We are planning to switch versions of CUCM from 6.1(2) to 6.1(4a)SU2 as an interim upgrade to v7.1(3). The 6.1(4a)SU2 files have been loaded into the inactive partition on all three CUCMs in cluster - all that is left to do is switch versions (PUB first, then two subs. I am just looking to see if there are any gotchas in this upgrade. The 6.1(2) OS doc doesn't go into great detail about the process other than do PUB first and then SUBS - if anybody has any input or info on things to look out for it would be appreaciated - also any idea on the time needed for a 3 CUCM cluster - we are scheduling a late night window to avoid user impact
Thanks for the reply...i have made a few changes that we need to keep since the upgrade file was installed into the inactive partition. Can I put a copy of v6.1(2) into the inactive partition again and do the upgrade to 6.1(4) in one day to avoid this problem?
One thing I sometimes do is upgrade the phone firmware loads on the active system to match the loads on the system that I am installing to the inactive partition. I then reset the phones in a controlled manner to allow them to update the firmware.
This way when I switch CUCM versions the phones just re-register and do not have to go through the entire firmware upgrade process. It saves lots of time and allows me to start my testing earlier. It also makes switching back CUCM versions easier.
I do not always do this with small deployments but, for larger ones with multiple sites, it simplifies things.
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