For CUCM 8.5 to 8.6 upgrades the most important thing to be aware of is this.
Installing the COP File
Caution For both restricted and unrestricted upgrades from an 8.5(x) or earlier release to an 8.6(x) release, this patch (COP file) must be applied prior to initiating the upgrade. Before you upgrade from compatible versions of Unified CM, install the COP file named ciscocm.refresh_upgrade_v1.0.cop.sgn that you can find under:Cisco Unified Communications Manager Version 8.6>Unified Communications Manager / CallManager / Cisco Unity Connection Utilities>COP-Files
Joe, thanks for this information. I have lab where a Pub has been from 8.0.3 to 8.5.1 to 8.6.2 using the COP, no problem most of the time. However, when deplyoing a new Sub from scratch, I cannot install the COP during upgrade/patch routing in installation. Without that, the 8.6.2 upgrade patch fails during installation and trying to join 8.5.1 to the Pub will not work.
Is there a proper way to do that or should we always use a bootable DVD to re-install or deploy a new 8.6.2?
I had the same problem with joining a new Sub to an 8.6 cluster. I just downloaded the 8.6 upgrade files from CCO and converted them to a bootable DVD. It's not supported by Cisco, but until we start seeing 8.6 bootable disks, there is not a lot of choice. Why they don't just make the downloads bootable puzzles me.
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