One of the pre-sales team put together this simplified network infrastructure overview of a DR config' that he recently installed at one of our customers.
The diagram shows the logical networks in both office and the DR site. IP addressing provided for illustrative purposes and simplicity of understanding only. In practice certain aspects of IP addressing will have to be changed to fit in with the clients pre-existing international office to office VPN.Failover modes with this config'
In the event of Internet connection failure in the office, the default route for traffic will be via the DR site. Should two shared storage drives fail in one storage device, there is no interruption to service (Raid6). Should one physical Xen server node fail in the office, the other office node can continue running workloads. Should both virtualisation platforms fail or their storage then DR VMs can be accessed at the DR site.
If the entire office fails (both links down because of complete power outage, building on fire or whatever) DR is accessed over the Internet via VPN. Normally, the public Internet Router (or its firewall) provide the default route.
Should the Internet connection fail, the default route is the LAN extension service router. This fail-over routing can be achieved manually or automatically via technologies like HSRP/VRRP.
Hope you find this useful and I'm sure we'll post other snippets and suggestions in future.
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