Follow these steps:
Ensure that the ASM administrator is logged into Enterprise Manager and cluster ASM has been already created using ASMCA utilities.
Login to Enterprise Manager and go to Cluster ASM Home page. How?
View cluster level details.
View instance specific events.
View disk group usage for selected ASM Clients or selected disk groups.
View key properties of disk group including mount status.
View key properties of ACFS including mount status.
View key properties of Volumes including mount status.
View Diagnostic incidents for the ASM Cluster.
About Real Application Clusters
Viewing All Targets of a Cluster
Enterprise Manager Information Roadmap
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