Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

ASM Disk Groups

Note: In any installation, non-ASM managed operating system storage repositories are required, and are used for swap files, execution libraries, and user file systems. The Oracle database and ASM executable files and libraries must reside on the server's operating system file system and cannot reside in an ASM files.

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:

• Normal redundancy
   

• High redundancy
   

• 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.

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