Irule to change VS status

This irule will reject connections if no pool members in the default pool are down, but like Odaah mentioned maybe you could do a redirect to a maintenance page instead of a reject.

when HTTP_REQUEST {

     reject connection if all servers are down in the default pool
    if { [active_members [LB::server pool]] < 1 } {
        reject
    }

    switch -glob [string tolower [HTTP::path]] {
        "/axis/*"   {
         SSL::disable serverside
            pool pool1
        }
        default     {
            pool default_pool
        }
    }
}