Need help for cache load balancing irule

Hi ,

 

Will need further help on this.

 

The customer has now added a new requirment to the setup.

 

 

As , explained earlier , our client has a group of 5 bluecoat proxies with which the entire country's http traffic is cached and the load balancing is done by a pair of BIGIP'S.

 

 

Now the customer has added two more bluecoats to the setup but these 2 bluecoats will only be used to cache "youtube' traffic.

 

 

The irule that was suggested to me for this purpose was :

 

 

when HTTP_REQUEST {

 

 

if {[string tolower [HTTP::host]] equals "www.youtube.com"} {

 

pool pool1

 

} else {

 

pool pool2

 

}

 

}

 

 

Now apart from it, the customer also wants that in case the pool of "2 bluecoat caches for you tube" fails under any circumstances , the traffic should atleast go to the "original cache of the 5 bluecoats " so that traffic to you tube is not interrupted.

 

 

So , how do i achieve this using an irule. Priority group activation will not work as both the pools are active.

 

 

Any help will be greatly apprecaited.