Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

Types of Disk Groups

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.

ASM Files

As the database requests, ASM will create the required files. ASM assigns each file a fully qualified name ending in a dotted pair of numbers. You can create more user-friendly alias names for the Automated Storage Management filenames by using ASM aliases.

Query the v$osm_alias data dictionary view to see assigned alias names for ASM files. During normal operations, users do not need to be aware of ASM file names. The contents of the v$osm_alias view are shown in Table 5.2.

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