QUESTION 531
When starting up your ASM instance, you receive the following error:

What is the cause of the errZ??http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">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"启动asm实例如下错误">启动ASM实例，如下错误：

原因是
D . ASM_DISKSTRING 参数没有设置，不可能发现磁盘
答案是:D