How to enable ArchiveLog mode in Oracle Database RAC Environment?

Steps to enable Archivelog mode in RAC environment:

The following steps need to be taken to enable archive logging in a RAC database environment:

1. Shutdown immediate all database instances
$ srvctl stop database -d <db_unique_name>

2. Startup database in mount mode
$ srvctl start database -d <db_unique_name> -o mount

3. Enable archive logging
$ sqlplus / as sysdba
sql> alter database archivelog;
sql> exit;

4. Stop database
$ srvctl stop database -d <db_unique_name>

5.Start all database instances
$ srvctl start database -d <db_unique_name>

6.Verify archiving is enabled/disabled 
sql> archive log list;