I had been trying to find out a way through which i can make on of my acs active & the second one as secondary ie the way in which i can replicate the config done on active one to the back up acs. I m using ACS SE 4.1
Thanks in advance for your suggestions.
Here is the link to set up replication,
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You can use the RDBMS sychronization area to sync the 2 ACS boxes but I don't think there is a way to make one active and the other secondary on the ACS itself.
If you are authenticating users from your switches of wireless etc... You can make the "active" ACS listed first and the "secondary" ACS listed second. This way the secondary ACS would only be used it the active was unavailable.