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  Oracle Tips by Burleson

Oracle Disk I/O Tuning

Chapter 5:

Configuration of Automated Storage Management

Load balancing (SAME)

Oracle has been promoting the concept of SAME – Stripe and Mirror Everything which aimed at using the full I/O capacity of the all the disks. Many database users have implemented “SAME sets”, each of about 4 mirrored disk pairs. However the SAME functionality does not completely eliminate the disk imbalances. There are different types of files where the IO activity is not uniform, and the configuration of SAME is not the cure for all IO ills.

ASM goes a step forward, in balancing the IO activity. Rebalancing distributes file data evenly across all the disks of the ASM Disk Group. ASM automatically rebalances a disk group whenever disks are added or dropped. ASM ensures that a file is evenly spread across all disks in a disk group when the file is allocated, so rebalancing is not required except when the storage configuration changes. With the I/O balanced whenever files are allocated and whenever the storage configuration changes, you never need to search for hot spots in a disk group and manually move data to restore a balanced I/O load. It also allows the addition of disks online. There are extra background processes that conduct the rebalancing activity in a non-intrusive way.

Thus the ASM makes manual load balancing unnecessary, because the dynamic rebalancing overcomes the major drawback of SAME. When new disks are added to a disk group, rebalancing happens automatically without an outage.

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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