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Oracle Tips by Burleson

Oracle Disk I/O Tuning

Chapter 5: Configuration of CFS or Raw Devices

Volume management involves using physical disks or LUNS to create disk groups. These disks are combined to create volumes with a layout or configuration appropriate to their purpose, for example, mirroring or striping etc. The volumes are flexible objects that can easily be extended or modified. The volume management operations include:

  • Placing the shared disks or LUNS from the shared storage array into the Volume Manager control. When the LUNS are placed under the VM control, they are known as VM disks.

  • Creating the Disk Groups – the disk groups that contain the database application must be available to all nodes in the cluster. A disk group allows disks, volumes, and file systems that are relevant to a single database to be arranged into a logical collection for easy administration.

  • Creating volumes with the appropriate layout (mirror, stripe. etc.) and size from the disk group storage pool. Volumes are flexible objects that can be extended or modified.

  • Making file systems from the volumes and mounting them for database use. Volumes can also be used for database applications, in which case they are referred to as raw devices.

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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