I've done some 8.5 upgrades to 9.1 so I'm quite familiar with the refresh upgrade process and the additional server downtime vs. say and 8 to 8.5.
On reading the upgrade guide for CUCM 9.1(1), I stumbled across this line on page 5 -
"You cannot install upgrade software on your node while the system continues to operate."
In the past when doing an Linux to Linux upgrade without a refresh required this certainly wasn't the case. You can't make changes and EM should be turned off but the upgrade was always going on in the background and a switch version was run when complete.
Has this changed?
Can someone chime in who has done a 8.6 to 9.1(x) upgrade on this?
I've got a really tight outage/downtime window to get a cluster upgraded and with 2 servers still on MCS, I don't think I can do it if I can't get a change freeze in place and get the Pub upgraded without taking it down. Having to start and finish the Pub, subs and the physicals in the window might not be possible even with a parallel upgrade.
Just completed and 8.0->9.1 upgrade we did have some device resets but the system was up and functioning. We could not make any changes during this time but dialtone was still there and the only time there was an outage was when the devices bounced from one ccm to another
lBe sure that you have all the devices registered to 1 subscriber including gateways before you start. this will minimize the bouncing of devices during the upgrade. We saw some flakeness when the gateway was registered to 9.1 and the phones were not.
All in all we had about 5 complaints/ during the upgrade and they were all expected.
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