How to Validate and Fix Proper ASM Failure Group Configuration on Oracle Exadata Database Machine
Last updated on MAY 06, 2015
Applies to:Oracle Exadata Hardware - Version 220.127.116.11 and later
Information in this document applies to any platform.
The goal of this note is to help identify if there is a disk added to the wrong failgroup.
ASM Failure groups are used to place mirrored copies of data so that each copy is on a disk in a different failure group so that the simultaneous failure of all disks in a failure group does not result in data loss. On Exadata Database Machine, by default, all grid disks in a single Exadata Storage Server (or cell) belong to the same failure group to tolerate the failure of a single storage server.
If a single storage server is improperly configured to contain grid disks for a disk group that reside in more than one failure group, then it is possible for the disk group to be taken offline, causing the database to crash, if that single storage server is taken offline (e.g. for planned maintenance) or fails.
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