Site replication and real time fail-over
I need some advice on network design of a multi-site network (high level ). Here's what we need to do:
We will be hosting 24/7 web based transaction processing site(s) that requires high availability. We need to have the ability to failover between sites (data centers) in the event of a network failure, etc..For example if site A hosts money.domain.com and experiences a service interruption, we need a seamless redirection of traffic for money.domain.com to site B (web and data servers at both locations).
This is all new territory for me, but my initial idea would be the following:
Have 2 physical data centers A & B, with large pipe/tunnel between them, which each hosts replicated web servers and clustered SQL boxes. Then use a Cisco Global Site Selector (GSS) network to manage/direct the traffic to site A or B in the event of an outage.
From a high level does this sound feasible? Any suggestions or things to avoid? Any advice is greatly appreciated.
We will be hosting 24/7 web based transaction processing site(s) that requires high availability. We need to have the ability to failover between sites (data centers) in the event of a network failure, etc..For example if site A hosts money.domain.com and experiences a service interruption, we need a seamless redirection of traffic for money.domain.com to site B (web and data servers at both locations).
This is all new territory for me, but my initial idea would be the following:
Have 2 physical data centers A & B, with large pipe/tunnel between them, which each hosts replicated web servers and clustered SQL boxes. Then use a Cisco Global Site Selector (GSS) network to manage/direct the traffic to site A or B in the event of an outage.
From a high level does this sound feasible? Any suggestions or things to avoid? Any advice is greatly appreciated.
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Thanks, guys. This will get me going in the right direction. Much appreciated.
What you want to look into is multi-homing, and BGP.
For the seamless transition you want, it is my understanding that it must happen at the routing layer... essentially, imagine you have two routers with essentially the same configuration, one at each site.
Your ISP's routers know how to route the last hop to your production network. What they need is to know that if that last hop is unavailable, it can be reached at "this other" address instead. "This other address" is of course your DR site.
BGP failover can happen very VERY quickly.
It's probably going to be somewhat expensive, depending on your ISP and their willingness to set something like this up. I know my ISP can do it, for a price.. but it never really was "in the books".