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-- External Redundancy / ASM Disk 1G X2 : GRID ¼³Ä¡ °¡´É
-- Normal Redundancy / ASM Disk 1G X3 : GRID ¼³Ä¡ °¡´É [ failure groups À̸§ ¾øÀÌ 3°³ ¶Ç´Â group 3°³ ¸¸µé°í 1°³¾¿ Disk ¼±Åà ]
[INS-30525] Insufficient number of failure groups specified for Normal Redundancy level.
Action For a disk group with Normal redundancy level at least 3 unique failure groups should be configured. https://docs.oracle.com/en/database/oracle/oracle-database/12.2/ostmg/mirroring-diskgroup-redundancy.html#GUID-9AAB5AE7-D819-4CDA-9552-4B41C3383C73
Oracle recommends a minimum of three failure groups for normal redundancy disk groups and five failure groups for high redundancy disk groups to maintain the necessary number of copies of the Partner Status Table (PST) and to ensure robustness with respect to storage hardware failures.