To start ASMCA, enter asmca at a command prompt inside the Oracle Grid Infrastructure home. For example:
$ asmca
The GUI tool displays and attempts to connect to the Oracle ASM instance identified with the Oracle system identifier (SID) set to +ASM.
If ASMCA detects an Oracle ASM instance that is not running, then ASMCA prompts whether you want to start the instance.
If ASMCA detects an Oracle ASM instance from a previous release, then ASMCA prompts whether you want to upgrade the instance. Oracle recommends that you respond No this prompt.
An Oracle ASM instance should be upgraded with Oracle Universal Installer (OUI). OUI automatically defaults to upgrade mode when it detects an Oracle ASM instance at a previous release level.
To continue the upgrade process with ASMCA, see "Upgrading an Oracle ASM Instance with ASMCA". If you need help with upgrading an Oracle ASM instance, contact Oracle Support Services.
The Instances tab functionality and some menu options of ASMCA are only available in an Oracle RAC configuration.
To start the command-line ASMCA, see "ASMCA Command-Line Interface".