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I currently have an ASP.NET web app running on a cluster in a data center talking to a SQL Server DB. I need to make this setup redundant with a hot-hot DB in another data center as well as a replicated web cluster.

What architectural options are available to setup this type of fail-over?

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4 Answers 4

Sure, gotcha, I apologize, i'm a bit new here, this is an awesome site!

For the proposed solution I would recommend 3 tiers of redundancy in a multi-threaded setup.

Database- Continue to use SQL in a cluster configuration, 2 nodes with a DRBD RAID10 pair of storage systems to keep the data up and running. In the event of Datacenter failure (worst possible case) have a 3rd tier passive replica at another datacenter with transaction logs being shipped.

Web- 2 Web servers, local data stored on a seperate set of drives RAID1 or RAID10 depending on size and I/O. Replicate data via Robocopy. Added performance and requirement for 100%, incorporate dedicated load balancers in a pair. Additional replica web server at a seperate datacenter.

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it depends on how current you want your data and how much data you will be transfering.

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The idea is to keep two hot-hot SQL Server DB's at different physical locations so that if one goes down there is no interruption in service. Is this even possible? –  Guy Jul 28 '09 at 15:11
    
real time synchronization isn't likely without high expenses, especially if you have a lot of data transferring around. clustered failover servers w/ a quality san and reliable backup routines would be a much easier solution to implement. –  Keith Jul 28 '09 at 21:22

noneil, I think the point of the site is to encourage community problem solving. Lets have some open discussion so other people can benefit from having this question answered here.

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Please keep comments in the comments fields. This has nothing to do with the actual question. –  phuzion Jul 28 '09 at 21:33
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bien, wasnt sure how to add these before. Thanks! –  dubRun Jul 29 '09 at 12:45

I do a lot of work involving these kind of solutions and meeting high levels of redundancy and compliance. I can do you a solid and offer recommendations.

let me know if you want to chat, have a good one.

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I'm looking for community discussion/problem solving on this one. –  Guy Jul 28 '09 at 15:12

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