Therefore, check the Hard Disk, Ram, Network adapter, etc., and make sure it is the same as the ova template. This is important as the switch-version at the end of the upgrade checks to make sure this hardware is correct. The next step is to verify that the virtual hardware for each of the servers matches the current 12.5 ova templates. At times, even that does not free up enough space, so it is possible to remove some phone firmware for specific devices that the system is not using to free up a little more space. When that is the case, run the ee_common_space_v1.5.cop.sgn file to free up the necessary space. Mostly, there will be disk space issues as this upgrade takes more space than previous upgrades. The cop file checks disk space, NTP, Network connectivity, etc. The filename is ciscocm.preUpgradeCheck-00024 and can be found in the Software Downloads section of Cisco's website. Cisco has a pre-upgrade cop file to run for both CUCM and Unity Connection that will tell you if your server is ready for the upgrade. There are some pre-upgrade tasks that you will want to do to prepare for the upgrade. You will need to put in your Server Type, Model, Processor version, Operating System, OS version. So, if you are on a UCS server you may need to upgrade the firmware, as well as upgrade the VMWare prior to the CUCM upgrade.Ĭisco provides a website to help you determine if your hardware can do this and what firmware you may need. CUCM 12.5 requires VMWare ESXi 6.5 or higher. First, you need to make sure that your hardware is ready for the upgrade. This is a major upgrade and will take about 2.5 hours for the Publisher servers and 1.5 to 2 hours for the subscribers. What the Upgrade Look Likes and How Long it Takes Our suggestion is to take a look at FLEX and what it can do for you. The first item on the list is verifying that the licensing has either been converted to FLEX, which automatically adds the licenses to the Smart License Manager at Cisco, or the CUWL licenses have been converted to the Smart License Manager. Once that decision has been made, having a step-by-step guide that is easy to follow is extremely important. It is definitely worth it, but takes time and can be challenging. Upgrading Cisco Unified Communications Manager (CUCM) to 12.5 can be a difficult decision.
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