Convert Archivelog Mode to NoArchivelog Mode in RAC

Step 1: Set the Environment Variable
$ hostname
node1
$ export ORACLE_SID=gcprod1
$ sqlplus system @ gcprod1
password:

Step 2: Disable Cluster
SQL> alter system set CLUSTER_DATABASE=FALSE scope=spfile;
system altered

Step 3: Set the parameters (Optional)
SQL> alter system set LOG_ARCHIVE_START= FALSE scope=spfile;
system altered

Step 4: Shutdown the database
SQL> exit
$ srvctl stop database -d gcprod

Step 5: Mount the database

$ echo $ORACLE_SID
gcprod1

$ sqlplus "sys as sysdba"
SQL> startup mount
ORACLE instance started
Total System Global Area: 4.4678E+10 bytes
Fixed Size 2166864 bytes
Variable Size 4345302960 bytes
Database mounted.

Step 6: Disable Archive log
SQL> alter database noarchivelog;

Step 7: Enable the cluster
SQL> alter system set CLUSTER_DATABASE=TRUE scope=spfile;
system altered

Step 8: Shutdown the instance
SQL> shutdown immediate;

Step 9: Start all the instances
$ srvctl start database -d gcprod

Step 10: verify the status.
$ crs_stat -t
all instances must be online

$ sqlplus "sys as sysdba"
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 308
Next log sequence to archive 309
Current log sequence 309

Your database is in No Archive Log Mode.