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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
 


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