ASM and Databases
Irrespective of the number of databases running on a node, you only require one ASM instance on a node. ASM can support both single instance database and Oracle RAC databases at the same time. ASM is a light weight instance, itsrole is only to manage the metadatainformation and to make the underlying disks accessible for the databases. Oracle databases directly accesses the disks for reading and writing. Oracle database needs to maintain a connection to ASM instance to have metadata information about the storage layout. Without ASM, Oracle database can not directly access any disks that is managed by the ASM.
Irrespective of the number of databases running on a node, you only require one ASM instance on a node. ASM can support both single instance database and Oracle RAC databases at the same time. ASM is a light weight instance, itsrole is only to manage the metadatainformation and to make the underlying disks accessible for the databases. Oracle databases directly accesses the disks for reading and writing. Oracle database needs to maintain a connection to ASM instance to have metadata information about the storage layout. Without ASM, Oracle database can not directly access any disks that is managed by the ASM.
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