" doesn't even begin to cover it. These companies are big enough to be competing internally. When you start to try to pick out the complex interrelationships even amongst members of allied companies like the EMC federation it gets hard. Try to look at alliances of convenience like VCE and you'll go mad.
Wheeee...this is what I do for a living now! (It's still better than troubleshooting Xerox printers.)