I am doing a simple migration of CUCM 8.5.1 from MCS to UCS VM's. I know the process of DRS, VM build, restore and relicensing but I was wondering in the case of a simple migration, not upgrade, if there was any preference to doing the subscribers first then the pub of vise versa.
1- Install the VMware on the UCS
2- Then you can easly install the same version 8.5.1 on the UCS
3- Backup from MCS server
4- Restore on UCS
5- Rehost the Licesnes
then you can install your subscribers.
What do you mean with "doing the suberscriber first" ?
As per the following link
Table 4 Cluster Replacement Process Overview
Replace the publisher node.
Replace any dedicated TFTP servers or other non-Cisco Unified Communications Manager cluster nodes.
Replace all backup subscriber nodes.
Replace all primary subscriber nodes.