Starting and Stopping Oracle Automatic Storage Management
To start and stop Oracle Automatic Storage Management, in addition to using SQL*Plus, you can use the srvctl utility. 
               
To start Oracle Automatic Storage Management instance using the srvctl utility, run the following command:
                  
srvctl start asm
To stop Oracle Automatic Storage Management instance using the srvctl utility, run the following command:
                  
srvctl stop asm
Parent topic: Managing Oracle Automatic Storage Management