I'm in process of migrating a clients' ACS from 4.2 to 5.4. With 4.2, they have it set up so that two standalone ACS servers (one in US, one in UK) will replicate database and configuration information. They are not configured as a primary/secondary setup.
For instance, any devices in the Data Center in UK will reference the UK ACS server first, US second. In the US, it is the opposite. Any configuration changes are generally made on the US side which then replicates to the UK side.
Is this situation possible in 5.4? I want to avoid users in the UK having to authenticate to the US server and vice-versa unless their local ACS is down.
Hopefully that makes sense. If it doesn't, let me know.