redirect and sorry server, new to irules

If you're switching pools or pool members based on URI, make sure to add a OneConnect profile to the virtual server. If you're using SNAT set the OneConnect source mask to 0.0.0.0. If you're not using SNAT, set the source mask to 255.255.255.255. For more info check this wiki page:

http://devcentral.f5.com/wiki/default.aspx/AdvDesignConfig/oneconnect.html

You could also adapt Bhattman's example to cover the edge cases more clearly:

when HTTP_REQUEST {
   if { [active_members pool1] == 0 && [HTTP::uri] starts_with "/login-test"} {
      pool sorry_page_pool
   } else {
      pool Pool1
   }
}

Aaron