I'm planning to upgrade our CUCM cluster to 7.1.2.(1Pub + 1 Sub). Current version is: 126.96.36.1990.11. Is there a way to upgrade directly to 7.1.2, o r I have to upgrade to 6.1.2 and then to 7.1.2 ? What server should upgrade firstly? Can I upgrade one of them and the other after a week? Any help will be wellcomed.
You will have to do a staggered upgrade to CUCM 7.1.2 as a direct upgrade from CUCM 6.1.1 is not supported.
You will have to upgrade to either CUCM 6.1.2 or to CUCM 7.0.1 and then go to CUCM 7.1.2
You can refer to the following doc for info on upgrade paths.
As for the upgrade process, you should always upgrade the Pub first and then the subscribers.
The way upgrades work in the newer version of CUCM, is that an inactive partition is created when you perform the upgrade. And once the upgrade is done you can switch to the inactive partition. So in your case you can upgrade your servers and wait till all the servers have been upgraded and then switch the versions. Please be very careful that your DB replication is in normal state when you are upgrading and switching the version.
You cannot upgrade directly
Table 4 Supported Cisco Unified Communications Manager Upgrades for Release 7.1(x)
You need to install upgrade on ALL servers, and then restart and switch partitions for both upgrades you need to do. Do not install and then swap one server at a time.
You certainly can install the patches each one week and then swap but any changes made in the meantime will be lost. You need to swap partition on all servers at the same time.
You can refer to the documentation on CCO on how to upgrade CUCM for more details if needed.
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