How to fix the Oracle error ORA-15073: diskgroup string is mounted by another ASM instance?

In this post, you’ll learn more about the Oracle ErrorORA-15073: diskgroup string is mounted by another ASM instance with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-15073: diskgroup string is mounted by another ASM instance

Reason for the Error ORA-15073: diskgroup string is mounted by another ASM instance

An attempt was made to drop a diskgroup that is still mounted somewhere in the cluster by another instance.

How to fix the Error ORA-15073: diskgroup string is mounted by another ASM instance ?

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

dismount the diskgroup from all nodes except the one performing the drop diskgroup command.