How to stop one node in a two node Oracle RAC Cluster

Introduction

When performing maintenance on our 2 node Oracle Rac Cluster we need to be able to stop 1 node and keep the other node up and running.
Our environment :
2 node Oracle Rac Cluster
    dbnode1 - Red Hat Enterprise Linux Server release 5.5
    dbnode2 - Red Hat Enterprise Linux Server release 5.5
running Oracle 11.2.0.2 and 1 RAC-database PRODDB
     Instance PRODDB1 running on dbnode1
     Instance PRODDB2 running on dbnode2

Steps

• Disable autostart of CRS in order to be able to perform server-maintenance and CRS is not restarted after a reboot of the server (as user root)

root [ /etc/oracle/scls_scr/dbnode2/root ]# . oraenv

ORACLE_SID = [+ASM] ? +ASM2

The Oracle base has been set to /u01/app/oracle

root [ /etc/oracle/scls_scr/dbnode2/root ]# crsctl disable crs

CRS-4621: Oracle High Availability Services autostart is disabled.

You can verify this by checking the file ohasdstr OR performing the command crsctl config crs

root [ ~ ]# cd /etc/oracle/scls_scr/dbnode2/root/
root [ /etc/oracle/scls_scr/dbnode2/root ]# ll
total 12
-rw-r--r-- 1 root root     7 Oct 27  2010 crsstart
-rw-r--r-- 1 root oinstall 8 Jan 30  2014 ohasdrun
-rw-r--r-- 1 root oinstall 7 Oct 27  2010 ohasdstr

root [ /etc/oracle/scls_scr/dbnode2/root ]# more ohasdstr
disable
root [ /etc/oracle/scls_scr/dbnode2/root ]# crsctl config crs
CRS-4621: Oracle High Availability Services autostart is disabled.

• Stop the instance running on dbnode2 (as user oracle)

oracle [ ~ ]$ srvctl stop instance -d PRODDB -i PRODDB2 -o immediate

• Stop CRS on dbnode2. During this command CRS will start several resources (SCAN-Listener, etc) on dbnode1.

root [ ~ ]# . oraenv
ORACLE_SID = [root] ? +ASM2
The Oracle base has been set to /u01/app/oracle
root [ ~ ]# crsctl stop crs
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'dbnode2'
CRS-2673: Attempting to stop 'ora.crsd' on 'dbnode2'
CRS-2790: Starting shutdown of Cluster Ready Services-managed resources on 'dbnode2'
...
CRS-2792: Shutdown of Cluster Ready Services-managed resources on 'dbnode2' has                                                                            completed
...
CRS-2673: Attempting to stop 'ora.gpnpd' on 'dbnode2'
CRS-2677: Stop of 'ora.diskmon' on 'dbnode2' succeeded
CRS-2677: Stop of 'ora.gpnpd' on 'dbnode2' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'db                                                                           node2' has completed
CRS-4133: Oracle High Availability Services has been stopped.

• Now the server can be rebooted