How to fix the Oracle error ORA-15013: diskgroup “string” is already mounted?

In this post, you’ll learn more about the Oracle ErrorORA-15013: diskgroup “string” is already mounted with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15013: diskgroup “string” is already mounted

Reason for the Error ORA-15013: diskgroup “string” is already mounted

An ALTER DISKGROUP MOUNT command specified the name of a diskgroup which is already mounted by the current ASM instance.

How to fix the Error ORA-15013: diskgroup “string” is already mounted ?

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

Check the name of the diskgroup.