I'm looking at upgrading our cluster Publisher single subscriber to v6.6, I've had a look over the forums for information on the upgrade and there's quote a few good documents around but nothing conclusive as to what is the best way to upgrade either manually or using the Cluster Upgrade tool.
From a manual perspective it looks reasonably straightforward backup configs and some other details in case of a failure, upgrade Publisher and once back Upgrade Subscriber and during this upgrade there should be no downtime for authenticating wireless users.
Clearpass upgrade tool all done for you once its completed the pre-requisites, I can't find any information on whether this tool is disruptive or not and I've found a few posts with major failures using the upgrade tool.
My gut instict is to go with the manual process as that gives me more control of the upgrade but would be interested in others opnion and how others have completed this upgrade?
Any help or advice would be much appreciated.
Thanks
Jon