Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

ASM Disks

An ASM disk name is common to all nodes of the cluster. The administrator can specify the disk name, or it will be automatically generated by ASM when a disk is added to a disk group. Since different hosts can use different operating system names to refer to the same ASM disk, the ASM disk name abstraction is required.

To reduce the chances of losing data in case of single disk failure, ASM provides mirroring. If disk mirroring weren't provided, the loss of the unduplicated data from a single ASM disk would possibly damage every file in the disk group.

Failure Groups

Failure groups are manually defined groups of disks sharing a common resource. Failure group definitions determine which ASM disks are used for storing mirror copies of data. Failure groups ensure that data and its redundant copy do not both reside on disks that are likely to fail together.

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