Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 






  Oracle Tips by Burleson

10g Grid Computing with RAC
Preparing Shared Storage

Shared Storage

This article will cover preparing shared storage structures. Shared storage is the main and critical requirement for building and managing the RAC database.

Whatever the number of nodes and database instances we may have in the RAC, all of them will have shared access to the underlying storage. Setting up shared storage, creating the hardware level structures, provisioning of the adequate storage redundancy and preparation of host level storage logical storage units are very important. For setting up the needed shared storage structures at the host level for the RAC database, there are more options. These options use shared storage in terms of cluster file system, raw devices and Oracle’s Automated Storage Management (ASM).

 Being a shared architecture, RAC system’s shared storage is a crucial component overall design and well being.

The relational database system is basically a logical entity that stores and retrieves organized data. The database resides in the storage structures and provides a front end for the data’s use. Thus, the database enjoys a very close connection with the storage units. Channels or paths connect the storage units with the servers and server components. The server, being the main abode of the database system, must have many robust features to provide continuous service. As shown in Fig. 5.1, there are multiple layers in the infrastructure. At the core are the storage units. The storage logical units (LUNS) are presented to the server layer and are usually available for use as raw volumes, as mounted (cluster) file systems and as the ASM  (automatic storage management) resources.

Figure 5.1 Storage Units and other system layers

The next layer consists of the server. Even without clustering, the server has to be designed with robust components. There should be a sense of local resiliency. When one of the components falters, there should be a backup or standby component to provide the desired functionality. The cluster layer lies outside the server layer and deals with the loss of the server by failing over to a backup or standby server. Finally, the outside layer is subject to environmental problems such as client connectivity and network failures, which cause bottlenecks between the client and the database.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


Customized Oracle Training Classes

Burleson Consulting offers on-site Oracle courses year-round in a variety of Oracle topics.  All on-site Oracle training can be custom fit to meet your specific training needs.  For customized syllabus development or a price quote, please visit or email

Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.