I am designing a new Cisco ACS rollout. I have 8 servers to work with. I wanted to know if there is any kind of limitation regarding the size of a cluster of servers. Is there any official recommendation? The servers can be geographically dispersed? What should be the WAN delay in order to have the cluster working fine? I have been looking for a good design guide for Cisco ACS 5.2 and couldn't find nothing in the Cisco site. (Apart from the User guide, Installation and upgrade guide, and deployment guide). The Security SRNDs don't have much about ACS.
Can someone point me in the right direction?