I have 4 proxies to loadbalance and each proxy have different hardware. I want to use Ratio node along with election hash persistence is it possible?is this what you are looking for?
Ratio based load balancing with CARP persistence
Cache Array Routing Protocol (CARP) Persistence now leverages pool member ratio to enhance traffic distribution to heterogeneous server pools. Administrators can direct more traffic to more capable servers. The pool member's ratio is considered when calculating the hash value in the CARP mode of hash persistence.
Release Note: BIG-IP LTM and TMOS 11.3.0
http://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-11-3-0.html