Our customer wants to upgrade their CallManager cluster from 3.2(2c) to 3.3(3). One publisher and one subscriber on MCS 7835s.
I have two questions regarding the upgrading guide documentation:
(1) Why do we have to have two hard drives on the same server when upgrading? For the sake of safety, I want to remove one hard drive to keep the current version of callManager(3.2(2c)), and use only one hard drive for upgrading. Can I do this? Because on lab environment, it is okay. But from the documentation, it is required that the server should have two hard drives when upgrading.
(2) After upgrading the publisher callManager, can I just fresh new install the subscriber instead of according to the guide documentation in case I remember to update the hosts file about the publisher callManager and the subscriber callManager's IP adresses and the hostnames?