Oracle Consulting Oracle Training Oracle Support Development
Oracle Books
SQL Server Books
IT Books
Job Interview Books
Rampant Horse Books
911 Series
Pedagogue Books

Oracle Software
Write for Rampant
Publish with Rampant
Rampant News
Rampant Authors
Rampant Staff
Oracle News
Oracle Forum
Oracle Tips
Articles by our Authors
Press Releases
SQL Server Books

Oracle 11g Books

Oracle tuning

Oracle training

Oracle support

Remote Oracle


Privacy Policy



Oracle Tips by Burleson

Oracle Disk I/O Tuning

Chapter 5: Configuration of CFS or Raw Devices

Cluster Volume Management

The cluster volume manager is a software module that virtualizes the physical storage and presents the usable entities for the applications, such as the database at the operating system level. It is a storage administrator layer at the host level.

The Veritas cluster volume manager (CVM) uses objects for storage management. The two types of objects used by Volume Manager are physical objects and virtual objects.

  • Physical objects – Volume Manager uses two physical objects: physical disks and partitions. Partitions are created on the physical disks (on systems that use partitions).

  • Virtual objects - Volume Manager creates virtual objects, called volumes. Each volume records and retrieves data from one or more physical disks. A volume is a virtual disk device that appears to applications, databases, and file systems as a physical disk. Volumes are also composed of other virtual objects such as ‘sub-disks’ and ‘plexes’. These are used to change volume configuration features such as concatenation, mirroring, and striping. Volumes and their virtual components are called virtual objects.

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

Download your Oracle scripts now:

The definitive Oracle Script collection for every Oracle professional DBA


Linux Oracle commands syntax poster

ION Oracle tuning software

Oracle data dictionary reference poster

Oracle Forum

BC Oracle consulting support training

BC remote Oracle DBA   



 Copyright © 1996 -2017 by Burleson. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation. SQL Server® is the registered trademark of Microsoft Corporation. 
Many of the designations used by computer vendors to distinguish their products are claimed as Trademarks