How Vplex functions

vpHow Vplex functions

I have the Snapshot above regarding Vplex.
I would like to know how redundancy works here. Does the VM get replicated  between Storage A and Storage B ?
for instance, if we have VMxyz in storage A and in ESX-01 will this VM be replicated to Storage B and accessed by ESX-03 in case the Datacenter A goes down.

if so then the Vlan on which VMxyz  reside in ESX-01 should exist in ESX-03

Thank you
jskfanAsked:
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andyalderCommented:
The LUN gets replicated with whatever is on it so yes the VMs get replicated. The read-only copies aren't normally mounted but the vLANs still have to be there. You don't have a LAN diagram, just the SAN side there. There's several LAN/WAN diagrams at http://static-void.io/otv-vsp-part1/ that would help understand the network side of it.
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jskfanAuthor Commented:
From the LAN side, they use OTV
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jskfanAuthor Commented:
What I am trying to understand is for instance if you take a look at the Diagram above,
ESXi-01 has  one connection to StorageA and another to StorageB, what is the purpose ?

Also For ESXi-03 to service the same VMs that ESXi-01 was servicing before DataCenterA went down, should it be on the same Vlan as ESXi-01 ?
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andyalderCommented:
The purpose of ESX01 connecting to storage A and Storage B is that it can still run VMs that were on storage A off the read-only copy on B (which is made read-write after storage A fails.) It depends whether the whole DC fails or whether just the storage fails which you would keep active.

The vLANs have to be the same on both sides as far as the VMs are concerned, the rest of the network would have different addresses of course.
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jskfanAuthor Commented:
t depends whether the whole DC fails or whether just the storage fails which you would keep active.

in case the whole DatacenterA fails
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andyalderCommented:
If you were only interested in protecting against whole DC failure then you wouldn't need those cross links.
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jskfanAuthor Commented:
I see what you are saying now:

If StorageA goes down,  ESXi-01 still can use StorageB ( since it is connected to StorageA and StorageB)
If DatacenterA goes down, then  ESX hosts in DatacenterB, needs to be already configured with VLANs similar to ESX hosts in DatacenterA, so that they can  have access to the VMs in StorageB that were mirrored from StorageA
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andyalderCommented:
Yes, it's only a model so each situation may only use part of it. Sometimes the whole infrastructure is replicated, I've been to one bank where there were two identical buildings about a mile apart duplicated right down to the user's desks and canteen so that DC was fully redundant; others the main DC is remote from the users so the networking and routing is completely different on the backup DC.
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jskfanAuthor Commented:
Thank you
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