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ACS 5.1 upgrade to 5.5 question

Hello Experts,

 

I am looking for some kind of process documentation for upgrading ACS 5.1 to 5.5, from Cisco's documention I found that first I have to upgrade 5.3 and then 5.5. I have two production ACS servers with Primary and Secondary. When upgrading to newer version, first I have to start with the secondary server and  de-register and upgrade to 5.3 and 5.5. When the secondary server is upgraded to version 5.5, then upgrade the Primary server and re-register the secondary server on the Primary server. My question is while I am upgrading the secondary and primary servers what will be the impact on the production like downtime and the risk factor, if anybody was on that situation and how did you plan for the upgrade process.

 

Thanks!

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