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Oracle Disk I/O Tuning

Chapter 5:

ASM Disk Groups

In case of RAC database environment, files for loading into externals tables are still located on non-ASM file system which can be a cluster file system or local file system.

Types of Disk Groups

There are three types of ASM disk groups:

1.      Normal redundancy

2.      High redundancy

3.      External redundancy

With normal and high redundancy, the disk group template specifies the ASM redundancy attributes for all files in the disk group.

Configuration of ASM high redundancy provides a greater degree of protection. With external redundancy, ASM does not provide any redundancy for the disk group.

In external redundancy, the underlying disks in the disk group must provide redundancy (for example, using a RAID storage array.) The redundancy level or type is specified at the time of creating the disk groups.


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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