How to modify Oracle Initialization Parameters in Oracle RAC db

I would like to modify the AUDIT_SYS_OPERATIONS and SQL92_SECURITY parameters to TRUE. I have a two node Oracle RAC db.
Should I stop the clustering services, modify the parameters on both nodes and restart them? Or modify the parameter on one node (node1), restart node1, restart node 1 (no modification)?
ALTER SYSTEM SET AUDIT_SYS_OPERATIONS = TRUE scope=SPFILE;
Thanks.

The command
ALTER SYSTEM SET AUDIT_SYS_OPERATIONS = TRUE scope=SPFILE SID='*' ;is the syntax. However, in RAC using an SPFILE the "SID='*'" specification is the default. IF you want to change a parameter for the local instance (eg PROD1) that you are connected to , specify SID='PROD1' ;
The documentation states that if you specify a remote instance (eg PROD2) Oracle changes the in-memory value on the remote instance.

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>
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How to modify Oracle Initialization Parameters in Oracle RAC db

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