At startup, the Oracle ASM instance attempts to mount the following disk groups:
- Disk groups specified in the ASM_DISKGROUPS initialization parameter
- Disk group used by Cluster Synchronization Services (CSS) for voting files
- Disk groups used by Oracle Clusterware for the Oracle Cluster Registry (OCR)
- Disk group used by the Oracle ASM instance to store the ASM server parameter file (SPFILE)
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