Storage Management (ASM ACFS DNFS ODM) (MOSC)

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reset ASM_PREFERRED_READ_FAILURE_GROUPS parameter for a diskgroup

edited Mar 28, 2017 10:52AM in Storage Management (ASM ACFS DNFS ODM) (MOSC) 2 commentsAnswered

I have two questions about ASM_PREFERRED_READ_FAILURE_GROUPS parameter on ASM:

1.What is the default behavior of ASM if we're not setting this parameter on a diskgroup?

The I/O is balanced over multiple failgroups or one of failgroups used for I/O operation?

2. Assume I set this parameter for diskgroup +DATA to "DATA.FG1" with the following command:

ALTER SYSTEM SET ASM_PREFERRED_READ_FAILURE_GROUPS='DATA.FG1' SID='+ASM1' ;

Now I changed my mind and try to disable the preferred read for this diskgroup, the following command comes to mind to reset the operation but it doesn't work:

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