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Oracle Disk I/O Tuning

Chapter 5:

ASM Instances

The Oracle Database 10g introduces the ASM instance, a special Oracle instance that manages the disks in disk groups. The ASM instance must be configured and running for the database instance to access Automated Storage Management files

ASM instances are not used to mount databases, they are simply used to coordinate data layout for database instances. However, the database instances do direct I/O to disks in disk groups. I/O doesn't go through the ASM instance.

ASM instances cannot mount a database; they mount disk groups. An ASM instance must be started before a database instance can access files in disk groups. Multiple and separate database instances can share disk groups for their files. On a single node, a single ASM instance typically manages all disk groups. In a Real Application Cluster environment, each node typically has one ASM instance that manages all disk groups for that node in a coordinated manner with the rest of the cluster.


The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases

ISBN

0-9745993-4-4 

by Mike Ault
 


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