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When starting up your ASM instance, you receive the following error:


What is the cause of the error?
A. The ASM_DISKGROUPS parameter is configured for three disk groups: DGROUP1, DGROUP2, and
DGROUP3.
The underlying disks for these disk groups have apparently been lost.
B. The format of the ASM_DISKGROUPS parameter is incorrect. It should reference the disk group
numbers, not the names of the disk groups
C. The ASM_POWER_LIMIT parameter is incorrectly set to 1. It should be set to the number of disk
groups being attached to the ASM instance.
D. The ASM_DISKSTRING parameter is not set; therefore disk discovery is not possible.
E. There is insufficient information to solve this problem.

　　The ASM_DISKSTRING parameter is not set correctly.When the ASM instance is started,it will 
use the ASM_DISKSTRING to do ASM disk discovery.Correct the ASM_DISKSTRING parameter,and 
restart the instance to correct the problem.

053-531

原文：http://www.cnblogs.com/Babylon/p/7798572.html