Q,
persistent rebalance refers to a single TCP connection. You can either keep it connected to the same server all the time or break it per http request and rebalance if necessary.
The sticky function refers to multiple tcp connections. Each connection can be sent to the same server or not.
You can use persistent rebalance and sticky at the same time.
It is useful if you have cookie-stickyness and are receiving connection from proxy server.
Since behing the proxy there could be many clients, each using a different cookie, it could be useful to break the single tcp connection from the proxy and reassign it to the appropriate server based on the cookie.
These are http concepts that you can learn from reading the RFC's or books on the subject.
Finally, as a Cisco employe, you could post your questions internally.
Gilles.
