RRM and backup controller

Hi all,
Got a quick question on RRM.Suppose we have 2x5508s where one controller is acts as dedicated backup controller.There is no requirement for L3 roaming and therefore, mobility group feature will be disabled.My understanding is that as mobility group is disabled, there is no other way for the backup controller to obtain RRM specific info from the primary controller. Therefore, I believe we need to configure a separate RF group on each controller  and configure identical RRM settings so when the APs failover, affects on RRM would be minimal.Any advice on recommended way of performing RRM?
Thanks,
J

Hi Bbixe,
Many thanks for the clarification
I got another question,with regards to RRM is there a benefit of monitoring country specific channels ?This is the Cisco default on the WLC.
Woudn't  you be better off to configure monitoring only for DCA  channels?
Thanks,
J

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