1.13 ASM_PREFERRED_READ_FAILURE_GROUPS

Property	Description
Parameter type	String
Syntax	`ASM_PREFERRED_READ_FAILURE_GROUPS = ‘<diskgroup_name>.<failure_group_name>, ...’`
Default value	NULL
Modifiable	`ALTER SYSTEM`
Modifiable in a PDB	No
Basic	No
Oracle RAC	The value is different on different nodes

ASM_PREFERRED_READ_FAILURE_GROUPS specifies the failure groups that contain preferred read disks. Preferred disks are instance specific. This parameter is only valid in Oracle Automatic Storage Management (Oracle ASM) instances.

To reset the parameter value to null, issue the following statement, which updates the server parameter file (SP file), then reboot Oracle ASM so that the change takes effect:

alter system reset asm_preferred_read_failure_groups;