I am on CUCM version 9.1.2 ,whenever i add the subscriber /upgrade the subscriber to Cluster  ,all the registered devices drops .Not sure why ,In Cisco Documentation ,it never stated this bug in 9.1.2 service release notes.However , In 9.1.1 mentione...

In Large Deployment, as per SRND 9.X ,the number of Administration & Data Server roles is limited to 3 AW-HDS and 1 HDS-DDS or  AW-HDS-DDS per Logger side. Is it MAX 4 (3 AW-HDS & 1 HDS-DDS) can be deployed for one side of Logger?  If we need more (3...