Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

ASM Concepts

ASM Disks

• ASM Disk Groups
   

• ASM Files
   

• ASM Templates

Let's explore these concepts in detail. Fig. 5.13 gives a glance of the components in ASM instance and relation with database instance.

Figure 5.12 the Components of the ASM Instance

ASM Disk Groups

A disk group is basically one or more ASM disks that are managed as a single logical unit. Any data-structure stored in an ASM disk group is totally contained within that disk group, or self-contained. A database using ASM disks doesn't have to be shutdown in order for a disk to be added or dropped. ASM rebalances the spread of data to ensure an even I/O load to all disks in a disk group when the disk group configuration changes.

We mentioned that any single ASM file is self-contained in a single ASM disk group. However, an ASM disk group can contain files belonging to several databases, and a single database can use storage from multiple ASM disk groups. You can specify a disk group as the default disk group for files created in a database by specifying the disk group in file destination initialization parameters.

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