How to relay read and write requests to different ldap servers

[nagamani . chinnapaiyan]

Hi,
 
I am new to ldap. We have 4 ldap servers, 2 of them are in mirror-mode 
providers, 2 of them are just consumers/replicas.
I am working on loadbalancer for these 4 ldap servers using ldap/meta backend.
I want to the ldap proxy/loadbalancer to,
redirect write requests to one of the 2 mirror-mode providers.
redirect read requests to any of the 2 replicas/consumers.
 
I know ldap backend has uri list which can be used to redirect to mirror-mode 
providers. But I want to redirect only the write requests.
 
Regards,
Nagamani Chinnapaiyan