Hi Subbu
At the end of the day this should be a consideration in your system strategy for GRC solution. If you are using centralised EAM then you must make the GRC system a highly-available system and keep it in the same availability and planned outage window as your ERP.
If you not, consider making it decentralised FF so you can use if for ERP. You will have to look at impacts to scheduling jobs and data collection depending on how long you have an outage.
Should you have an unplanned outage on GRC then you will not be able to use FF. You will need to consider alternative emergency access processes whilst the GRC component is unavailable.
Regards
Colleen