SQL accounting and users on seperate servers

I'm trying to get a 2 server SQL setup going where all user data is kept
on one system, and the accounting is on another. I have tried several
things (including copying&renaming sql.conf to sqlacct.conf then using
them both... no joy!)

Of course, I could do this with radrelay but that seems to be inefficent
& arguous - is there no way to log directly into one SQL system while
authenticating against another?

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