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Mohamed Farouk
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Hello All
I have a requirement from business that when system is unavailable because of some failures they want any request to our application straight to system unavailable page. how can you do that.
Any quick reply would greatly be appreciated.
Regards
Farouk
 
David O'Meara
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You can place a web server in front and get the web server to serve the message, or you can use a load balancer to hot-swap to another machine, or you could shutdown and start a second dummy instance which just returns the unavailable message.

From places I've worked, the first option is most common.
 
Mohamed Farouk
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Hello David
Thanks for your good advice. One question about the first option is say if you have 4 IIS servers in 4 differnt boxes serving your application, when you have failures you want us to have one additional 1 IIS server in a differnt box in front of these 4 to take over any new request to these server in front?
Please can you confirm your second option of hot swap by the load balancer to another machine, this I think can be done if and only if we have for our application a dummy system no available app installed in a different server
ready to take over.

Please reply
Thanks
Farouk
 
David O'Meara
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It may be easiest to have a hardware load balancer then. The load balancer shares connections between the 4 live servers when the system is up, but redirects all queries to an 'offline server' when the system is down.
 
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