Best practices for redundant servers

[Graham Beneke]

Dennis Skinner wrote:
 > For serious billable accounting you probably want to write to files and
> then import them into the db (there is a module to help with this).
> Radius will happily skip queries that take too long or if there are not
> enough mysql connections available on the accounting side.
> 

I remember reading about 'radsqlrelay' that does essentially this. It is
also mentioned once in radiusd.conf but subsequent searching has brought
up nothing worthwhile.

Does anyone remember where there is doccumentation on this?

regards
Graham Beneke