active/active sites.

GTM would handle that logic nicely in the DNS resolution without worrying about disconnecting clients at the TCP layer.

 

 

Is there reasonably low latency between the datacenters? At the LTM level, if you had both sets of pool members enabled in one pool as described above, LTM would automatically use the remote servers if the local ones were unavailable so no disconnection would be necessary.

 

 

Else, you could take your original approach and define one pool of local servers and one of remote servers. The iRule logic you've described above would be simple using checks on the local pool status. And if the local pool was down you could check the status of the remote pool.

 

 

Aaron