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Is this an Exadata? If so HP or Sun? Which O/S version?
Again if Exadata did you blow away RAC and decide to use it as a stand-alone single instance server?
A whole lot of explaining is required before I expect anyone is going to try to give specific advice: I know for sure I won't because what I just read doesn't compute.
yes, it is an Exadata. X2 Quarter Rack with 188.8.131.52 CRS and DB. (Primary and Standby)
I think a little bit abot the whole task.
For me it makes sense to do in the following way.
While we have 4 Data guards an all applying instance are on instance 2 which means on the second db-node
I would like to do the following.
Double check the Apply Mode with dgmgrl
Login as Grid Infrastructure user and stop the whole cluster node
crsctl stop cluster -n hostdb02
Then we can configure on the OS level and afterwards we do the reboot.
Now all resources will be started automatically.
Check as last task if the data guards works fine.