Using acls to check if # connections less than number of up servers

Hey all I'm trying to use Acls to have a priority queue of servers for a special ip/port and fail over to the regular section and i'm wondering if its possible to have an acl that would check if dst_conn gt nbsrv(backend);  the code works fine as it is, but if one server is down in the priority farm then the check to send it to the bigger farm doesn't pass properly as its checking for 3 not 2. Any help would be appreciated. The section of code is copied below showing what i currently have. -Karl

frontend internal_api_rails_farm 192.168.1.2:80

    mode http
    option forwardfor
    acl priority_full dst_conn gt 3
    acl priority_down nbsrv(priority_rails_farm) lt 1     use_backend rails_farm if priority_full or priority_down     default_backend priority_rails_farm

frontend railsfarm 192.168.1.12:80

    mode http
    default_backend rails_farm

backend priority_rails_farm

    mode http
    balance roundrobin
    option httpchk GET /status
    option httpclose
    option abortonclose
    option redispatch
    contimeout 5000
    srvtimeout 5000
    server app02_20 192.168.1.4:6020 maxconn 1 maxqueue 2 check inter 2500 fastinter 1000 downinter 1000 rise 2 fall 2

    server app03_20 192.168.1.5:6020 maxconn 1 maxqueue 2 check inter 2500 fastinter 1000 downinter 1000 rise 2 fall 2

    server app04_20 192.168.1.6:6020 maxconn 1 maxqueue 2 check inter 2500 fastinter 1000 downinter 1000 rise 2 fall 2

backend rails_farm

    mode http
    balance roundrobin
    option httpchk GET /status
    option httpclose
    option abortonclose
    option redispatch
    contimeout 25000
    srvtimeout 25000
    server app01_1 192.168.1.3:6001 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    server app01_2 192.168.1.3:6002 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    server app01_3 192.168.1.3:6003 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    server app01_4 192.168.1.3:6004 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    server app01_5 192.168.1.3:6005 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    server app01_6 192.168.1.3:6006 maxconn 1 maxqueue 2 check inter 5000 fastinter 1000 downinter 1000 rise 2 fall 2

    .......way more server entries Received on 2009/04/07 23:58