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  Oracle Tips by Burleson

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



by Mike Ault

Oracle Consulting Services

Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

  • Repairing down production Oracle database systems

  • One-time Oracle tuning evaluation

  • Guru support for your Oracle DBA

  • Installation of Oracle application packages

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