irule and source address persistence

Hi Guys,

 

I have these 3 servers (A,B & C) accessing a VIP with one pool of 3 members (1,2 & 3). This VIP has source address persistence and least connections as a LB algorithm. We are experiencing this problem: On a normal situation, we have one path per server pair (A goes to 1, B goes to 2,C goes to 3). When we bring one of the pool members down for maintenance (say, server 3) the new connections are re distributed between the remaining servers (1 & 2). So we have A goes to 1, B and C go to 2 But, when we bring 3 up, it never enters into the LB decision, due to the source address persistence.

 

My question is: can I write an irule that makes the new connections that come from server C start going to server 3 despite the source address persistence? Is there a different way to resolve this?

 

Thanks! Fabian