You can demand stop one instance in Oracle Rac System. This stop process have to perform step by step. Firstly, stop instance after asm and finally stop applications.
The first step is to stop the Oracle instance. When the instance (and related services) is down, then bring down the ASM instance. Finally, shut down the node applications (Virtual IP, GSD, TNS Listener, and ONS).
Stop Instance
$> su – oracle
$> hostname
Note : Result example : node1
$> crs_stat -t
Note : crs_stat lists process of clusters
$> export ORACLE_SID=orcl1
$> emctl stop dbconsole
$> srvctl stop instance -d orcl -i orcl1
$> srvctl stop asm -n node1
$> srvctl stop nodeapps -n node1
The first step is to start the node applications (Virtual IP, GSD, TNS Listener, and ONS). When the node applications are successfully started, then bring up the ASM instance. Finally, bring up the Oracle instance (and related services) and the Enterprise Manager Database console.
Start Instance
$> su – oracle
$> hostname
Note : Result example : node1
$> crs_stat -t
Note : crs_stat lists process of clusters
$> export ORACLE_SID=orcl1
$> srvctl start nodeapps -n node1
$> srvctl start asm -n node1
$> srvctl start instance -d orcl -i orcl1
$> emctl start dbconsole