How to fix the Oracle error ORA-15411: Failure groups in disk group string have different number of disks.?

In this post, you’ll learn more about the Oracle ErrorORA-15411: Failure groups in disk group string have different number of disks. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15411: Failure groups in disk group string have different number of disks.

Reason for the Error ORA-15411: Failure groups in disk group string have different number of disks.

An attempt was made to enable appliance mode with a different number of disks in each failure group.

How to fix the Error ORA-15411: Failure groups in disk group string have different number of disks. ?

You can fix this error in Oracle by following the below steps

Check if all failure groups have an equal number of disks and try again.