Configuration advice

I have four app servers behind BIG-IP.

 

The app owners restart their services whenever the memory on the box rises to a certain threshold value. Because of this BIG-IP marks the server that is restarted down monitored by TCP.

 

The users connected to the server through load balancer gets some RPC failed error.

 

VIP has source address persistence enabled. Action on service down is none.

 

1) When the server is marked down, does persistence entry gets deleted or remains until idle time expires. 2) When the server is marked down, does the connection entry gets deleted or remains until idle time expires.

 

App owners has said that the user/session information is known to all servers.

 

Is there any way I could send those users to any available servers.