An Oracle Automatic Storage Management (ASM) failure group allows you to take the redundancy of disks to the next level, by creating a group containing disks from multiple controllers. If a controller fails, and all of the disks associated with that controller are inaccessible, other disks within the disk group will still be accessible as long as they are connected to a different controller.
By creating a failure group within the disk group, Oracle and ASM will mirror writes to different disks and ensure that those writes are to disks within different failure groups so that the loss of a controller will not impact access to your data. If no failure group is specified when creating a disk group, then all disks are placed in their own failure group.
TAbLE 1. Minimum compatible.* Settings for New Features
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